C 7600, 7700 77 4208 3

User Manual: 7600, 7700

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Model 7600/7700

Tire Changer

Operators Manual

Form 77-4208-3

I. INSTALLATION

1. Remove carton, blocks, and machine pro-

tection.

2. Remove tire changer from shipping pallet

(optional).

3. Inspect for any possible shipping damage.

4. Connect 3/8" air supply line to 150 psi

source. A minimum of 120 p.s.i. (maximum

of 180 p.s.i.) is required at machine. Do not

place hands near machine, because it will

cycle when air is applied. To extend the ser-

vice life of the air operated components, the

addition of a Filter/Oiler is recommended.

FMC offers the Air Filter Kit under part no.

66495.

5. Cycle machine and ensure smooth opera-

tion in both forward and reverse directions of

travel. Check air blast and air inflation opera-

tions with deflated tire on the table.

CAUTION: STAND CLEAR OF THE AIR

BLAST RING ON THE TABLE IF AIR

BLAST CAPABILITY IS BEING TESTED

WITHOUT A TIRE/WHEEL OVER IT. THE

AIR SYSTEM MAY CONTAIN FOREIGN

PARTICLES.

6. Install bracket, Lube Bottle, and Brush. Add

approved tire lube mixture to the lube bottle

at this time.

7. Check the location of the stub of the cen-

ter shaft when at rest. It should point to the

right-hand corner of the table for operator con-

venience. It should always return to this lo-

cation at the end of a complete cycle.

MODEL 7600/7700 TIRE CHANGER

OPERATORS MANUAL

TABLE OF CONTENTS

I. INSTALLATION

II. BEAD LOOSENING AND

DEMOUNTING

III. TIRE MOUNTING

IV. TIRE INFLATION

V. SPECIAL WHEELS

VI. MAINTENANCE INSTRUCTIONS

VII. SPECIFICATIONS

VIII. TROUBLESHOOTING THE

7600/7700

8. Check that standard accessories are on

hand. Current list is as follows:

66009 Pin extension weldment

66008 Shaft extension weldment

66181 Dismount boot

66182 Mounting boot

II. BEAD LOOSENING AND

DEMOUNTING

Place the tire and wheel on the conical table

with the narrow side of bead seat up and with

tire valve located on operator’s side of the

machine at 6 o’clock. Secure with locator

positioning pin. Thread the hold-down cone

clockwise on center post. As the tapered end

of the cone enters the rim center hole, the

wheel will adjust itself onto the conical top.

Be sure the hold-down cone is hand tight and

is centered in the rim.

Set the adjustable knob under the lower shoe

to the correct height according to the label

on top of the shoe. On earlier models, insert

one of the two buttons in the hole provided

under the lower shoe.

Add the lower shoe extension if you are de-

mounting a wheel with deeper than usual drop

center. Care should be taken on wheels that

have shallow drop center.

With Alloy Wheels, use the Econo-Mag or one

of the Mag Cushions to secure the wheel. The

hold-down cone centers the wheel. Rubber

spacer ring(s) may be necessary for mount-

ing some wheels. Install the cushion between

hold-down cone and wheel. Using the air in-

flation valve, pressurize the tire to 60 psi (pop-

off valve will exhaust at 60 psi). The Mag

Cushion spreads an equal load over wheel

to prevent any breakage. (See note about

alloy accessories). To deflate a Mag Cush-

ion, simply attach air chuck and press air re-

lease valve.

Remove valve core to deflate tire. Place up-

per bead breaker approximately one inch

away from bead and rim, taking care that the

shoe does not contact the rim.

fig 1

fig 2

Press down on foot pedal and the upper and

lower bead breakers will follow an arc to con-

tact upper bead and loosen it. Simulta-

neously, the lower bead breaker will rise and

loosen bottom bead.

Should upper bead breaker engage rim, stop

operation and move bead breaker back ac-

cordingly.

After loosening beads, apply a liberal amount

of rubber lubricant before demounting tire

from rim. The lubricant makes tire removal

easier and helps to protect the beads. Lubri-

cant should be used to prevent bead dam-

age during mounting/demounting operations.

CAUTION Stabilize combination tool with

Free hand to prevent it from becoming dis-

engaged from the center post and striking

operator or bystander.

Insert combination tool between the upper

bead and rim and align tool with centerpost.

Place combination tool over the center post

and step on the foot pedal. Use left hand to

pull up on tire to help remove it from the rim.

Center post will power the combination tool,

thus removing the upper bead. Repeat for

lower bead removal.

Remove tool from center post before releas-

ing foot pedal at the end of each stroke. When

handling narrow or wide diameter wheels,

limit the stroke to avoid engaging drop cen-

ter of rim.

The dual power capability of the 7600/7700

is utilized fully when mounting or demount-

ing tires onto or off of standard steel rims.

fig 3

fig 4

fig 5

With the standard steel rims, you can realize

the full stroke and power potential of the 7600/

7700 in both directions. This feature allows

you to work with the tire/wheel on every

stroke, thus reducing wasted effort.

Use nylon rim protectors when mounting/de-

mounting Alloy Wheels.

With tube-type wheel, do not extend combi-

nation tool any farther than necessary beyond

bead.

III. TIRE MOUNTING

Place the wheel on table with the valve stem

facing the operator (near 6 o’clock) and cen-

tering pin in a lug hole. Secure tire with a hold-

down cone or Mag Cushion.

Check the height setting of the lower shoe to

prevent it from damaging the rim.

If your machine has the removable lower shoe

feature, you might want to remove the lower

shoe during the tire mounting

process. The lower shoe serves no purpose

during the mounting of a tire.

Apply a liberal amount of lubricant as the first

step in mounting a tire.

Lubrication makes tire mounting easier and

helps protect beads. Also, before mounting

tire, inspect the rim for damage that could

affect bead seating.

Place tire to be mounted over the rim and at

angle indicated. Hook the Combination tool

over the rim and place slot over the center

post. Rotate tire clockwise until the bead is in

the groove on the combination tool and the

lower bead is in the drop center of the wheel.

Using your left hand, push down on the tire

at the 7 o’clock position and step on the foot

pedal. Press down on the right side of the

tire with your right hand and release the pedal.

With your free hand resting on the combina-

tion tool, let the tool rotate and it will install

the tire on the rim. Hold your foot on the pedal,

remove the tool from the tire, and place it over

the edge of the wheel. Double beading tires

is not recommended; however, can be done

for most tire mounting applications.

fig 6

fig 7

IV. TIRE INFLATION

Connect the air inflation chuck to the valve

stem with the valve core removed.

Holding the tire as shown, lift up and rotate

so the top bead is against the rim and par-

ticularly ensuring the top bead is above the

valve stem. Do not hang over the changer.

Step on the air inflation pedal to full extent

and hold approximately one second. This will

deliver a high velocity burst of air from the

inflate tube jets, which will seat beads. As

soon as beads seat, release the pedal and

loosen the hold-down cone.

Remove air inflation chuck and install valve

core, then press the foot pedal half way to

complete inflation of the tire.

During inflation, frequently release the pedal

to read pressure gauge. DO NOT OVER IN-

FLATE. If too much pressure is put into the

tire, it can be bled down by pressing the re-

lieving valve on operators left.

CAUTION: If beads do not seat at 40 psi,

deflate the tire and re-lubricate beads. Do not

exceed tire manufacturers recommended air

pressure when inflating.

V. SPECIAL WHEELS

The 7600/7700 can easily be set up to handle

most specialty wheels and the big GM front-

wheel drive cars (Eldorado, Toronado, &

Riviera), using accessories that are supplied

as standard. The lower shoe angle can be

adjusted by simply turning a threaded knob

below the shoe.

Earlier models were supplied with two lengths

of insertable buttons that raised the lower

shoe to different heights - some even earlier

units came with a bead loosening shim for

use with wide flange alloy wheels.

Econo-Mag or Mag Cushion and accessories

should be used for holding alloy rims to the

changer.

fig 8

fig 9

fig 10

Extensions are also supplied to extend the

length of the lower shoe, the height of the

center shaft, and the locator pin, Nylon rim

protectors are also supplied for use with the

combination tool when handling alloy or

chrome wheels.

Many other options are available if needed.

Consult the Tire Changer Accessory Catalog

or contact the nearest FMC sales Represen-

tative, Distributor, or Field Service Technician.

VI. MAINTENANCE INSTRUCTIONS

1. LUBRICATION - periodically remove the

side panels and lubricate pivot pins, & rack

and pinion.

The recommended greases are:

Franklin Oil Corp MTS-1000

Franklin oil H-80 Moly grease

Dow Corning MolyKote 165 open gear lube

Dow Corning MolyKote 299 open gear lube

Dow Corning MolyKote G-Plus paste

Dow Corning MolyKote G paste

2. LOWER SHOE - If equipped with a remov-

able shoe, inspect the condition of shoe re-

taining parts. Replace as necessary.

3. CYLINDER OIL - Stroke of lower bead

breaker should be 6-1 /2". A shorter stroke

may be due to a loss of hydraulic oil (the

power transfer fluid enclosed between the two

cylinders.) Should hydraulic oil appear around

the valve assembly, contact your service rep.

or cylinder repair. Otherwise, hydraulic oil

can be added to the system through the “T”

plug on top of the lower cylinder. Hydraulic

oil must be non-foaming and non-detergent.

The following is a list of preferred oils:

Esso Univis H42

Exxon Univis P32

Exxon Univis J26

SunOil 2105

Mobil Oil D.T.E. 25

4. AIR VALVES AND HOSES - Inspect peri-

odically for air leaks and for presence of wa-

ter or hydraulic oil. Contaminates in the air

system will, if left undetected, tend to cause

“O”rings and valves to deteriorate.

5. LOSS OF POWER - Check:

(a) Air supply - should be 150 psi through

3/8" line.

(b) Air lines for obstruction or leak, or air cyl-

inders for leakage.

(c) Air valves and mufflers (on 4-way valve) -

should be functioning properly with no restric-

tions. Clogged mufflers will

cause a restricted air system, thus slow the

machine down and eventually stop it. Re-

place as necessary.

WARNING: Tire or wheel failure under

pressure can be hazardous. Inspect tire

and wheel carefully for wear or defects

before seating or inflating. Never inflate

tire beyond the tire industry recommen-

dation of 40 psi. Always lubricate with

approved rubber lubricant and never dam-

age tire beads. Keep hands and entire

body back from inflating or inflated tire.

1. Never stand with any part of the body over

a tire during the inflation process.

2. Before starting, release all air from the tire.

3. Place rim with narrowest bead-seat or

flange up.

4. Position tire with valve directly in front of

operator.

5. Hand tighten hold-down cone over adapter

before breaking bead - mounting or demount-

ing.

6. Use approved lubricant on all beads be-

fore breaking over or seating beads.

7. On air inflate unit, depress foot pedal only

when seating or inflating tire.

8. Loosen hold-down cone one full turn im-

mediately after obtaining initial bead seat, and

before attempting further inflation.

9. To seat beads, use a small amount of in-

termittent air. Never exceed 40 psi.

10. During inflation, frequently observe pres-

sure at air gauge and avoid distraction to pre-

vent over-inflation.

VII. Specifications

Rim Diameter:

11.0 - 17" (254-455mm)

Rim Width:

3.0 - 19.75" (76-483mm)

Air Supply (operating range:)

120 - 180 PSI (825-1 238kPa)

Center Post Torque

450 ft. Ibs @ 120 psi

650 ft. Ibs @ 175 psi

(62kgm@825kga, 90kgm @ 1205kPa)

Cylinders:

Two 7" diam. x 6.5" stroke

(177.9mm x 165.1mm)

Surge Tank:

(ASME approved): 10"diam. x

18.75"high (254mm x 476mm):

0.75 cu ft. (21.25L)

Cycle Time:

6 seconds (complete forward and re

verse stroke)

Forward & Return Power

Air-hydraulic

Mount & Demount Capability

Both forward and reverse strokes

Unit Dimensions:

22" x 54.5" x 44"

(0.53m x 1.38m x 1.11 m)

Shipping Volume:

39 cu ft (1.1m3)

Shipping Weight:

500 Ibs (225kg)

NOTE: FMC Corporation reserves the right

to incorporate changes in designs or ma-

terials, affecting product improvements,

without obligation of incorporating same

on equipment of prior manufacture.

7600/7700 Troubleshooting Chart

Possible Causes

Clogged mufflers or 4-way valve

Restricted air line

Low air supply pressure

Leaking dump valve

Air line leak to 4-way valve input

Defective "O" rings in 4-way valve

Defective 4-way valve

Leaking dump valve

Defective pop off valve

Air in hydraulic system

Clogged muffler in lower cyl

exhaust path.

Defective "O" ring in 4-way valve

Leak in air line to lower cylinder

Defective "O" ring cap seal on cyl.

Clogged muffler in upper cyl

exhaust return.

Defective "O" ring in 4-way valve

Leak in air line to upper cylinder

Defective "O" ring cap seal on cyl.

Low on hydraulic fluid

Leak in hydraulic pressure hose

Defective "O" ring cap seal on cyl.

Air in hydraulic system

Lost hydraulic fluid

Defective Hydraulic pressure hose

Defective cylinder cap "O" ring

Broken center shaft

Defective pinion gear

Defective rack wear pad

Worn our DU bearing

Worn out Nyliner bushing

Badly worn pinion gear

Badly worn rack

Air in hydraulic system

Action

Replace mufflers - clean 4-way valve

Clean out or replace

Check compressor & supply line

Replace

Repair fitting/replace line

Replace rings or 4-way valve

Clean, rebuild or replace

Replace

Replace & check air pressure

Call for Service

Replace mufflers

Replace rings or 4-way valve

Repair fitting/replace line

Call for Service

Replace mufflers

Replace rings or 4-way valve

Repair fitting/replace line

Call for Service

Add hyd. fluid at upper cylinder

Tighten clamps or call for service

Call for Service

Call for Service

Call for Service

Call for Service

Call for Service

Replace center shaft, nyliner, DU

Replace pinion gear, pin or both

Replace rack or wear pad

Replace DU bearing

Replace Nyliner bushing

Replace pinion Gear - check wear pad

Replace rack - check pinion

Call for Service

Symptom

1. Stroke becoming slower

2. Decreased shaft power in both

directions

3. Decreased power in forward

stroke only

4. Decreased power in reverse

stroke only

5. Decreased stroke (shaft

travel)

6. Center shaft & cylinders will

not move

7. Center shaft will not rotate,

but breaker operates normally.

8. Center shaft loose

9. Lower shoe "creeps up" after

normal stroke