Troy-Bilt 600 Series User manual

Service Manual

600 Series AutoDrive Lawn Tractor

MTD Products Inc - Product Training and Education Department

FORM NUMBER - 769-01799

4/2005

NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power

equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.

These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-

enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow

all instructions and use common sense when working on power equipment. This includes the contents of the product’s

Operators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this pub-

lication, although care has been taken to make it as complete and accurate as possible at the time of publication. How-

ever, due to the variety of outdoor power equipment and continuing product changes that occur over time, updates will be

made to these instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing

or repairing a product. The company reserves the right to make changes at any time to this publication without prior notice

and without incurring an obligation to make such changes to previously published versions. Instructions, photographs and

illustrations used in this publication are for reference use only and may not depict actual model and component parts.

Steering Adjustments

IMPORTANT: The front tires will have a "TOE-

IN" between 1/16" and 5/16" to allow the unit to

track properly.

1). Check the tire pressure in the front tires and

make certain that they are at approximately 14

PSI.

2). Place the unit on level ground.

3). Place the steering wheel in the straight forward

position.

4). Lower the deck lift lever to the lowest position.

5). Line up the centering hole in the steering gear

with the centering hole in the support plate, and

insert a 1/4" Phillips screw driver up through

both. See figure 1.

6). In front of the axle, measure the distance hori-

zontally from the inside of the left rim to the

inside of the right rim. See figure 2.

FIGURE 1.

7). From behind the axle, measure the distance hori-

zontally from the inside of the left rim to the

inside of the right rim.

8). The measurement taken in front of the axle

should be between 1/16" and 5/16" less than the

measurement taken behind the axle. If not, per-

form the following steps:

9). Loosen the jam nut at the rear of the right ball

joint that secures the ball joint to the drag link

using a 1/2" wrench and an 11/16" wrench. See

figure 3.

FIGURE 2.

FIGURE 3.

10). Remove the hex nut and lock washer that

secures the right ball joint to the right axle

assembly using a 1/2" wrench and a 9/16

wrench.

11). Remove the right hand ball joint from the right

hand drag link.

12). Remove the left hand ball joint performing steps

9, 10, and 11 above.

13). Place the left and right tire assemblies in the

straight forward position.

14). Set the toe-in for the rim assemblies to the prop-

er measurements as described in steps 6, 7, and

8 above.

15). Thread the right hand ball joint onto the right

hand drag link until the mounting hole in the right

hand axle assembly lines up with the ball joint.

NOTE: Count the number of turns the ball joint

was rotated onto the drag link. This number

should be equal for the left side as well.

Centering

Hole

Jam Nut

Step Through Rider

Adjustments

Variable Speed Drive

16). Secure the right hand ball joint to the right hand

axle assembly with the lock washer and nut

removed earlier, using a 1/2" wrench and a 9/16

socket.

17). Secure the right hand ball joint jam nut to the

right hand drag link using a 1/2" wrench and an

11/16 wrench.

FIGURE 1.

IMPORTANT: The AutoDrive pedal is properly

adjusted when the hole found in the double-idler

bracket has approximately 1-3/8" of travel with

ten pounds of pressure applied to the AutoDrive

pedal. See figures 1 and 2.

Autodrive Pedal Adjustment

1). Locate the speed control assembly on the

underside of the steering support bracket.

2). Remove both hairpin clips from the main pin on

the speed control assembly. See figure 3.

10 Lbs.

Double Idler

Bracket

1-3/8"

FIGURE 2.

FIGURE 3.

NOTE: Be careful not to lose the small flat

washers found on the main pin.

NOTE: Make certain both hairpins are put back

in from the top of the main pin during reassem-

bly.

3). Remove the AutoDrive pedal return spring.

4). Using two 9/16" wrenches, remove the main pin

from the speed control assembly.

5). Thread the idler adjustment rod inward or out-

ward until the proper adjustment has been

achieved.

REASSEMBLE THE AUTODRIVE PEDAL IN THE

REVERSE ORDER ABOVE.

Main Pin

Hairpin

Clips

18). Install the left hand ball joint using steps 15, 16,

and 17.

NOTE: Make certain the same amount of rota-

tions are used on the left ball joint as the right

ball joint.

Variable Speed Drive

Brake Adjustments

IMPORTANT: Make certain the tractor comes to

a complete stop when the brake pedal is

depressed. Also, make certain the rear wheels

do not roll when the parking brake has been

applied. If motion continues, perform the follow-

ing steps:

1). Locate the hex nut that secures the brake

assembly.

2). Loosen (DO NOT REMOVE) the hex nut using a

1/2" wrench.

3). Slide an .011" feeler gauge between the brake

disc and the brake puck. See figure 1.

FIGURE 1.

4). Tighten the hex nut that secures the brake

assembly.

5). Remove the .011" feeler gauge from the brake

assembly.

6). Test for proper adjustments.

Hex Nut

Feeler Gauge

Leveling the Cutting Deck

NOTE: Prior to leveling the mowing deck, per-

form the following steps:

1). Check the tire pressure. The front tires will be

approximately 14 PSI, and the rear tires will be

approximately 10 PSI.

2). Place the tractor on a level surface.

3). Depress and lock the parking brake.

4). Place the cutting deck in cutting position 3 or 4.

FRONT TO REAR ADJUSTMENT:

IMPORTANT: The front of the deck will be

between 1/4" to 3/8" lower in the front than the

rear of the deck.

1). Using a work glove or rag, rotate the blades until

they are parallel with the tractor frame. See

figures 1 and 2.

FIGURE 1.

Variable Speed Drive

2). Measure the front blade tips to ground.

3). Measure the rear blade tips to ground.

4). Make certain the front blade tips are 1/4" to 3/8"

lower in the front than the rear blade tips.

FIGURE 2.

FIGURE 3.

NOTE: If an adjustment is needed, perform the

following steps:

5). Loosen both two jam nuts on the rear side of the

deck stabilizer bracket using a 3/4" wrench. See

figure 3.

FIGURE 4.

Rear Front

Jam Nuts

6). Locate both lock hex nuts on the front side of the

deck stabilizer bracket. See figure 4.

Lock Nuts

7). Tighten both lock hex nuts to raise the front of

the deck or loosen both lock hex nuts to lower

the front of the deck using a 3/4" wrench.

8). Retighten both jam nuts on the rear side of the

deck stabilizer when the proper adjustment has

been achieved.

SIDE TO SIDE ADJUSTMENT:

IMPORTANT: The cutting deck must be even

side to side.

1). Using a work glove or rag, rotate the blades until

they are cutting edge tip to cutting edge tip

(perpendicular) to the tractor. See figure 5.

FIGURE 5.

Variable Speed Drive

FIGURE 6.

2). Measure the outer blade tips to ground. Both

measurements taken should be equal. See figure

FIGURE 7.

4). Rotate the 3/4" deck adjustment gear right or left

until the deck is level side to side and both blade

tips to ground are equal in measurement.

5). Retighten the hex cap screw on the left deck

hanger using a 1/2" and 3/4" wrench when the

proper adjustment has been achieved.

FIGURE 8.

NOTE: If an adjustment is needed, perform the

following steps:

3). Loosen (DO NOT REMOVE) the hex cap screw

on the left deck hanger bracket using a 1/2" and

a 3/4" wrench. See figure 7.

Side

Equal Side

Hex Cap

Screw

NEW ADJUSTMENT DESIGN

Adjustment

Gear

4 - 5

Variable Speed Drive

Deck Belt Removal and Installation

42" CUTTING DECK:

1). Lower the deck to the lowest position.

2). Pull the PTO idler pulley and bracket towards the

discharge chute, relieving belt tension. See

figure 1.

FIGURE 1.

3). Remove the deck belt from the electric PTO

clutch on the engine.

4). Remove the self tapping screws securing the

spindle belt covers. See figure 2.

FIGURE 2.

5). Remove the spindle belt covers.

6). Remove the PTO deck belt.

REINSTALL THE NEW BELT IN THE REVERSE

ORDER ABOVE.

46" CUTTING DECK:

LOWER BELT:

1). Pull the lower deck belt flat idler and idler bracket

towards the left side of the tractor, relieving the

belt tension. See figure 1.

2). Remove the lower deck belt.

REINSTALL THE NEW BELT IN THE REVERSE

ORDER ABOVE.

Electric

PTO

Clutch

Idler

Pull

Screws

Cutting Deck Removal

1). Lower the lift lever to the lowest setting.

2). Pull the PTO idler pulley and bracket towards the

side discharge chute. See figure 1.

FIGURE 1.

Idler

Pull

Electric

PTO

Clutch

Variable Speed Drive

FIGURE 2.

5). Pivot the deck support pins to the rear.

6). Raise the lift lever to the highest setting. This will

raise the lift arms up and out of the way of the

deck assembly.

7). Slide the cutting deck forward and release the

front deck hangers off of the front stabilizer rod.

DO NOT DROP the deck to the ground. See

figure 3.

FIGURE 3.

8). Slide the deck towards the side discharge chute

and remove it from the tractor.

CAUTION: Remove the deck stabilizer assembly

from the tractor prior to moving the unit.

3). Remove the deck belt from the lower pulley on

the engine.

NOTE: The 46" decks have an upper and a

lower belt. The upper belt is removed for cutting

deck removal.

4). Pull the rear deck support pins outward from the

deck lift arms. See figure 2.

Deck Support

Lift

Arm

Front

Stabilizer

Rod

Drive Belt Removal and Reinstallation

TRANSMISSION BELT REMOVAL AND

INSTALLATION:

UPPER BELT:

1). Raise the seat of the tractor and disconnect the

battery cables from the battery. Remove the

negative cable first. See figure 1.

FIGURE 1.

Variable Speed Drive

2). Remove the battery strap, battery, and the

battery tray from the tractor. See figure 2.

FIGURE 2.

3). Raise the deck lift lever to the highest position.

4). Pull the transmission idler pulley towards the

transmission and release the upper drive belt.

See figure 3.

FIGURE 3.

5). Slowly release the idler pulley.

6). Remove the upper drive belt from the transmis-

sion pulley and the variable-speed pulley. See

figure 4.

NOTE: Slowly roll the drive belt off of the

variable-speed pulley.

FIGURE 4.

Upper Drive

Belt

Pull

Upper Drive

Belt

VARIABLE-SPEED BELT REMOVAL AND

REINSTALLATION:

LOWER BELT:

IMPORTANT: Prior to lower variable speed belt

removal, perform cutting deck removal and upper

drive belt removal.

1). Remove the hex bolt and lock nut securing the

variable-speed pulley to the transmission using a

9/16 socket and a 9/16 wrench. See figure 5.

FIGURE 5.

9/16"

Wrench

9/16"

Socket

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