Troy-Bilt 753 Manuale utente

Service Manual

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

PRINTED IN USA FORM NO.769-00945

This Service Manual is not a substitute for the Operator’s Manual. You must read, understand

and follow all of the directions in this manual as well as the Operator’s Manual before working

on this power equipment.

(10/2003)

753 Wide Cut Mower

TROY-BILT LLC, P.O. BOX 361131, CLEVELAND, OH 44136-0019

NOTE: These materials are for use by trained technicians 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 inexperienced 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 publication, although care has been taken to

make it as complete and accurate as possible at the time of publication. However, 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

MTD Products LLC - Product Training and Education Department

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

TROY-BILT WIDE CUT MOWER

Model 12A-E753B063 (NEW)

• 9 hp briggs & Stratton I/C OHV engine

• Electric Start

• 33” Deck

• Self-Propelled Multiple Speed Gear Drive

• Peerless Transaxle

• BLade Brake Clutch

• Automatic Parking Brake

• Single Lever Height Adjustment

• 3-in-1 Capacity

The Model E753B features a standard size battery and

electric start. See Figure 1.

Figure 1

Gas Tank

Battery

The key switch is located on the right side of the con-

sole. See Figure 2.

The unit also features an oversize fuel tank with a man-

ual shutoff valve. See Figure 3.

Figure 2

Key Switch

Figure 3

Fuel Shutoff

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

Includes update Information for older models

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

The fuse is located on the right side next to the battery

and the solenoid is mounted on the battery support

bracket under the battery. See Figure 4.

Most electrical problems can be diagnosed using a

ohm meter and checking continuity of the ignition

switch and wires to each component. See Figure 5.

NOTE: The Operator’s Manual that comes with

the unit has a wealth of information regarding

the setup, operation and servicing of this unit.

NOTE: This Service Manual is a supplement to

the Operator’s Manual.

IMPORTANT: Please read, understand and fol-

low all safety procedures listed in the Operator’s

Manual when working on this unit.

CAUTION: Before servicing the unit place it on a

level surface, turn off the engine and let the unit

cool, and disconnect the spark plug wire. On

electric start units, make sure the key is in the

“off” position.

1. BLADE DRIVE BELT REMOVAL

1.1. Make sure the blade drive control is disen-

gaged.

1.2. Using a ½ inch socket remove the four screws

securing the belt cover and removed the cover.

See Figure 6.

1.3. Using a ½ inch socket, remove the two screws

attaching the flap bracket to the frame. Remove

the flap bracket. See Figure 7.

Figure 4

Fuse

Starter Motor

Solenoid

Figure 5

Figure 6

Cover Screws (2 on each side)

Figure 7

Flap Bracket

Mounting Screws

View From Below

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

1.4. Using a 9/16 inch socket and opened end

wrench, remove the front idler pulley to allow the

belt to be removed from around the pulley. See

Figure 8.

NOTE: Maintain correct order of parts.

1.5. Using a 9/16 inch socket and opened end

wrench, remove the rear idler pulley to allow the

belt to be removed from around the pulley. See

Figure 8.

NOTE: Maintain correct order of parts. The pul-

ley mounts to the front hole in the idler arm.

1.6. Drop the belt off the engine pulley.

1.7. Replace the belt and assemble in the reverse

order.

NOTE: Maintain orientation of belt guides during

reassembly. See Figure 8.

Figure 8

Front Idler Pulley Rear Idler Pulley

Idler Pulley Mounting Bracket

2. DECK IDLER PULLEY INSPECTION

2.1. Using a 9/16 inch socket and opened end

wrench, remove the front and rear deck idler pul-

leys and inspect for wear.

NOTE: There is a pyramid washer under the

front mounting bracket that helps maintain the

position of the front idler pulley. See Figure 9.

3. BLADE DRIVE BELT ADJUSTMENT

3.1. Using a ½ inch socket remove the four screws

securing the belt cover and remove the cover.

3.2. With mower on level ground, adjust the blade

cutting height to about 3”.

3.3. With the blade drive control disengaged, set a

gap of 1/8” between the spring and the flat

washer on the end of the threaded portion of the

lift crank by adjusting the nut. See Figure 10.

Figure 9

Rear Idler Pulley

Front Idler Pulley

Nut

Lock Washer

Flat Washers

Flat Washer

Pyramid Washer

Hex Head

Belt Guide

Bracket Position

Cap Screw

Figure 10

1/8” Gap

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

3.4. With the engine OFF have a helper engage the

blade drive. Measure the distance between the

center of the idler pulley and the left drive pulley.

The measurement should be between 5 1/2” and

5 5/8”. See Figure 11.

NOTE: If the blade drive belt slips during opera-

tion it may be necessary to slide the idler pulley

forward in the slot on the idler arm. Loosen the

hardware on the idler pulley and slide the pulley

forward slightly. Tighten the hardware. See Fig-

ure 8.

IMPORTANT: The blades must come to a com-

plete stop when the blade engagement lever is

released.

4. BLADE DRIVE CONTROL LEVER ADJUST-

MENT

NOTE: Make the following adjustment if the

blade drive control lever releases during opera-

tion.

4.1. With the engine off, engage the operator pres-

ence control and the blade drive control. See

Figure 12.

4.2. Without releasing the controls, look inside the

cutout at the left rear of the frame and make sure

that the operators presence control latches are

fully engaged. See Figure 13.

4.3. To adjust, remove the hairpin clip on the upper

end of the operator presence control arm.

4.4. Loosen the hex nut and shorten the rod by one

or two turns. (Do not over adjust.) Tighten the

hex nut securely. See Figure 13.

4.5. If properly adjusted, the blade drive control will

disengage when the operators presence control

is released.

5. BLADE SPINDLE BELT REPLACEMENT

5.1. Using a ½ inch socket remove the four screws

securing the belt cover and removed the cover.

Figure 11

5-1/2” to 5-5/8”

Figure 12

Operator Presence Control

Blade Drive Control

Hairpin Clip

Figure 13

Latched Position

Hex Nut

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

5.2. Using a ½ inch socket loosen the screw securing

the belt tension adjustment bracket and turn it

out of the way. See Figure 14.

5.3. Align the sight holes in the right pulley with the

spindle housing mounting bolts. See Figure 15.

5.4. Using a ½ inch deep socket loosen the four

mounting bolts securing the spindle housing to

the deck. See Figure 15.

5.5. Slide the pulley assembly to the left to loosen

tension on the cogged belt.

5.6. Remove the cogged belt from around the right

cogged pulley.

Figure 14

Belt Tension Adjustment Bracket

Figure 15

Sight Holes (4)

5.7. Temporarily remove the blade drive belt from

around the left blade drive pulley. See Figure 16.

5.8. While holding the Idler arm and brake away from

the left blade drive pulley, remove the toothed

belt from around the left cogged pulley and up

and over the drive pulley. See Figure 17.

5.9. Replace the belt with a new belt.

Figure 16

Blade Drive Belt

Figure 17

Toothed Belt

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

IMPORTANT: Time the blades properly during

reassembly. Set the cutting blades perpendicular

to each other during installation of the toothed

drive belt.There are arrows cast into the cogged

pulleys to help align the blades. Offset these

arrows by 90 degrees. See Figure 18.

NOTE: The arrows do not indicate the blade

position. Blades are 90 degrees offset from the

arrow position.

5.10. Rotate the tension adjustment bracket into posi-

tion and apply tension to the spindle housing

and cogged belt.

5.11. Tighten the adjustment bracket screw.

5.12. Tighten the four spindle mounting bolts to 15 ft.

lbs.

NOTE: Proper belt tension is achieved when the

belt deflects approximately 1/2 inch at the mid-

point between the pulleys when applying moder-

ate finger pressure.

5.13. Reinstall the blade drive belt over the left drive

spindle.

5.14. Install the belt cover.

6. BLADE BRAKE REPLACEMENT

6.1. Using a ½ inch socket remove the four screws

securing the belt cover and removed the cover.

6.2. Secure the operator presence control lever to

the left handlebar using a plastic tie or tape. See

Figure 19.

6.3. Engage the blade control lever to move the

brake pad away from the drive pulley. See Fig-

ure 20.

Figure 18

Blade Alignment Arrow Figure 19

Operator Presence Lever

Plastic Tie

Figure 20

Blade Control Lever Engaged

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

6.4. Using a socket remove the Sems nuts and flat

head screws securing the brake pad to the idler

arm and remove the old brake pad. See Figure

21.

6.5. Loosely install the new brake pad.

6.6. Release the operator presence control and allow

the new brake pad to engage the sheave of the

idler pulley. See Figure 22.

6.7. Tighten the Sems nut to secure the brake pad to

the idler arm.

7. WHEEL DRIVE BELT REMOVAL AND

REPLACEMENT.

NOTE: Some older units may not have all the

belt guides installed.

7.1. Release all mower controls.

Figure 21

Brake Pad

Sems Nuts

Figure 22

Brake pad seats into sheave

7.2. Using a ½ inch socket, remove the two screws

attaching the flap bracket to the frame. Remove

the flap bracket. See Figure 23.

7.3. Using a ½ inch socket remove the four screws

securing the belt cover and remove the cover.

7.4. Temporarily remove the blade drive belt from

around the engine pulley.

7.5. Use a 9/16 inch socket to loosen the locknut

securing the pulley and belt guide to the front

idler bracket. Remove the belt guide and pulley.

See Figure 24.

NOTE: Maintain correct order of parts:

- Pulley

- Washer

- Belt Guide

- Nut

Figure 23

Flap Bracket

Screws

Figure 24

Front Idler Bracket Pulley

Engine Pulley

Trans. Pulley

Backside Idler Pulley

Trans. Pulley Belt Guide Cap Screw

Servicing the Troy-Bilt Wide Cut 33” Combination Mower

7.6. Use a 9/16 inch socket to loosen the cap screw

securing the transmission pulley belt guide to the

frame and engine mount. Pivot the belt guide

away from the pulley. See Figure 24.

7.7. Using a 1/2 inch socket, loosen the nut securing

the rear belt support bracket to the transmission.

Pivot the belt support away from the belt. See

Figure 25.

7.8. Remove the wheel drive belt from the engine

sheave, backside idler and the transmission pul-

ley. See Figure 26.

7.9. Install a new belt in the reverse order.

NOTE: The new belt must be installed inside

out. The “V” side of the belt lies against the

engine sheave only. The flat side of the belt lies

against the transmission pulley and idler pulleys.

8. WHEEL DRIVE BELT ADJUSTMENT

The wheel drive belt requires adjustment when belt

slippage occurs. This is most noticeable when more

traction is needed (such as going up slopes).

8.1. Remove the hair pin clip from the upper end of

the wheel drive control rod. Slide the rod out of

the lever assembly. See Figure 27.

8.2. Using a 9/16” opened end wrench, loosen the

jam nut on the lower end of the rod. See Figure

28.

8.3. Thread the rod one or two turns clockwise for

more tension.

8.4. Insert the rod back into the hole in the wheel

drive control lever and install the hairpin clip.

Figure 25

Rear Belt Support Bracket

Figure 26

Front Idler

Transmission Pulley

Backside

Idler Pulley

Engine Pulley

INSTALL BELT INSIDE OUT!

Figure 27

Hairpin Clip

Wheel Drive Control

Rod

Figure 28

Jam Nut

Wheel Drive Control Rod

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