G2790 M

User Manual: G2790

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MODEL G2790

UNIVERSAL KNIFE GRINDER

OWNER'S MANUAL

(For models manufactured since 04/13)

WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE

OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.

#0346 PRINTED IN TAIWAN

177335

V3.05.17

This manual provides critical safety instructions on the proper setup,

operation, maintenance, and service of this machine/tool. Save this

document, refer to it often, and use it to instruct other operators.

Failure to read, understand and follow the instructions in this manual

may result in fire or serious personal injury—including amputation,

electrocution, or death.

The owner of this machine/tool is solely responsible for its safe use.

This responsibility includes but is not limited to proper installation in

a safe environment, personnel training and usage authorization,

proper inspection and maintenance, manual availability and compre-

hension, application of safety devices, cutting/sanding/grinding tool

integrity, and the usage of personal protective equipment.

The manufacturer will not be held liable for injury or property damage

from negligence, improper training, machine modifications or misuse.

Some dust created by power sanding, sawing, grinding, drilling, and

other construction activities contains chemicals known to the State

of California to cause cancer, birth defects or other reproductive

harm. Some examples of these chemicals are:

• Lead from lead-based paints.

• Crystalline silica from bricks, cement and other masonry products.

• Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you

do this type of work. To reduce your exposure to these chemicals:

Work in a well ventilated area, and work with approved safety equip-

ment, such as those dust masks that are specially designed to filter

out microscopic particles.

INTRODUCTION ............................................................................................................................... 2

Manual Accuracy ........................................................................................................................ 2

Contact Info ................................................................................................................................ 2

Functional Overview ................................................................................................................... 2

Identification ............................................................................................................................... 3

Machine Data Sheet ................................................................................................................... 4

SECTION 1: SAFETY ....................................................................................................................... 6

Safety Instructions for Machinery ............................................................................................... 6

Additional Safety for Universal Knife Grinders ........................................................................... 8

SECTION 2: POWER SUPPLY ........................................................................................................ 9

SECTION 3: SETUP ....................................................................................................................... 11

Needed for Setup ..................................................................................................................... 11

Unpacking ................................................................................................................................ 11

Inventory ................................................................................................................................... 12

Cleanup .................................................................................................................................... 13

Site Considerations .................................................................................................................. 13

Mounting ................................................................................................................................... 14

Assembly .................................................................................................................................. 15

Test Run ................................................................................................................................... 16

SECTION 4: OPERATIONS ........................................................................................................... 17

Grinding Tips ............................................................................................................................ 17

Wheel Selection ....................................................................................................................... 18

Wheel Care .............................................................................................................................. 18

Wheel Inspection & Ring Test .................................................................................................. 19

Mounting Pivot Support ............................................................................................................ 19

Sharpening Narrow Tools ........................................................................................................ 20

Sharpening Wide Knives .......................................................................................................... 20

SECTION 5: ACCESSORIES ......................................................................................................... 24

SECTION 6: MAINTENANCE......................................................................................................... 26

Schedule .................................................................................................................................. 26

Cleaning ................................................................................................................................... 26

Lubrication ................................................................................................................................ 26

Wheel Dressing ........................................................................................................................ 27

Wheel Replacement ................................................................................................................. 28

SECTION 7: SERVICE ................................................................................................................... 29

Troubleshooting ........................................................................................................................ 29

SECTION 8: WIRING ...................................................................................................................... 31

Wiring Safety Instructions ........................................................................................................ 31

Wiring Diagram......................................................................................................................... 32

SECTION 9: PARTS ....................................................................................................................... 33

Parts Breakdown ...................................................................................................................... 33

Parts List .................................................................................................................................. 34

WARRANTY AND RETURNS ........................................................................................................ 37

Table of Contents

-2- Model G2790 (Mfd. Since 04/13)

INTRODUCTION

Functional Overview

The Model G2790 is a dry grinder and is not

designed to be used with cutting fluids.

This grinder is designed to sharpen cutting tools

up to 20" long, such as chisels with a straight

edge or jointer/planer knives, that can be securely

mounted in one of the two clamping systems. The

cutting tool can be positioned at angles from 15°

to 90° to the grinding wheel.

Refer to Figures 1–2 for examples of typical

grinding setups.

Figure 1. Example of a grinding setup for a

chisel.

Figure 2. Example of grinding setup for jointer

knife (shown without adjustable guard for clarity).

Manual Accuracy

We are proud to offer this document with your

new machine! We've made every effort to be

exact with the instructions, specifications, draw-

ings, and photographs of the machine we used

when writing this manual. However, sometimes

we still make an occasional mistake.

Also, owing to our policy of continuous improve-

ment, your machine may not exactly match

the manual

. If you find this to be the case, and

the difference between the manual and machine

leaves you in doubt, immediately call our techni-

cal support for updates or clarification.

For your convenience, we post all available docu-

mentation on our website at

www.grizzly.com

Any updates to this document will be reflected on

our website as soon as complete.

Contact Info

We stand behind our machines! If you have ques-

tions or need help, contact us with the information

below. Before contacting, make sure you get the

serial number

and manufacture date

from the

machine ID label. This will help us help you faster.

Grizzly Technical Support

1815 W. Battlefield

Springfield, MO 65807

Phone: (570) 546-9663

Email: techsupport@grizzly.com

We want your feedback on this manual. What did

you like about it? Where could it be improved?

Please take a few minutes to give us feedback.

Grizzly Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Email: manuals@grizzly.com

Model G2790 (Mfd. Since 04/13) -3-

Identification

Figure 3. Model G2790 identification.

Knife

Clamp

Knob

Knife

Clamp

Wheel

Guard

Table

Handwheel

Table

Grinding

Wheel

Slide

Table

Mounting

Hole

Pivot Support

Adjustment Knob

Table

Lock

Pivot

Support

Knife

Adjustment

Knob

ON/OFF

Switch

Slide

Bar

To reduce your risk of

serious injury, read this

entire manual BEFORE

using machine.

Adjustable Guard

-4- Model G2790 (Mfd. Since 04/13)

Machine Data Sheet

Page 1 of 2 Model G2790

MODEL G2790

UNIVERSAL KNIFE GRINDER

Product Dimensions:

Weight ............................................................................................................................................................................. 45 lbs.

Length/Width/Height .......................................................................................................................................24" x 11

1⁄2" x 13"

Foot Print (Length/Width) .............................................................................................................................................. 9" Circle

Shipping Dimensions:

Type ...........................................................................................................................................................................Cardboard

Content .......................................................................................................................................................................... Machine

Weight .............................................................................................................................................................................. 59 lbs.

Box 1 Length/Width/Height .................................................................................................................................20" x 13" x 13"

Box 2 Length/Width/Height .....................................................................................................................................26" x 5" x 3"

Electrical:

Switch ................................................................................................................................................................ ON/OFF Toggle

Switch Voltage ................................................................................................................................................................... 110V

Cord Length ..........................................................................................................................................................................4 ft.

Cord Gauge .................................................................................................................................................................18 gauge

Minimum Circuit Requirement .............................................................................................................................................. 15A

Included Plug ........................................................................................................................................................... NEMA 5-15

Motor:

Type ......................................................................................................................................... TEFC Capacitor Start Induction

Horsepower ........................................................................................................................................................................1⁄2 HP

Voltage ............................................................................................................................................................................... 110V

Phase ................................................................................................................................................................................Single

Amps ...................................................................................................................................................................................... 3A

Speed .........................................................................................................................................................................3500 RPM

Cycle ................................................................................................................................................................................. 60 Hz

Power Transfer ........................................................................................................................................................Direct Drive

Bearings ............................................................................................................................... Shielded and Permanently Sealed

Model G2790 (Mfd. Since 04/13) -5-

Model G2790Page 2 of 2

Capacities

Maximum Blade Length ........................................................................................................................................................ 20"

Table Tilt ......................................................................................................................................................................20° – 70°

Grinding Wheel Specifications:

Type .................................................................................................................................................................................Type 5

Diameter .................................................................................................................................................................................. 6"

Thickness ............................................................................................................................................................................. 1

1⁄2"

Bore .........................................................................................................................................................................................1⁄2"

Construction:

Base ............................................................................................................................................................................. Cast Iron

Table ............................................................................................................................................................................ Cast Iron

Other Specifications:

Country of Origin ............................................................................................................................................................. Taiwan

Warranty ........................................................................................................................................................................... 1 Year

Serial Number Location ................................................................................................................... ID Label on Front of Motor

Approximate Assembly/Setup Time .......................................................................................................................... 15 Minutes

Features:

Knife Holder Adjusts From 20° – 70°

120 Grit Aluminum Oxide Grinding Stone Raises and Lowers

-6- Model G2790 (Mfd. Since 04/13)

ELECTRICAL EQUIPMENT INJURY RISKS. You

can be shocked, burned, or killed by touching live

electrical components or improperly grounded

machinery. To reduce this risk, only allow qualified

service personnel to do electrical installation or

repair work, and always disconnect power before

accessing or exposing electrical equipment.

DISCONNECT POWER FIRST.

Always discon-

nect machine from power supply BEFORE making

adjustments, changing tooling, or servicing machine.

This prevents an injury risk from unintended startup

or contact with live electrical components.

EYE PROTECTION. Always wear ANSI-approved

safety glasses or a face shield when operating or

observing machinery to reduce the risk of eye

injury or blindness from flying particles. Everyday

eyeglasses are NOT approved safety glasses.

OWNER’S MANUAL. Read and understand this

owner’s manual BEFORE using machine.

TRAINED OPERATORS ONLY. Untrained oper-

ators have a higher risk of being hurt or killed.

Only allow trained/supervised people to use this

machine. When machine is not being used, dis-

connect power, remove switch keys, or lock-out

machine to prevent unauthorized use—especially

around children. Make your workshop kid proof!

DANGEROUS ENVIRONMENTS. Do not use

machinery in areas that are wet, cluttered, or have

poor lighting. Operating machinery in these areas

greatly increases the risk of accidents and injury.

MENTAL ALERTNESS REQUIRED. Full mental

alertness is required for safe operation of machin-

ery. Never operate under the influence of drugs or

alcohol, when tired, or when distracted.

For Your Own Safety, Read Instruction

Manual Before Operating This Machine

The purpose of safety symbols is to attract your attention to possible hazardous conditions.

This manual uses a series of symbols and signal words intended to convey the level of impor-

tance of the safety messages. The progression of symbols is described below. Remember that

safety messages by themselves do not eliminate danger and are not a substitute for proper

accident prevention measures. Always use common sense and good judgment.

Indicates a potentially hazardous situation which, if not avoided,

MAY result in minor or moderate injury. It may also be used to alert

against unsafe practices.

Indicates a potentially hazardous situation which, if not avoided,

COULD result in death or serious injury.

Indicates an imminently hazardous situation which, if not avoided,

WILL result in death or serious injury.

This symbol is used to alert the user to useful information about

proper operation of the machine.

NOTICE

Safety Instructions for Machinery

SECTION 1: SAFETY

Model G2790 (Mfd. Since 04/13) -7-

WEARING PROPER APPAREL. Do not wear

clothing, apparel or jewelry that can become

entangled in moving parts. Always tie back or

cover long hair. Wear non-slip footwear to reduce

risk of slipping and losing control or accidentally

contacting cutting tool or moving parts.

HAZARDOUS DUST. Dust created by machinery

operations may cause cancer, birth defects, or

long-term respiratory damage. Be aware of dust

hazards associated with each workpiece mate-

rial. Always wear a NIOSH-approved respirator to

reduce your risk.

HEARING PROTECTION. Always wear hear-

ing protection when operating or observing loud

machinery. Extended exposure to this noise

without hearing protection can cause permanent

hearing loss.

REMOVE ADJUSTING TOOLS. Tools left on

machinery can become dangerous projectiles

upon startup. Never leave chuck keys, wrenches,

or any other tools on machine. Always verify

removal before starting!

USE CORRECT TOOL FOR THE JOB. Only use

this tool for its intended purpose—do not force

it or an attachment to do a job for which it was

not designed. Never make unapproved modifica-

tions—modifying tool or using it differently than

intended may result in malfunction or mechanical

failure that can lead to personal injury or death!

AWKWARD POSITIONS. Keep proper footing

and balance at all times when operating machine.

Do not overreach! Avoid awkward hand positions

that make workpiece control difficult or increase

the risk of accidental injury.

CHILDREN & BYSTANDERS. Keep children and

bystanders at a safe distance from the work area.

Stop using machine if they become a distraction.

GUARDS & COVERS. Guards and covers reduce

accidental contact with moving parts or flying

debris. Make sure they are properly installed,

undamaged, and working correctly BEFORE

operating machine.

FORCING MACHINERY. Do not force machine.

It will do the job safer and better at the rate for

which it was designed.

NEVER STAND ON MACHINE. Serious injury

may occur if machine is tipped or if the cutting

tool is unintentionally contacted.

STABLE MACHINE. Unexpected movement dur-

ing operation greatly increases risk of injury or

loss of control. Before starting, verify machine is

stable and mobile base (if used) is locked.

USE RECOMMENDED ACCESSORIES. Consult

this owner’s manual or the manufacturer for rec-

ommended accessories. Using improper acces-

sories will increase the risk of serious injury.

UNATTENDED OPERATION. To reduce the

risk of accidental injury, turn machine OFF and

ensure all moving parts completely stop before

walking away. Never leave machine running

while unattended.

MAINTAIN WITH CARE. Follow all maintenance

instructions and lubrication schedules to keep

machine in good working condition. A machine

that is improperly maintained could malfunction,

leading to serious personal injury or death.

DAMAGED PARTS. Regularly inspect machine

for damaged, loose, or mis-adjusted parts—or

any condition that could affect safe operation.

Immediately repair/replace BEFORE operating

machine. For your own safety, DO NOT operate

machine with damaged parts!

MAINTAIN POWER CORDS. When disconnect-

ing cord-connected machines from power, grab

and pull the plug—NOT the cord. Pulling the cord

may damage the wires inside. Do not handle

cord/plug with wet hands. Avoid cord damage by

keeping it away from heated surfaces, high traffic

areas, harsh chemicals, and wet/damp locations.

EXPERIENCING DIFFICULTIES. If at any time

you experience difficulties performing the intend-

ed operation, stop using the machine! Contact our

Technical Support at (570) 546-9663.

-8- Model G2790 (Mfd. Since 04/13)

Additional Safety for Universal Knife Grinders

Serious injury or death can occur from impact injuries. Rotating grinding wheels can easily

remove skin, or entanglement/amputation injuries can occur from being caught in moving

parts or in-running pinch points. Flying sparks can ignite explosive or flammable materials. To

minimize risk of getting hurt or killed, anyone operating machine MUST completely heed hazards

and warnings below.

EYE PROTECTION. Grinding causes small par-

ticles to become airborne at a high rate of speed.

ALWAYS wear safety glasses or face shield when

using this machine.

MOUNTING TO WORKBENCH. An unsecured

grinder may become dangerously out of con-

trol during operation. Make sure the grinder is

FIRMLY secured to the workbench.

WHEEL SPEED RATING. Wheels operated at a

faster speed than they are rated for may fly apart

during use. Before mounting a new wheel, be sure

the wheel RPM rating is equal to or higher than

the speed of the grinder—3500 RPM.

WHEEL FLANGES. When mounting wheels only

use the wheel flanges that are included with this

grinder. Other flanges may not properly secure

the wheel and will increase the risk of the wheel

flying apart during operation.

WHEEL INSPECTION. Visually inspect the wheel

and perform the “ring test” before installation to

ensure that it is safe to use. A wheel that does

not pass the ring test may fly apart during opera-

tion—DO NOT use it!

DRY GRINDING. This grinder is not designed to

work with cutting fluids. DO NOT use cutting flu-

ids, and keep all liquids away from the grinder to

reduce the risk of electrocution.

STARTING GRINDER. If a grinding wheel is

damaged, it will usually fly apart shortly after start-

up. Never start the grinder with the wheel above

the surface of the grinder table. Stand clear of the

grinder after starting it and wait for at least one

minute before standing in front of it.

LUNG PROTECTION. Grinding produces hazard-

ous dust, which may cause long-term respiratory

problems if breathed. ALWAYS wear a NIOSH-

approved dust mask or respirator when grinding.

HAND/WHEEL CONTACT. Grinding wheels have

the capability of removing a lot of skin quickly.

Keep a firm grip on the tool or slide bar and posi-

tion your hands at a safe distance away from the

wheel when grinding. Do not wear gloves when

grinding as they may get caught in the wheel and

cause serious entanglement injuries.

GUARDS & SUPPORTS. Always keep the wheel

guard secured in place when operating the grind-

er. Always keep the cutting tool firmly clamped

before starting the machine. Correctly position

and lock the pivot support before turning the

grinder ON.

EXPERIENCING DIFFICULTIES. If at any time

you are experiencing difficulties performing the

intended operation, stop using the machine and

contact Tech Support at (570) 546-9663.

Model G2790 (Mfd. Since 04/13) -9-

SECTION 2: POWER SUPPLY

Availability

Before installing the machine, consider the avail-

ability and proximity of the required power supply

circuit. If an existing circuit does not meet the

requirements for this machine, a new circuit must

be installed. To minimize the risk of electrocution,

fire, or equipment damage, installation work and

electrical wiring must be done by an electrician or

qualified service personnel in accordance with all

applicable codes and standards.

Electrocution, fire, shock,

or equipment damage

may occur if machine is

not properly grounded

and connected to power

supply.

Full-Load Current Rating

The full-load current rating is the amperage a

machine draws at 100% of the rated output power.

On machines with multiple motors, this is the

amperage drawn by the largest motor or sum of all

motors and electrical devices that might operate

at one time during normal operations.

Full-Load Current Rating at 110V .................3A

The full-load current is not the maximum amount

of amps that the machine will draw. If the machine

is overloaded, it will draw additional amps beyond

the full-load rating.

If the machine is overloaded for a sufficient length

of time, damage, overheating, or fire may result—

especially if connected to an undersized circuit.

To reduce the risk of these hazards, avoid over-

loading the machine during operation and make

sure it is connected to a power supply circuit that

meets the specified circuit requirements.

For your own safety and protection of

property, consult an electrician if you are

unsure about wiring practices or electrical

codes in your area.

Note: Circuit requirements in this manual apply to

a dedicated circuit—where only one machine will

be running on the circuit at a time. If machine will

be connected to a shared circuit where multiple

machines may be running at the same time, con-

sult an electrician or qualified service personnel to

ensure circuit is properly sized for safe operation.

A power supply circuit includes all electrical

equipment between the breaker box or fuse panel

in the building and the machine. The power sup-

ply circuit used for this machine must be sized to

safely handle the full-load current drawn from the

machine for an extended period of time. (If this

machine is connected to a circuit protected by

fuses, use a time delay fuse marked D.)

110V Circuit Requirements

This machine is prewired to operate on a power

supply circuit that has a verified ground and meets

the following requirements:

Nominal Voltage ........................................ 110V

Cycle ..........................................................60 Hz

Phase ........................................... Single-Phase

Power Supply Circuit ..................................15A

Serious injury could occur if you connect

machine to power before completing setup

process. DO NOT connect to power until

instructed later in this manual.

-10- Model G2790 (Mfd. Since 04/13)

Improper connection of the equipment-grounding

wire can result in a risk of electric shock. The

wire with green insulation (with or without yellow

stripes) is the equipment-grounding wire. If repair

or replacement of the power cord or plug is nec-

essary, do not connect the equipment-grounding

wire to a live (current carrying) terminal.

Check with a qualified electrician or service per-

sonnel if you do not understand these grounding

requirements, or if you are in doubt about whether

the tool is properly grounded. If you ever notice

that a cord or plug is damaged or worn, discon-

nect it from power, and immediately replace it with

a new one.

Extension Cords

We do not recommend using an extension cord

with this machine.

If you must use an extension

cord, only use it if absolutely necessary and only

on a temporary basis.

Extension cords cause voltage drop, which can

damage electrical components and shorten motor

life. Voltage drop increases as the extension cord

size gets longer and the gauge size gets smaller

(higher gauge numbers indicate smaller sizes).

Any extension cord used with this machine must

be in good condition and contain a ground wire

and matching plug/receptacle. Additionally, it must

meet the following size requirements:

Minimum Gauge Size ...........................16 AWG

Maximum Length (Shorter is Better).......50 ft.

Grounding & Plug Requirements

Figure 4. Typical 5-15 plug and receptacle.

Grounding Prong

Neutral Hot

5-15 PLUG

GROUNDED

5-15 RECEPTACLE

SHOCK HAZARD!

Two-prong outlets do not meet the grounding

requirements for this machine. Do not modify

or use an adapter on the plug provided—if

it will not fit the outlet, have a qualified

electrician install the proper outlet with a

verified ground.

This machine MUST be grounded. In the event

of certain malfunctions or breakdowns, grounding

reduces the risk of electric shock by providing a

path of least resistance for electric current.

This machine is equipped with a power cord that

has an equipment-grounding wire and a grounding

plug. Only insert plug into a matching receptacle

(outlet) that is properly installed and grounded in

accordance with all local codes and ordinances.

DO NOT modify the provided plug!

Model G2790 (Mfd. Since 04/13) -11-

SECTION 3: SETUP

This machine was carefully packaged for safe

transport. When unpacking, separate all enclosed

items from packaging materials and inspect them

for shipping damage.

If items are damaged

please

call us immediately at (570) 546-9663.

IMPORTANT:

Save all packaging materials until

you are completely satisfied with the machine and

have resolved any issues between Grizzly or the

shipping agent. You MUST have the original pack-

aging to file a freight claim. It is also extremely

helpful if you need to return your machine later.

Unpacking

SUFFOCATION HAZARD!

Keep children and pets away

from plastic bags or packing

materials shipped with this

machine. Discard immediately.

This machine presents

serious injury hazards

to untrained users. Read

through this entire manu-

al to become familiar with

the controls and opera-

tions before starting the

machine!

Wear safety glasses during

the entire setup process!

Needed for Setup

The following items are needed, but not included,

for the setup/assembly of this machine.

Description Qty

• Rags & Solvent ........................... As Needed

• Mounting Hardware (Page 14) ... As Needed

• Open-End Wrench 12mm ........................... 1

• Hex Wrench 4mm ....................................... 1

-12- Model G2790 (Mfd. Since 04/13)

Box 1 Contents (Figure 5) Qty

A. Grinding Assembly w/Pivot Support ........... 1

B. Wheel Dressing Stone ............................... 1

C. Wheel Dressing Tool Holder ...................... 1

D. Star Knobs 1⁄4"-20 x 1⁄2"............................... 2

E. Flat Washers 1⁄4" ......................................... 2

F. Adjustable Guard ........................................ 1

G. Star Knobs 1⁄4"-20 x 23⁄4" ............................. 5

H. Star Knobs 1⁄4"-20 x 7⁄8" ............................... 5

I. O-Rings 6 x 2mm ....................................... 5

J. Hex Nuts 1⁄4"-20 .......................................... 5

Box 2 Contents (Figure 6) Qty

K. Slide Table .................................................. 1

L. Slide Bar ..................................................... 1

M. Knife Clamp ................................................ 1

Figure 5. Box 1 inventory.

DEF

G H

NOTICE

If you cannot find an item on this list, care-

fully check around/inside the machine and

packaging materials. Often, these items get

lost in packaging materials while unpack-

ing or they are pre-installed at the factory.

Inventory

The following is a list of items shipped with your

machine. Before beginning setup, lay these items

out and inventory them.

If any non-proprietary parts are missing (e.g. a

nut or a washer), we will gladly replace them; or

for the sake of expediency, replacements can be

obtained at your local hardware store.

Figure 6. Box 2 inventory.

Model G2790 (Mfd. Since 04/13) -13-

Cleanup

The unpainted surfaces of your machine are

coated with a heavy-duty rust preventative that

prevents corrosion during shipment and storage.

This rust preventative works extremely well, but it

will take a little time to clean.

Be patient and do a thorough job cleaning your

machine. The time you spend doing this now will

give you a better appreciation for the proper care

of your machine's unpainted surfaces.

There are many ways to remove this rust preven-

tative, but the following steps work well in a wide

variety of situations. Always follow the manufac-

turer’s instructions with any cleaning product you

use and make sure you work in a well-ventilated

area to minimize exposure to toxic fumes.

Before cleaning, gather the following:

• Disposable rags

• Cleaner/degreaser (WD•40 works well)

• Safety glasses & disposable gloves

• Plastic paint scraper (optional)

Basic steps for removing rust preventative:

Put on safety glasses.

Coat the rust preventative with a liberal

amount of cleaner/degreaser, then let it soak

for 5–10 minutes.

Wipe off the surfaces. If your cleaner/degreas-

er is effective, the rust preventative will wipe

off easily. If you have a plastic paint scraper,

scrape off as much as you can first, then wipe

off the rest with the rag.

Repeat Steps 2–3 as necessary until clean,

then coat all unpainted surfaces with a quality

metal protectant to prevent rust.

NOTICE

Avoid chlorine-based solvents, such as

acetone or brake parts cleaner, that may

damage painted surfaces.

Figure 7. Minimum working clearances.

44"

10"

12"

Site Considerations

Children and visitors may be

seriously injured if unsuper-

vised around this machine.

Lock entrances to the shop

or disable start switch or

power connection to prevent

unsupervised use.

Workbench Load

Refer to the Machine Data Sheet for the weight

and footprint specifications of your machine.

Some workbenches may require additional rein-

forcement to support the weight of the machine

and workpiece materials.

Consider anticipated workpiece sizes and addi-

tional space needed for auxiliary stands, work

tables, or other machinery when establishing a

location for this machine in the shop. Below is

the minimum amount of space needed for the

machine.

Placement Location

-14- Model G2790 (Mfd. Since 04/13)

Mounting

The vibration and forces applied during operation

could cause the grinder to unexpectedly move

and greatly increase the risk of serious personal

injury. You MUST firmly mount your grinder to a

stable and flat surface that will not move during

operation.

Note: The rubber feet provide vibration absorp-

tion for the grinder. We recommend that you keep

them on the machine when you mount it to the

workbench.

Figure 8. Example of a through mount setup.

The base of this machine has mounting holes

that allow it to be fastened to a workbench or

other mounting surface to prevent it from moving

during operation and causing accidental injury or

damage.

The strongest mounting option is a "Through

Mount" (see example below) where holes are

drilled all the way through the workbench—and

hex bolts, washers, and hex nuts are used to

secure the machine in place.

Machine Base

Workbench

Hex

Bolt

Flat Washer

Lock Washer

Hex Nut

Number of Mounting Holes ............................ 2

Diameter of Mounting Hardware Needed .. 1⁄2"

Figure 9. Example of a direct mount setup.

Machine Base

Workbench

Lag Screw

Flat Washer

Another option is a "direct mount" (see example

below) where the machine is secured directly to

the workbench with lag screws and washers.

Model G2790 (Mfd. Since 04/13) -15-

Assembly

The machine must be fully assembled before it

can be operated. Before beginning the assembly

process, refer to

Needed for Setup and gather

all

listed items. To ensure the assembly process

goes smoothly, first clean any

parts that are cov-

ered or coated in heavy-duty rust preventative (if

applicable).

To assemble your machine:

1. Install adjustable guard on pre-installed wheel

guard using (2) 1⁄4"-20 x 1⁄2" star knobs and (2)

1⁄4" flat washers, as shown in Figure 10.

Figure 10. Adjustable guard installed (slide bar,

knife clamp installed for illustration purposes).

Star Knobs

w/Flat Washers

Adjustable

Guard

2. Loosen star knobs, position adjustable guard

approximately 1⁄8" away from knife clamp or

stationary clamp, then tighten star knobs

to secure setting (see Figure 11). Refer to

Page 20 or Page 22 for detailed instructions

on installing the stationary clamps and knife

clamp.

The adjustable guard reduces the risk of injury

by shielding the user from flying sparks/debris

and preventing fingers from contacting the grind-

ing wheel during operation. Once you install the

guard, you will need to adjust it according to the

needs of your operation.

Figure 11. Adjustable guard adjusted to

approximately 1⁄8" from knife clamp.

1⁄8" Gap Between

Adjustable Guard

and Knife Clamp

3. If necessary, adjustable guard may also be

set up at an angle to the wheel guard (see

Figure 12).

Figure 12. Adjustable guard alternate setup

(knife clamp removed for illustration purposes).

Wheel

Guard

-16- Model G2790 (Mfd. Since 04/13)

Test Run To test run machine:

1. Clear all setup tools away from machine.

2. Connect machine to power supply.

3. Turn machine ON.

Listen to and watch for abnormal noises or

actions. The machine should run smoothly

with little or no vibration or rubbing noises.

— Strange or unusual noises should be inves-

tigated and corrected before operating the

machine further. Always disconnect the

machine from power when investigating or

correcting potential problems.

4. Turn machine OFF.

Once assembly is complete, test run the machine

to ensure it is properly connected to power and

safety components are functioning correctly.

If you find an unusual problem during the test run,

immediately stop the machine, disconnect it from

power, and fix the problem BEFORE operating the

machine again. The

Troubleshooting

table in the

SERVICE section of this manual can help.

DO NOT start machine until all preceding

setup instructions have been performed.

Operating an improperly set up machine

may result in malfunction or unexpect-

ed results that can lead to serious injury,

death, or machine/property damage.

Serious injury or death can result from

using this machine BEFORE understanding

its controls and related safety information.

DO NOT operate, or allow others to operate,

machine until the information is understood.

Model G2790 (Mfd. Since 04/13) -17-

SECTION 4: OPERATIONS

Grinding Tips

The grinder is a safe tool when used properly. In

addition to the safety instructions in this manual,

the most important safety consideration is to use

common sense at all times.

Follow these rules when grinding:

• Make sure the wheel guard and blade sup-

ports are correctly mounted and secure.

• Remember that grinding often produces

sparks. DO NOT allow anyone to stand in the

path of the sparks without protective clothing

and equipment. DO NOT grind near flam-

mable materials.

• Maintain proper care of your wheels. Refer to

Wheel Care on Page 18 for detailed instruc-

tions.

• Wear the proper protective clothing. Particles

flying from the grinding wheel are traveling

at a high rate of speed—prepare for this!

Wear safety glasses/face shield, a NIOSH

approved dust mask or respirator, ear pro-

tection, a leather apron, and heavy leather

boots.

• Grasp the workpiece or support firmly.

Maintain even pressure and control of the

workpiece, especially when using the slide

bar.

• To avoid overheating the tool, grind the cut-

ting tool with multiple light passes instead of

one heavy operation.

• Concentrate on the task at hand. STOP

grinding if other people are distracting you or

your mind is on something else.

• To some, correctly grinding cutting tools is an

art. If you are not familiar with this process,

get help from an experienced person or read

books to become familiar with the correct

procedures required to sharpen your tools.

To reduce your risk of

serious injury, read this

entire manual BEFORE

using machine.

Eye injuries, respiratory problems, or hear-

ing loss can occur while operating this

tool. Wear personal protective equipment to

reduce your risk from these hazards.

If you are not experienced with this type

of machine, WE STRONGLY RECOMMEND

that you seek additional training outside of

this manual. Read books/magazines or get

formal training before beginning any proj-

ects. Regardless of the content in this sec-

tion, Grizzly Industrial will not be held liable

for accidents caused by lack of training.

Keep hair, clothing, and

jewelry away from mov-

ing parts at all times.

Entanglement can result

in death, amputation, or

severe crushing injuries!

-18- Model G2790 (Mfd. Since 04/13)

Wheel Selection

Your Model G2790 uses only Type 5 grinding

wheels that have a 1⁄2" bore and are 6" in diameter

and 1 1⁄2" thick, similar to the one included with

your grinder. Refer to Accessories on Page 24

for options from Grizzly.

Aluminum oxide and silicon carbide wheels are

typically marked in a uniform manner by all major

manufacturers. Understanding these markings

will help you understand the capabilities of vari-

ous wheels.

The typical format for wheel numbering is:

Type Abrasive

Type

Grit

Size Grade Bond

Type

5 A 100 K V

• Type: Refers to a particular wheel configura-

tion, such as Type 5, which has a recessed

center for the top-mounting flange.

• Abrasive Type: Refers to the abrasive grain

of the wheel. The most common types are A

for aluminum oxide, C for silicon carbide, and

SG for seeded gel.

• Grit Size: Refers to the size of the abrasive

grain in the wheel. The lower the number, the

coarser the wheel.

• Grade: Indicates the hardness of the wheel

with A being the softest and Z being the hard-

est.

• Bond Type: Refers to the type of bonding

material used to hold the abrasive grain.

Most general-purpose wheels will have a

V, indicating vitrified clay, which provides

high strength and good porosity. The other

common bond type is B for synthetic resins,

which are generally used to grind cemented

carbide and ceramic materials.

Note: There may be other numbers or letters

that have meaning for a particular type of wheel.

Always refer to the manufacturer's technical data

for a complete explanation when choosing a

grinding wheel.

Wheel Care

Your safety when grinding depends, in a large

part, on the condition of the wheel during opera-

tion. A wheel in poor condition increases the risk

of it flying apart while spinning and injuring the

operator or causing property damage.

Follow these rules to reduce the risk of break-

ing the wheel:

• Always transport, store, and handle wheels

with care. Wheels could be damaged if they

are dropped or if heavy objects are stacked

on them.

• Select the right grinding wheel for the job. DO

NOT grind materials that are not correct for

the wheel type.

• Select the right grinding wheel for the machine.

If a grinding wheel rotates faster than its RPM

rating, it could fly apart during operation.

• Mount the wheels properly (refer to Wheel

Replacement on Page 28 for detailed instruc-

tions). Never use a wheel with the wrong bore

size for the machine.

• Do not abuse the wheel by jamming the

work into the grinding wheel with excessive

force or by allowing the workpiece to become

overly hot during operation.

• Do not store wheels in a damp or wet location

that will damage the bonding material.

• Replace the wheel when it becomes less

than 1⁄2 of its original thickness or less than

3⁄4".

• Use only the wheel flanges that are included

with for your grinder.

• To ensure good grinding results, dress the

wheel often (refer to Wheel Dressing on

Page 27 for detailed instructions).

• Always visually inspect and perform the ring

test before installing any grinding wheel (refer

to Wheel Inspection & Ring Test on Page

19 for detailed instructions).

Model G2790 (Mfd. Since 04/13) -19-

Wheel Inspection &

Ring Test

Do not assume that a grinding wheel is in sound

condition just because it is new or looks okay.

Often damage can occur in shipping, with age,

or with exposure to moisture, and may not be

visible. Inspect every wheel for damage before

installation.

First, do a visual inspection. Look for any cracks,

chips, nicks or dents in the surface of the wheel. If

you see any of these, DO NOT use the wheel.

Second, do a ring test. This test will give you an

indication of any internal damage that may not be

obvious during a visual inspection. If the wheel

does not pass the ring test, DO NOT use the

wheel.

To perform a ring test:

1. Make sure the wheel that you test is clean and

dry—otherwise, you may get false results.

2. If size permits, balance the wheel with your

finger in the center hole. If this is not possible,

hang the wheel in the air with a piece of cord

or string looped through the center hole.

3. At the four spots on the wheel shown in

Figure 13, gently tap the wheel with a non-

metallic object, such as a screwdriver handle

or wooden mallet.

Figure 13. Tapping locations for a ring test.

4. An undamaged wheel will emit a clear metal-

lic ring or “ping” sound in each of the four

spots. A damaged wheel will respond with a

dull thud that has no clear tone.

— If you determine from the results of the ring

test that the wheel is damaged, DO NOT

use it!

Mounting Pivot

Support

The pivot support is used to hold the stationary

clamps for narrow tools and the slide table and

bar for wide knives.

To mount the pivot support on the grinder

table:

1. DISCONNECT MACHINE FROM POWER!

2. Loosen the four lock knobs on the sides of the

pivot support, then slide the support flanges

onto the table, as shown in Figure 14.

3. Use the knurled wheel of the pivot gear to

set the correct angle for your operation, then

tighten all four lock knobs.

Figure 14. Pivot support installed.

Lock

Knob

Pivot Gears

Pivot Support

Flange

-20- Model G2790 (Mfd. Since 04/13)

Sharpening Narrow

Tools

The stationary clamps mounted on the pivot sup-

port hold tools with narrow cutting widths, such

as chisels, that have a beveled edge which can

be squarely aligned with the flat of the wheel, as

shown in Figure 15.

To sharpen a narrow tool bevel:

1. DISCONNECT MACHINE FROM POWER!

2. Install the pivot support onto the grinder table

with the two stationary clamps attached.

3. Center the tool on the pivot support between

the clamps, slide them together to firmly hold

the tool, then tighten their knobs to secure

them in place, as shown in Figure 15.

4. Loosen the table lock, then use the table

handwheel to lower the grinder table until

the top surface of the wheel is even with the

table.

5. Adjust the angle of the pivot support and its

position on the table and in the clamps so

that the tool bevel just makes contact with

the wheel, as shown in Figure 15, then make

sure the stationary clamps and four pivot sup-

port lock knobs are tight.

6. Once you are satisfied with the position of the

tool relative to the wheel, raise the grinder

table slightly above the wheel, then turn the

grinder ON.

7. While firmly holding the tool on the pivot sup-

port, slowly and carefully lower the grinder

table until the tool contacts the wheel to begin

sharpening the tool.

Note: Keep in mind that with a dry grinding

operation, tools can heat up quickly and lose

their temper. Sharpening should be done in

light passes and for short durations to avoid

damaging the tool or wheel.

Tip: Apply marker ink to the full beveled sur-

face of the tool to help verify when the tool

is properly ground. Also, a fine straightedge

held to the bevel will show any variations.

Cutting tools are dangerously sharp, espe-

cially after sharpening. Use extreme caution

when handling these tools to reduce the risk

of personal injury.

Sharpening Wide

Knives

Wide knives, such as jointer and planer blades,

are firmly held in the slide bar assembly that

is then mounted on the slide table above the

wheel.

Tools Needed Qty

Wrench 10mm ................................................... 1

Wrench or Socket 12mm ................................... 1

Fine Ruler .......................................................... 1

To sharpen wide knives:

1. DISCONNECT MACHINE FROM POWER!

2. Remove the adjustable guard.

Figure 15. Stationary clamps holding a narrow

tool.

Stationary

Clamp

Model G2790 (Mfd. Since 04/13) -21-

5. Re-attach the pivot support to the grinder

table so that the flat surface of the slide table

is facing the wheel, as shown in Figure 18.

Figure 18. Pivot support and slide table

assembly properly attached to the grinder.

Cutting tools are dangerously sharp, espe-

cially after sharpening. Use extreme caution

when handling these tools to reduce the risk

of personal injury.

3. Then place the slide table on a flat surface

and remove the three hex bolts and flat wash-

ers, as shown in Figure 16.

4. Remove the pivot support from the machine,

then secure it to the back of the slide table

with the three hex nuts and flat washers

removed in Step 3, as shown in Figure 17.

Figure 16. Slide table dismantled.

Slide Table

Hex Bolts

& Flat

Washers

Figure 17. Pivot support attached to the slide

table.

Pivot Support

6. Install (5) 1⁄4"-20 x 23⁄4" knife adjustment

knobs on the slide bar, each with (1) O-ring

and (1) 1⁄4"-20 hex nut. Then back the adjust-

ment knobs out enough so that the knife can

be positioned in the middle of the slide bar

and even with its front edge, as shown in

Figure 19.

Figure 19. Wide knife placed on the slide bar

even with the front edge.

Wide Knife

O-Ring Hex Nut

1⁄4"-20 x 23⁄4"

Knife Adjustment

Knob

-22- Model G2790 (Mfd. Since 04/13)

A wide knife must be centered on the slide

bar and be supported by at least two adjust-

ment knobs to reduce the risk of the knife

coming loose during operation and causing

personal injury or property damage.

7. Using a fine ruler, tighten the adjustment

knobs to force the knife forward so that it

extends beyond the front edge of the slide

bar approximately 1⁄4" along its full length, as

shown in Figure 20.

Note: The distance the knife extends beyond

the slide bar may vary depending on the

angle required to grind the bevel. However,

make sure the slide bar will not make contact

with the grinding wheel during operation to

prevent damaging the bar.

Figure 20. Extending the knife beyond the front

edge of the slide bar.

8. When you are satisfied that the knife extends

beyond the slide bar the same amount along

its length and that the supporting adjustment

knobs are all making even contact with the

back of the knife, re-tighten the jam nuts and

attach the knife clamp to the slide bar with (5)

1⁄4"-20 x 7⁄8" knife clamp knobs, as shown in

Figure 21.

9. Use the fine ruler to re-check the distance the

knife extends from the slide bar.

— If the distance is not correct or the same

along the full length of the knife, slightly

loosen the knife clamp knobs and adjust the

knife adjustment knobs until the extended

distance is correct. Then, re-tighten the

jam nuts and knife clamp knobs and check

the distance again. If necessary, repeat

this process until the distance is correct

and the knife is securely clamped.

Figure 21. Knife clamped to the slide bar.

Knife

Knife Clamp

1⁄4"-20 x 7⁄8"

Knife Clamp

Knob

Model G2790 (Mfd. Since 04/13) -23-

10. Carefully place the slide bar assembly on the

slide table, as shown in Figure 22, loosen the

table lock, then lower the grinder table until

the wheel just makes contact with the knife.

Note: Make sure the grinder table and the

top wheel surface are level with each other.

You may have to push down or pull up on one

side of the grinder table to make them level

with each other.

Figure 22. Slide bar assembly and knife

mounted on the grinder.

— If the wheel does not move evenly when

the knife slides across it from one end to

the other, either the knife is not evenly

mounted in the slide bar or the surface

of the wheel is not level with the grinder

table. To ensure good grinding results, you

must make the knife bevel level and paral-

lel with the wheel surface along its entire

length before continuing with this proce-

dure. Refer to the Troubleshooting chart

on Page 29 for possible solutions.

12. Once you are satisfied with the position of the

knife relative to the wheel, raise the grinder

table until the wheel is below the table sur-

face, then move the slide bar so that the end

of the knife is over the right hand side of the

wheel, as shown in Figure 23.

13. Re-install the adjustable guard, then turn the

grinder ON.

14. Slowly lower the grinder table until the knife

and wheel just make contact, then slowly

slide the knife across the wheel.

— If contact does not seem smooth and con-

sistent between the knife and the wheel,

turn the grinder OFF and repeat Steps

5–14 until it is.

Note: Keep in mind that with a dry grinding

operation, the knife can heat up quickly and

lose its temper. Sharpening should be done

in light passes and for short durations to

avoid damaging the knife or wheel.

11. Use the slide bar to slowly move the blade

across the wheel from one side to the other

and note the movement of the wheel.

— If the wheel moves evenly when the knife

moves across it from one end to the other,

continue with Step 12.

Figure 23. Knife positioned over the right side of

the wheel (guard not shown for clarity).

Knife Edge

Make sure the grinding wheel is more than

1⁄4" below the lowest point of the wheel

guard to avoid the risk of the wheel and

guard making contact resulting in the wheel

breaking apart and possibly causing seri-

ous personal injury.

-24- Model G2790 (Mfd. Since 04/13)

SECTION 5: ACCESSORIES

ACCESSORIES

G7416—Type 5 Grinding Wheel, 120 Grit

G7417—Type 5 Grinding Wheel, 180 Grit

G7418—Type 5 Grinding Wheel, 220 Grit

G7419—Type 5 Grinding Wheel, 320 Grit

Aluminum oxide abrasive grain, 6" x 1

1⁄2", 1⁄2"

bore.

Figure 24. Type 5 aluminum oxide grinding

wheel.

T20502—Face Shield Crown Protector 7"

T20503—Face Shield Window

T20451—"Kirova" Clear Safety Glasses

T20452—"Kirova" Anti-Reflective Glasses

H7194—Bifocal Safety Glasses 1.5

H0736—Shop Fox® Safety Glasses

These glasses meet ANSI Z87.1-2003 specifica-

tions. Buy extras for visitors or employees. You

can't be too careful with shop safety!

Figure 26. Our most popular eye protection.

T20451

H0736

T20452

T20502

T20503

H7194

H2499—Small Half-Mask Respirator

H3631—Medium Half-Mask Respirator

H3632—Large Half-Mask Respirator

H3635—Cartridge Filter Pair P100

Wood dust has been linked to nasal cancer and

severe respiratory illnesses. If you work around

dust everyday, a half-mask respirator can be a

lifesaver. Also compatible with safety glasses!

Figure 25. Half-mask respirator with disposable

cartridge filters.

order online at www.grizzly.com or call 1-800-523-4777

Installing unapproved accessories may

cause machine to malfunction, resulting in

serious personal injury or machine damage.

To reduce this risk, only install accessories

recommended for this machine by Grizzly.

NOTICE

Refer to our website or latest catalog for

additional recommended accessories.

Model G2790 (Mfd. Since 04/13) -25-

G3092—Diamond Dresser Tool

Industrial diamond dresser tool made especially

for dressing the wheels of the G2790 Universal

Knife Grinder. Comes with plastic case and pro-

tective rubber end cap.

Figure 28. G3092 diamond dresser tool.

order online at www.grizzly.com or call 1-800-523-4777

Model H5944—#0 Wheel Dresser

Model H5945—#1 Wheel Dresser

Model H5946—#2 Wheel Dresser

Exposes new grains for aggressive cutting on all

types of grinding wheels. Star wheels and discs

are hardened steel. Cast iron handle provides

stabilizing mass for better control.

Figure 27. Rotary-type dressing tools.

D2056—Tool Table

Get that benchtop tool off your bench and put

it on this sturdy stand instead! Flared legs and

adjustable rubber feet ensure stability and re-

duce machine vibration. Butcher block finish

table top measures 1" x 13" x 23" and is 301⁄2"

from the floor. Bottom measures 21" x 32". 700

lb. capacity!

Figure 29. Tool table.

Figure 30. T23248 Fundamentals of Sharpening

Book.

T23248—Fundamentals of Sharpening Book

This book contains techniques for keeping hand

tools like saws, chisels, gouges, and planes razor

sharp. It also shows how to extend the life of

power tools with well maintained blades and bits.

120 pages.

-26- Model G2790 (Mfd. Since 04/13)

SECTION 6: MAINTENANCE

Cleaning the Model G2790 is relatively easy. Use

a vacuum to clean debris and dust from the grind-

er, then protect the unpainted cast iron surfaces

with regular applications of a rust protectant.

Cleaning

For optimum performance from your machine,

follow this maintenance schedule and refer to any

specific instructions given in this section.

Daily Check:

• Loose mounting bolts.

• Damaged or worn grinding wheel (Page 19).

• Worn or damaged wires.

• Any other unsafe condition.

Daily Maintenance:

• Clean the grinder.

• Check/dress the grinding wheel surface

(Page 27).

Schedule

Lubrication

The bearings of the motor are factory lubricated

and sealed. Simply leave them alone unless they

need replacement.

Raise the table up to access the full length of the

handwheel lead screw, as shown in Figure 31.

Use a shop rag and mineral spirits to clean off the

threads of the leadscrew, then brush or wipe on a

thin coat of light machine oil.

Apply a few drops of the same oil to the ball bear-

ings under the handwheel, then move the table up

and down to distribute the lubricant.

Figure 31. Leadscrew and ball bearings.

Leadscrew

Ball Bearings

To reduce risk of shock or

accidental startup, always

disconnect machine from

power before adjustments,

maintenance, or service.

Model G2790 (Mfd. Since 04/13) -27-

Note: You may have to push down or pull up

on one side of the table to make it even with

the wheel.

2. Remove (2) M5-.8 x 35 cap screws, (2)

5mm flat washers, and (2) spacers shown in

Figure 32, then remove the wheel guard.

Figure 32. Location of wheel guard fasteners.

Spacer

(1 of 2)

Cap Screw

w/Flat Washer

(1 of 2)

3. Attach the pivot support (see Figure 33)

to the grinder table (refer to instructions on

Page 19).

Figure 33. Diamond dresser mounted on pivot

support above grinding wheel.

Diamond Dresser

Dresser Tool

Holder

4. Place the dresser tool holder on the pivot

support, as shown in Figure 33, insert the

diamond dresser into the holder until the tip

makes contact with the wheel, then tighten

the set screw in the holder to secure the

dresser tool.

Pivot

Support

5. Move the dresser tool so that the tip is just

outside the wheel's diameter, then turn the

grinder ON.

6. Slowly move the dresser tool across the

wheel, then back to the starting position two

to three times.

7. Lower the table slightly and repeat Step 6.

Note: Several light passes with the dress-

ing tool will produce the best results with the

least amount of wear or damage to the wheel

or the dressing tool.

Grinding wheels have the capability of

removing a lot of skin quickly. Keep a firm

grip on the dresser tool and holder, and keep

your hands a safe distance away from the

spinning wheel.

Wheel Dressing

With use, the surface of the grinding wheel will fill

with metal residue and grit. When this happens,

the wheel needs to be cleaned or “dressed.” The

goal of dressing the wheel is to remove the con-

taminants and make the surface even and flat.

The dressing stone included with your grinder can

be used to dress the wheel by carefully holding it

against the spinning surface. However, the safest

and efficient method of dressing the wheel is to

use a diamond dresser (refer to Accessories on

Page 24 for options).

To dress the wheel with a diamond dresser:

1. Lower the table so that the grinding wheel is

approximately 1⁄4" above the table surface,

then make sure the top surface of the wheel

is level with the grinder table.

-28- Model G2790 (Mfd. Since 04/13)

Wheel Replacement

When the grinding wheel becomes worn, dam-

aged, or less than 3⁄4" thick, you need to replace

it.

Tools Needed Qty

Hex Wrench 4mm .............................................. 1

To replace the grinding wheel:

1. DISCONNECT MACHINE FROM POWER!

2. Remove the pivot support and wheel guard

from the machine.

3. Fully loosen the cap screw in the center of

the wheel, then lift the wheel, flange, and

cap screw up and off the motor spindle (see

Figure 34).

Figure 34. Grinding wheel removed from grinder.

4. Perform the Wheel Inspection & Ring Test

procedure (Page 19) on the new wheel.

5. If the new wheel is acceptable, carefully

place it on the motor spindle.

6. Install the top wheel flange and tighten the

cap screw to secure the assembly.

Note: Do not over-tighten the wheel mount-

ing cap screw to avoid cracking the wheel.

7. Replace the wheel guard, then spin the wheel

by hand to make sure it does not make con-

tact with the guard or housing.

Model G2790 (Mfd. Since 04/13) -29-

Troubleshooting

Motor & Electrical

Symptom Possible Cause Possible Solution

Machine does not

start or a breaker

trips.

1. Power supply switched OFF or at fault.

2. Plug/receptacle at fault/wired wrong.

3. Start capacitor at fault.

4. Motor connection wired wrong.

5. Wall circuit breaker tripped.

6. Wiring open/has high resistance.

7. Motor ON/OFF switch at fault.

8. Motor at fault.

1. Ensure power supply is on/has correct voltage.

2. Test for good contacts; correct the wiring.

3. Test/replace if faulty.

4. Correct motor wiring connections (Page 32).

5. Ensure circuit size is correct/replace weak breaker.

6. Check/fix broken, disconnected, or corroded wires.

7. Replace switch.

8. Test/repair/replace.

Machine stalls or is

underpowered.

1. Motor wired incorrectly.

2. Plug/receptacle at fault.

3. Motor bearings at fault.

4. Machine undersized for task.

5. Contactor not energized/has poor contacts.

6. Motor overheated.

7. Motor at fault.

1. Wire motor correctly (Page 32).

2. Test for good contacts/correct wiring.

3. Test/repair/replace.

4. Use new grinding wheel; reduce the depth of cut and

feed rate.

5. Test all legs for power/replace if faulty.

6. Clean motor, let cool, and reduce workload.

7. Test/repair/replace.

Machine has

vibration or noisy

operation.

1. Motor or component loose.

2. Grinding wheel at fault; bore hole not

round.

3. Incorrectly mounted to workbench.

4. Motor bearings at fault.

5. Motor shaft bent.

1. Inspect/replace damaged bolts/nuts, and re-tighten

with thread locking fluid.

2. Dress/replace grinding wheel.

3. Adjust feet, shim, or tighten mounting hardware.

4. Test by rotating shaft; rotational grinding/loose shaft

requires bearing replacement.

5. Test with dial indicator and replace motor.

Review the troubleshooting and procedures in this section if a problem develops with your machine. If

you need replacement parts or additional help with a procedure, call our Technical Support.

Note:

Please

gather the serial number and manufacture date of your machine before calling.

SECTION 7: SERVICE

-30- Model G2790 (Mfd. Since 04/13)

Operation

Symptom Possible Cause Possible Solution

Wavy pattern on

workpiece surface.

1. Machine vibrating.

2. Workpiece loose in clamping device.

3. Wheel face is uneven.

4. Wheel grade is too hard.

1. Shim/tighten mounting hardware.

2. Correctly re-clamp the workpiece.

3. Dress the wheel (Page 27).

4. Use softer grade wheel; reduce depth of cut and

feed rate.

Lines on workpiece

surface.

1. Impurity on wheel surface.

2. Workpiece loose in clamping device.

1. Dress the wheel (Page 27).

2. Correctly re-clamp the workpiece.

Burned spots

or cracks in

workpiece.

1. Improper type of grinding wheel.

2. Feed rate too slow.

3. Depth of cut too great.

4. Workpiece overheating.

1. Use the correct type of grinding wheel (Page 18).

2. Increase feed rate.

3. Reduce depth of cut; take multiple light passes.

4. Grind in short durations and allow workpiece to cool

in between.

Wheel dulls quickly,

grit falls off.

1. Depth of cut too great.

2. Wheel grade is too soft.

3. Wheel exposed to moisture.

4. Wheel dressed incorrectly.

5. Defective wheel bonding.

1. Reduce depth of cut; take multiple light passes.

2. Use harder grade of wheel.

3. Store wheel away from moisture; replace wheel.

4. Correctly dress the wheel (Page 27).

5. Replace wheel (Page 28).

Wheel clogs and

workpiece shows

burn marks.

1. Wheel grade is too hard.

2. Feed rate too slow.

3. Wheel dressed incorrectly.

4. Workpiece incorrect material.

1. Use softer grade of wheel.

2. Increase feed rate.

3. Correctly dress the wheel (Page 27).

4. Grind ferrous materials only.

Cutting tool is ground

unevenly from one

side to other.

1. Tool not properly clamped.

2. Grinding table and wheel not level with each

other.

3. Wheel dressed incorrectly or has

impurities.

4. Wheel is damaged.

1. Properly re-clamp tool.

2. Push down or pull up grinding table to make it level

with the wheel.

3. Correctly dress the wheel (Page 27).

4. Replace wheel (Page 28).

Model G2790 (Mfd. Since 04/13) -31-

SHOCK HAZARD. Working on wiring that is con-

nected to a power source is extremely dangerous.

Touching electrified parts will result in personal

injury including but not limited to severe burns,

electrocution, or death. Disconnect the power

from the machine before servicing electrical com-

ponents!

MODIFICATIONS. Modifying the wiring beyond

what is shown in the diagram may lead to unpre-

dictable results, including serious injury or fire.

This includes the installation of unapproved after-

market parts.

WIRE CONNECTIONS. All connections must

be tight to prevent wires from loosening during

machine operation. Double-check all wires dis-

connected or connected during any wiring task to

ensure tight connections.

CIRCUIT REQUIREMENTS. You MUST follow

the requirements at the beginning of this manual

when connecting your machine to a power source.

WIRE/COMPONENT DAMAGE. Damaged wires

or components increase the risk of serious per-

sonal injury, fire, or machine damage. If you notice

that any wires or components are damaged while

performing a wiring task, replace those wires or

components.

MOTOR WIRING. The motor wiring shown in

these diagrams is current at the time of printing

but may not match your machine. If you find this

to be the case, use the wiring diagram inside the

motor junction box.

CAPACITORS/INVERTERS. Some capacitors

and power inverters store an electrical charge for

up to 10 minutes after being disconnected from

the power source. To reduce the risk of being

shocked, wait at least this long before working on

capacitors.

EXPERIENCING DIFFICULTIES. If you are expe-

riencing difficulties understanding the information

included in this section, contact our Technical

Support at (570) 546-9663.

Wiring Safety Instructions

The photos and diagrams

included in this section are

best viewed in color. You

can view these pages in

color at www.grizzly.com.

These pages are current at the time of printing. However, in the spirit of improvement, we may make chang-

es to the electrical systems of future machines. Compare the manufacture date of your machine to the one

stated in this manual, and study this section carefully.

If there are differences between your machine and what is shown in this section, call Technical Support at

(570) 546-9663 for assistance BEFORE making any changes to the wiring on your machine. An updated

wiring diagram may be available. Note: Please gather the serial

number and manufacture date of your

machine before calling. This information can be found on the main machine label.

SECTION 8: WIRING

machine

-32- Model G2790 (Mfd. Since 04/13)

READ ELECTRICAL SAFETY

ON PAGE 31!

Ground

Motor

1 2 3

ON/OFF

Switch

Start Capacitor

10MFD 250VAC

Ground

Neutral

Hot

110 VAC

NEMA 5-15 Plug

(As Recommended)

Wiring Diagram

Figure 35. G2790 wiring.

wiring diagram

Model G2790 (Mfd. Since 04/13) -33-

456

14 14A

21V2

22V2

26V2

28V2

28-1

38V2

49V2

20V2

29V2

30 31V2

32V2

40V3

42V2

40A

Parts Breakdown

SECTION 9: PARTS

-34- Model G2790 (Mfd. Since 04/13)

Parts List

REF PART # DESCRIPTION REF PART # DESCRIPTION

1 P2790001 STAR KNOB 1/4-20 X 7/8 30 P2790030 GRINDING WHEEL 5/8"/5/A/0/120G

2 P2790002 KNIFE CLAMP 31V2 P2790031V2 ALUM TOP WHL FLANGE V2.09.12

3 P2790003 SLIDING BAR 32V2 P2790032V2 CAP SCREW M5-.8 X 20 V2.05.15

4 P2790004 O-RING 6 X 2 33 P2790033 HEX NUT 5/16-18

5 P2790005 HEX NUT 1/4-20 34 P2790034 TABLE LOCK LEVER

6 P2790006 STAR KNOB 1/4-20 X 2-3/4 35 P2790035 TABLE LEADSCREW 5/8-11 X 3-3/4

7 P2790007 SLIDING TABLE 36 P2790036 STEEL BALL

8 P2790008 RIGHT PIVOT SUPPORT FLANGE 37 P2790037 HANDWHEEL

9 P2790009 LEFT PIVOT SUPPORT FLANGE 38V2 P2790038V2 HEX BOLT 1/4-20 X 1-3/4

10 P2790010 STAR KNOB 1/4-20 X 1/2 39 P2790039 CAP SCREW M5-.8 X 35

11 P2790011 PIVOT KNOB 40V3 P2790040V3 ALUM WHEEL GUARD V3.02.16

12 P2790012 FLAT WASHER 1/4 40A P2790050 STONE HEIGHT LABEL

13 P2790013 PIVOT ROTATION WHEEL 41 P2790041 SPACER

14 P2790014 PIVOT SUPPORT 42V2 P2790042V2 GRINDING TABLE V2.12.12

14A P2790014A DEGREE SCALE 44 P2790044 CAPACITOR CLIP

15 P2790015 HEX BOLT 5/16-18 X 1/2 45 P2790045 FLAT WASHER 5/16

16 P2790016 STAR KNOB 10-24 X 3/4 46 P2790046 WIRE NUT 14-22 GAUGE

17 P2790017 STATIONARY CLAMP 47 P2790047 DRESSING STONE

18 P2790018 STATIONARY CLAMP NUT 10-24 48 P2790053 STRAIN RELIEF STRAIGHT LT

19 P2790019 DRESSING TOOL HOLDER 49V2 P2790049V2 MACHINE ID LABEL CSA V2.09.12

20V2 P2790020V2 SET SCREW 5/16-18 X 5/16 V2.04.14 50 P2790054 RESPIRATOR/GLASSES 1.5W X 2.5H

21V2 P2790021V2 POWER CORD 18G 3W 82"L 5-15 51 P2790051 READ MANUAL 1.5W X 2.5H

22V2 P2790022V2 ON/OFF SWITCH V2.09.12 52 P2790052 EXT TOOTH WASHER #10

23 P2790023 COVER PLATE 53 P2790053 ELECTRICITY 0.5W X 0.4H

24 P2790024 RUBBER BASE FOOT 54 P2790054 CORD CLIP ACC-3

25 P2790025 PHLP HD SCR 10-24 X 3/8 55 P2790055 FLAT WASHER #8

26V2 P2790026V2 FLANGE SCREW 10-24 X 3/8 56 P2790056 FLAT WASHER 3/16

27 P2790027 S CAPACITOR 10M 250V 1-1/8 X 1-1/2 57 P2790057 ADJUSTABLE GUARD 170 X 80 X 3MM

28V2 P2790028V2 MOTOR HOUSING V2.12.12 58 P2790058 FLAT WASHER 3/16

28-1 P2790028-1 MOTOR 1/2HP 110V 1-PH 59 P2790059 SET SCREW 1/4-20 X 1-1/4

29V2 P2790029V2 ALUM BOTTOM WHL FLANGE V2.09.12

We do our best to stock replacement parts when possible, but we cannot guarantee that all parts shown

are available for purchase. Call (800) 523-4777 or visit www.grizzly.com/parts to check for availability.

CUT ALONG DOTTED LINE

Name _____________________________________________________________________________

Street _____________________________________________________________________________

City _______________________ State _________________________ Zip _____________________

Phone # ____________________ Email _________________________________________________

Model # ____________________ Order # _______________________ Serial # __________________

WARRANTY CARD

The following information is given on a voluntary basis. It will be used for marketing purposes to help us develop

better products and services. Of course, all information is strictly confidential.

1. How did you learn about us?

____ Advertisement ____ Friend ____ Catalog

____ Card Deck ____ Website ____ Other:

2. Which of the following magazines do you subscribe to?

3. What is your annual household income?

____ $20,000-$29,000 ____ $30,000-$39,000 ____ $40,000-$49,000

____ $50,000-$59,000 ____ $60,000-$69,000 ____ $70,000+

4. What is your age group?

____ 20-29 ____ 30-39 ____ 40-49

____ 50-59 ____ 60-69 ____ 70+

5. How long have you been a woodworker/metalworker?

____ 0-2 Years ____ 2-8 Years ____ 8-20 Years ____ 20+ Years

6. How many of your machines or tools are Grizzly?

____ 0-2 ____ 3-5 ____ 6-9 ____ 10+

7. Do you think your machine represents a good value? _____Yes _____No

8. Would you recommend Grizzly Industrial to a friend? _____Yes _____No

9. Would you allow us to use your name as a reference for Grizzly customers in your area?

Note: We never use names more than 3 times. _____Yes _____No

10. Comments: _____________________________________________________________________

_________________________________________________________________________________

____ Cabinetmaker & FDM

____ Family Handyman

____ Hand Loader

____ Handy

____ Home Shop Machinist

____ Journal of Light Cont.

____ Live Steam

____ Model Airplane News

____ Old House Journal

____ Popular Mechanics

____ Popular Science

____ Popular Woodworking

____ Precision Shooter

____ Projects in Metal

____ RC Modeler

____ Rie

____ Shop Notes

____ Shotgun News

____ Today’s Homeowner

____ Wood

____ Wooden Boat

____ Woodshop News

____ Woodsmith

____ Woodwork

____ Woodworker West

____ Woodworker’s Journal

____ Other:

TAPE ALONG EDGES--PLEASE DO NOT STAPLE

FOLD ALONG DOTTED LINE

GRIZZLY INDUSTRIAL, INC.

P.O. BOX 2069

BELLINGHAM, WA 98227-2069

Place

Stamp

Here

Name_______________________________

Street_______________________________

City______________State______Zip______

Send a Grizzly Catalog to a friend:

WARRANTY AND RETURNS

Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from

the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse,

negligence, accidents, repairs or alterations or lack of maintenance. This is Grizzly’s sole written warranty

and any and all warranties that may be implied by law, including any merchantability or fitness, for any par-

ticular purpose, are hereby limited to the duration of this written warranty. We do not warrant or represent

that the merchandise complies with the provisions of any law or acts unless the manufacturer so warrants.

In no event shall Grizzly’s liability under this warranty exceed the purchase price paid for the product and

any legal actions brought against Grizzly shall be tried in the State of Washington, County of Whatcom.

We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, special,

or consequential damages arising from the use of our products.

To take advantage of this warranty, contact us by mail or phone and give us all the details. We will then

issue you a “Return Number,’’ which must be clearly posted on the outside as well as the inside of the

carton. We will not accept any item back without this number. Proof of purchase must accompany the

merchandise.

The manufacturers reserve the right to change specifications at any time because they constantly strive to

achieve better quality equipment. We make every effort to ensure that our products meet high quality and

durability standards and we hope you never need to use this warranty.

Please feel free to write or call us if you have any questions about the machine or the manual.

Thank you again for your business and continued support. We hope to serve you again soon.

WARRANTY AND RETURNS

G2790 M

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