680SD OM O_gw_680_760 O Gw 680 760

User Manual: o_gw_680_760

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OPERATOR’S

MANUAL

Set-Up Instructions and Parts Catalog for

Model 680SD or 760SD Gravity Box

680 or 760 Bushel Capacity
Short Turn Design
For 24 Ton Running Gears

J. & M. Manufacturing Co., Inc.
P.O. Box 547
Fort Recovery, OH 45846
Phone: (419) 375 2376 Fax: (419) 375-2708
E-mail: sales@jm-inc.com Website: www.jm-inc.com
REV-03-12-09

Pg. 1

TO THE DEALER:
Read manual instructions and safety rules. Make sure all items on the Dealer’s Pre-Delivery and Delivery Check
Lists in the Operator’s Manual are completed before releasing equipment to the owner.
The dealer must complete the Warranty Registration Card attached to the front inside cover of this manual and return
to J. & M. Mfg. Co., Inc. at the address indicated on the card. Warranty claims will be denied if the Warranty
Registration Card has not been completed and returned.
EXPRESS WARRANTY:
J. & M. Mfg. Co. Inc. warrants against defects in construction or materials for a period of ONE year. We reserve the
right to inspect and decide whether material or construction was faulty or whether abuse or accident voids our
guarantee.
Warranty service must be performed by a dealer or service center authorized by J. & M. Mfg. Co. Inc. to sell and/or
service the type of product involved, which will use only new or remanufactured parts or components furnished by J.
& M. Mfg. Co. Inc. Warranty service will be performed without charge to the purchaser for parts or labor based on the
Warranty Labor Times schedule. Under no circumstance will allowable labor times extend beyond the maximum
hours indicated in the Warranty Labor Times schedule for each warranty procedure. The purchaser will be
responsible, however, for any service call and/or transportation of the product to and from the dealer or service
center’s place of business, for any premium charged for overtime labor requested by the purchaser, and for any
service and/or maintenance not directly related to any defect covered under the warranty. Costs associated with
equipment rental, product down time, or product disposal are not warrantable and will not be accepted under any
circumstance.
Each warranty term begins on the date of product delivery to the purchaser. Under no circumstance will warranty be
approved unless (i) the product warranty registration card (attached to the inside of the Operator’s Manual) has been
properly completed and submitted to the equipment manufacturer. This Warranty is effective only if the warranty
registration card is returned within 30 days of purchase.
This warranty does not cover a component which fails, malfunctions or is damaged as a result of (i) improper
modification or repair, (ii) accident, abuse or improper use, (iii) improper or insufficient maintenance, or (iv) normal
wear or tear. This warranty does not cover products that are previously owned and extends solely to the original
purchaser of the product. Should the original purchaser sell or otherwise transfer this product to a third party, this
Warranty does not transfer to the third party purchaser in any way. J. & M. Mfg. Co. Inc. makes no warranty, express
or implied, with respect to tires or other parts or accessories not manufactured by J. & M. Mfg. Co. Inc. Warranties
for these items, if any, are provided separately by their respective manufacturers.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES OR CONDITIONS, EXPRESS,
IMPLIED OR STATUTORY, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
PARTICULAR PURPOSE.
In no event shall J. & M. Mfg. Co. Inc. be liable for special, direct, incidental or consequential damages of any kind.
The exclusive remedy under this Warranty shall be repair or replacement of the defective component at J. & M. Mfg.
Co. Inc’s. option. This is the entire agreement between J. & M. Mfg. Co. Inc. and the Owner about warranty and no J.
& M. Mfg. Co. Inc. employee or dealer is authorized to make any additional warranty on behalf of J. & M. Mfg. Co.
Inc.
The manufacturer reserves the right to make product design and material changes at any time without notice. They
shall not incur any obligation or liability to incorporate such changes and improvements in products previously sold to
any customer, nor shall they be obligated or liable for the replacement of previously sold products with products or
parts incorporating such changes.
SERVICE:
The equipment you have purchased has been carefully manufactured to provide dependable and satisfactory use.
Like all mechanical products, it will require cleaning and upkeep. Lubricate the unit as specified. Observe all safety
information in this manual and safety signs on the equipment.
For service, your authorized J. & M. dealer has trained mechanics, genuine J. & M. service parts, and the necessary
tools and equipment to handle all your needs.
Use only genuine J. & M. service parts. Substitute parts may void the warranty and may not meet standards required
for safe and satisfactory operation. Record the model number and serial number of your equipment in the spaces
provided:
Serial # ___________ Purchase Date: _______ Purchased From: ____________________________________
Please provide this information to your dealer to obtain the correct parts:

Pg. 2

MODEL 680SD and 760SD GRAVITY BOX
Dimensions

680SD

760SD

16’-6”

8’-7”

10’-2”

10’-10”

7’-8”

11’-2”

9’-6”

24’-0”

1’-5”

C
H
D

Specifications
Capacity

680 or 760 bushels

Door Width

48”

Chute Height

Adjustable (14” to 19”)

Understructure

9 GA 3” x 6” Tubing

Taillights

Standard

Front Ladder

Standard

A
B

Center Diverter Chute

Optional

Hydraulic Drum Brakes

4 Wheel (recommended)

Hopper Construction

12 GA

Weight (with running gear)

6,800 lbs (680SD) or 7,050 lbs (760SD)

E
G

GENERAL INFORMATION
TO THE OWNER:
The purpose of this manual is to assist you in operating and maintaining your running gear in a safe
manner. Read it carefully. It furnishes information and instructions that will help you achieve years of
dependable performance and help maintain safe operating conditions. If this machine is used by an
employee or is loaned or rented, make certain that the operator(s), prior to operating:
1. Is instructed in safe and proper use.
2. Reviews and understands the manual(s) pertaining to this machine.
Throughout this manual, the term IMPORTANT is used to indicate that failure to observe can cause
damage to equipment. The terms CAUTION, WARNING and DANGER are used in conjunction with the
Safety-Alert Symbol, (a triangle with an exclamation mark), to indicate the degree of hazard for items of
personal safety. When you see this symbol, carefully read the message that follows and be alert to the
possibility of personal injury or death.
This Safety-Alert symbol indicates a hazard and means
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
Indicates an imminently hazardous situation that, if not avoided, will
result in death or serious injury.
Indicates a potentially hazardous situation that, if not avoided, could
result in death or serious injury, and includes hazards that are exposed
when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, may result
in minor or moderate injury.
Indicates that failure to observe can cause damage to equipment.
Indicates helpful information.

Pg. 3

GENERAL INFORMATION (continued)
BOLT TORQUE CHART
Always tighten hardware to these values unless a different torque or tightening procedure is listed for a
specific application.
Fasteners must always be replaced with the same grade as specified in the manual parts list.
Always use the proper tool for tightening hardware.
hardware.

SAE for SAE hardware and Metric for metric

Make sure fastener threads are clean and you start the thread engagement properly. All torque values
are given to specification used on hardware defined by SAE J1701 & J1701M (Jul 96).

Pg. 4

TABLE OF CONTENTS
INTRODUCTION

EXPRESS WARRANTY

SPECIFICATIONS

GENERAL INFORMATION

BOLT TORQUE CHART

SAFETY SIGNS

SAFETY RULES

OPERATING INSTRUCTIONS / MAINTENANCE

PARTS LIST / DIAGRAM

8-10

LIGHT KIT

11-12

SERVICE RECORDS

SAFETY SIGNS
IMPORTANT: Install new safety signs if the old signs are destroyed, lost, painted over or cannot be read.
When parts are replaced that have safety signs, make sure you install a new sign with each new part.
New signs are available from the manufacturer or your authorized dealer.

Item #
1
2
3

Part #
DD-101
DC-109
DI-114

Description
Danger: Flowing Grain
Caution: Fasten Box / Highway Travel
J&M Oval - Large

Pg. 5

SAFETY RULES
ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
Safety is a primary concern in the design and manufacture of our products. Unfortunately, our efforts to
provide safe equipment can be erased by an operator’s single careless act. In addition, hazard control
and accident prevention are dependent upon the awareness, concern, judgment, and proper training of
personnel involved in the operation, transport, maintenance and storage of equipment.
Make certain that the operator(s), prior to operating is instructed in safe and proper use and reviews and
understands the manual(s) pertaining to this machine.
Read this manual before you operate this machine. If you do not understand any part of this manual, or
need more information, contact the manufacturer or your authorized dealer.

SAFETY
Understand that your safety and the safety of other persons are measured by how you service, and
operate this machine. Know the positions and functions of all controls before you try to operate them.
Make sure to check all controls in a safe area before starting your work.
The safety information given in this manual does not replace safety codes, federal, state or local laws.
Make certain your machine has the proper equipment as designated by local laws and regulations.
A frequent cause of personal injury or death is from persons falling off equipment and being run over. Do
not permit persons to ride on this machine.
Travel speeds should be such that complete control and machine stability is maintained at all times.
Where possible, avoid operating near ditches, embankments and holes. Reduce speed when turning,
crossing slopes and rough, slick or muddy surfaces.
Collision of high speed road traffic and slow moving machines can cause personal injury or death. On
roads, use flasher lights according to local laws. Keep slow-moving-vehicle emblem visible. Pull over to
let faster traffic pass.
Never adjust, service, clean, or lubricate gravity box until all power is shut off.
Keep all safety shields in place. Keep hands, feet, hair and clothing away from moving parts while unit is
in operation.
The service ladder is for service work only. If you must climb into the grain tank, be certain that all power
is shut off and then use extreme caution when climbing into the grain tank. Never allow anyone in, near
or on the gravity box during transporting or unloading grain. Moving grain is dangerous and can cause
entrapment, resulting in severe injury or death by suffocation.
Make sure that everyone is clear of equipment before applying power or moving the machine.
Make sure that the implement is fastened securely to the tractor by using the proper hitch pin, clip and
safety chains. Make sure the gravity wagon is properly fastened to the running gear.
Never overload the wagon. Overloading the wagon is dangerous and can cause extensive damage.
Never add more sideboards to the gravity box than what is recommended, as the box is not designed to
carry the additional weight. Do NOT exceed speeds in excess of 20 MPH. Rim, hubs and bearings are
designed for heavy loads at slow speeds. Also be sure slow moving vehicle emblem is attached to rear
of wagon.
Before unhooking the implement from the towing unit, be sure to properly block the wheels to prevent the
implement from moving.

Pg. 6

OPERATION INSTRUCTIONS / /MAINTENANCE
WARNING - BE CERTAIN THAT ALL POWER IS SHUT OFF BEFORE SERVICING EQUIPMENT.
Before equipment is put into service:
Has the track assembly (door opener) been lubricated for less wear on the sprocket and track and for
easier door operation?
Has the SMV (Slow Moving Vehicle) Emblem been positioned with a point of the triangle upward and as
near to the rear and centered or as near to the left of center of the unit as practicable? Is it located two to
ten feet above the ground measured from the lower edge of the emblem?
Has the gravity box been properly attached to the running gear? If no rocking bolster is used, bolt all four
corners (use the 1/2” bolts provided) of the gravity box runners to the running gear. If the box is used in
rough terrain, bolt a minimum of two corners and chain (or cable) the remaining corners to allow more box
flexibility.
Have all braces, bolts, nuts, lug bolts and lug nuts been checked to ensure they are properly fastened?
Have all safety instructions been read and clearly understood by the operator(s) of this machine?
Do the lights work properly? Are all reflective decals clean and visible? Are they positioned correctly?
BRAKING SYSTEM REQUIREMENTS:
WARNING - Tow Loads Safely
Stopping distance increases with speed and weight of towed loads, and on slopes. Towed loads with or
without brakes that are too heavy for the tractor or are too fast can cause loss of control. Consider the
total weight of the equipment and its load.
For towed equipment WITHOUT brakes, the following is recommended:
Do NOT tow equipment that does not have brakes at speeds over 32 km/h (20 mph); or that,
when fully loaded, has a mass (weight) over 1.5t (3300 lb) and more than 1.5 times the mass
(weight) of the towing unit.
For towed equipment WITH brakes, the following is recommended:
Do NOT tow equipment that has brakes at speeds over 40 km/h (25 mph); or that, when fully
loaded, has a mass (weight) more than 4.5 times the mass (weight) of the towing unit.
Ensure the load does not exceed the recommended weight ratio. Use additional caution when towing
loads under adverse conditions, when turning and on inclines.
WARNING
Before filling the gravity box, make certain that no one is inside the grain tank. Never allow children or
anyone in, near or on the gravity box during transport or during loading or unloading of grain. Be aware
that moving grain is dangerous and can cause entrapment, resulting in severe injury or death by
suffocation.
After hauling corrosive material such as fertilizers, be sure to wash out the grain tank to prevent
premature rusting. Bare spots on metal should be primer coated before applying the outer surface paint.
Check the box periodically for cracks in welds and for other structural damage. Have cracked welds fixed
immediately. Failure to do so could result in extensive damage and greatly reduce the life of the gravity
box.

Pg. 7

MODEL 680SD and 760SD REPAIR PARTS LIST
Sideboard Installation
Note: Sideboards, Endboards,
Corners and Sideboard Braces
are used only on 760SD Gravity
Box.
Gravity Box Parts List
#

Part #

Description

LL-8

Ladder

C-8

Corner for 8” Sideboard

S-8166

Sideboard, 8” x 16’-6”

E-896

Endboard, 8” x 9’ 6”

CB-760

Center Brace

IWK-1

Inspection Window Kit

S-760-8

Set of Sideboards Complete

CWA-540

Complete Wheel Assembly

31617-CS

3/16” x 17” Chain Assembly

381-HBN-f

3/8” x 1” Flange Bolt with Nut

12FLW

Large Flat Washer

Divider Gravity Box Parts List
#

Part #

Description

LL-8

Ladder

C-8

Corner for 8” Sideboard

S-8166

Sideboard, 8” x 16’-6”

E-896

Endboard, 8” x 9’ 6”

DB-896

Center Divider Board

IWK-1

Inspection Window Kit

DBB-8

Divider Board Bracket

CWA-540

Complete Wheel Assembly

31617-CS

3/16” x 17” Chain with S-Hook

381-HBN-F

3/8” x 1” Flange Bolt with Nut

12LFW

Large Flat Washer

Rocking Bolster Assembly
#

Pg. 8

Part #

Description

URB-680

Upper Rocking Bolster

346G5BLN

3/4” x 6” Grade 5 Bolt with
Lock Nut

34-LW

3/4” Large Washer

78812-BNW

7/8” x 8 1/2” Bolt with Nut

78-LW

7/8” Large Washer

MODEL 680SD and 760SD REPAIR PARTS LIST
Door, Chute and Inspection Window
#

Part #

Description

D-680

Metering Door
Grain Chute

GC-680

381-HBN-F

3/8” x 1” Flange Bolt with Nut

38-FW

3/8” Flat Washer

38-LW

3/8” Large Washer

CTE-LP

Lynch Pin

ACB-1

Adjustable Chute Bracket

Gear Reduction Wheel Assembly
#

Part #

Description

TCA-28

Track and Chain Assembly

10T50B

10 Tooth Sprocket

38TSS

38 Tooth Sprocket and Shaft

15TSS

15 Tooth Sprocket and Shaft

TS-1

Roller with Bronze Bushing

BB-34

3/4” Bronze Bushing

RMP-1

Rear Mounting Plate

FCP-1

Front Cover Plate

WPS-1

Wheel, Pin and Strap Assy

DLR-1

Door Locking Rod

381-HBN-F

3/8” x 1” Flange Bolt with Nut

141HBLN

1/4” x 1” Hex Bolt w/ Lock Nut

38134-HBN

3/8” x 1 3/4” Hex Bolt with Nut

REC-1

Rubber End Cap

14112RP

1/4” x 1 1/2” Roll Pin

Pg. 9

MODEL 680SD and 760SD REPAIR PARTS LIST
Center Diverter Chute Assembly Instructions
1. Locate the plates on both underneath sides of the door. There is a
3/8” tapped hole located on each plate. Attach the Center Diverter
Chute using one 3/8” hex bolt, washer and lock nut as shown.

3/8” Nut
3/8” Bolt

3/8” Tapped Hole
Side Dump
Chute
Box Plate

Center Diverter
Chute

Diverter Chute

Insert the 3/8” bolt through the pre-punched hole in the chute. Thread the nut onto the bolt until
approximately half of the threads are exposed. Screw the bolt through the pre-tapped hole in the plate
under the gravity box until the nut is against the plate. This allows the bolt to be used as a pivot so the
center diverter chute can swing freely.
2. Lift the Side Dump Chute up into
storage position. Rotate the Center
Diverter Chute up against the Side
Dump Chute. Extend the chain on the
Center Diverter Chute up to the center
of the Side Dump Chute so the chain is
tight. Mark and drill one 3/8” hole in the
Side Dump Chute and attach the chain
a couple of links from the end using one
3/8” stove bolt and nut. Be sure to
position the head of the stove bolt on
the inside of the Side Dump Chute.

Attach the chain of
the Center Diverter
Chute to the Side
Dump Chute

Pg. 10

GRAVITY BOX LIGHT KIT REPAIR PARTS LIST

PARTS LIST
#

Part #

Description

7-WCE

7-Wire Connector End

7-WNB

7-Wire Nose Box

WH-1

Main Wiring Harness

LH-1

Light Harness

LE-1B

Light Enhancer

LT-R1

Red Light

LT-A1

Amber Light

PG-1L

Plastic Grommet

RD-A1

Amber Reflective Decal

RD-R1

Red Reflective Decal

RD-O1

Orange Reflective Decal

141-CB

1/4” x 1” Carriage Bolt

14-FN

1/4” Flange Nut

181-HB

1/8” x 1” Hex Bolt

18-HB

1/8” Hex Nut

1434SDST

1/4” x 3/4” Self-Tapping Screw

WLC-1

Wire Loom Clamp

SMV-2

Slow Moving Vehicle Emblem

WHB-1

Wire Harness Storage Bracket

RCW-1

Rubber Cap for Bracket

OFL-1

Flood Light

IMPORTANT: Position the SMV Emblem with a point of the
triangle upward and as near to the rear and centered or as
near to the left of center of the unit as practicable. The SMV
Emblem should be located two to ten feet above the ground
measured from the lower edge of the emblem.
SECURING THE WIRE HARNESS
STORAGE BRACKET

Place the wire harness storage bracket against the front
face of the gravity box. Secure the bracket using two 1/4” x
3/4” Self-Tapping Screws. Slide the Rubber End Caps over
each end of the Wire Harness Storage Bracket. Securely
wrap the Main Wiring Harness around the bracket for
storage. To prevent injury, do NOT secure the storage
bracket along the side of the ladder.

Part #

Description

OMSC-1

Owners Manual Storage Container

141CB

1/4” x 1” Carriage Bolt

14WN

1/4” Whiz Nut

WG-2

Wire Guard for Rear Lights

RL-1AB

Replacement Lens (amber)

RL-1RB

Replacement Lens (red)

Pg. 11

GRAVITY BOX LIGHT KIT SET-UP INSTRUCTIONS:
Slide the Main Wiring Harness 7-Prong Connector End through the lower front end of the gravity wagon
toward the hitch. The black and white wire and 7-Wire Nose Box should run to the back end of the gravity
box through the steel runner or conduit.
Place the black Plastic Grommet around the circular cut-out of the Front Angle Bracket.
Secure the black and white wire along the steel runner to the door opening of the gravity box for the door
light.
Drill two holes in the rear leg of the gravity box and secure the Light Enhancer on the inside face of the
leg using two 1/8” x 1” Hex Bolts and Nuts. (Note: The Light Enhancer should be mounted so the wire
connectors hang from the enhancer box.)
Slide the bolt head of one 1/4” x 1” Carriage Bolt through each of the two slots located on the rear side of
each light. The bolt pattern should correspond to the hole pattern on the rear leg of the gravity box.
Place the light wire through the hole provided on the rear leg, then slide the bolts through the two holes
on the rear leg. Set the Wire Guard on the inside face of the rear leg and secure to the 1/4” x 1” Carriage
Bolt using the 1/4” Flange Nut. Repeat for each light. (Note: When mounting the red and amber lights to
the gravity box, the Red Light should be mounted above the Amber Light on each side.)
Connect the Light Wiring Harness to the Light Enhancer and the red and amber lights on the adjacent
rear leg. To connect the opposite side red and amber lights, run the Light Wiring Harness along the
gravity box bracing connecting the steel runners. Secure the Light Wiring Harness using the three Wire
Loom Clamps and Self Tapping Screws.
Place one amber reflective decal at each extreme end of both sides
and front of the gravity box as shown. Place one red and one
orange reflective decal at each extreme end of the rear of the gravity
box as shown. The red decal should be placed above the orange
decal.
Mount the Operator’s Manual Storage Container using two 1/4” x 1”
Carriage Bolts and 1/4” Flange Nuts to the inside face of the front leg
of the gravity wagon as shown.
Read and understand all the information in the Operator’s Manual
BEFORE you operate this machine. Keep the Operator’s Manual in the Storage Container and reference
the manual as required.

Pg. 12

SERVICE / MAINTENANCE RECORD
Date

Description

Notes

Pg. 13

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