MTD LT-5 Manuale utente

Service Manual

LT-5 Lawn Tractor

MTD Products Inc - Product Training and Education Department

FORM NUMBER - 769-01415

2/2005

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.

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TABLE OF CONTENTS

General Information ....................................................................................................................1

Operator Controlled Reverse (OCR) ..........................................................................................1

Numbering System .....................................................................................................................2

Deck Removal ............................................................................................................................2

Blade Drive Belt Removal ..........................................................................................................3

Deck Idler Bracket Removal .......................................................................................................3

Spindle Removal ........................................................................................................................4

Fender Removal .........................................................................................................................5

Upper Drive Belt Removal ..........................................................................................................6

Lower Drive Belt Removal. .........................................................................................................8

Variable Speed Pulley Removal .................................................................................................8

Variable Speed Idler Bracket Removal ......................................................................................9

Transmission Removal – 618-04072 ........................................................................................10

Deck Lift Assembly ..................................................................................................................11

Removal of the Steering Shaft and Sector Gear ......................................................................12

Pedal Support Bracket Removal ..............................................................................................13

Speed Control Latch Removal .................................................................................................13

7-Speed Shift Lever Removal ..................................................................................................14

Parking Brake and Shift Control Adjustments ..........................................................................15

Toe-In Adjustment ....................................................................................................................15

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LT-5 LAWN TRACTOR (TROY-BILT MODEL

SHOWN)

GENERAL INFORMATION

Model used in the Service Manual - 13AN779G766

17.5 hp Briggs & Stratton engine - 42” cutting deck

• RMC - “Reverse Mowing Control” technology

• Greaseable Spindles.

• Square Shoulder Tires.

• Wider tires 15X6 and 20X8 .

• 18” Turning Radius

• Improved Independent Controls.

• Operational Controls on Fender and Dash.

• Cup Holder.

• Fully Welded Frame.

• 38” and 42” decks with Fast Attach.

• All decks are “Wash Kit” ready

• Enhanced Hour Meter Package

RMC - “REVERSE MOWING CONTROL”

The operator can choose to over-ride our “No Cut In

Reverse” safety system.

The revised ANSI Standard B71.1 taking effect Sep-

tember 1, 2004 states:

“A means shall be provided that prevents reverse drive

operation at a ground speed greater than 1 ft./sec.with

powered blade(s).

An override capability may be provided to permit

reverse drive with powered blades temporarily. If an

override capability is provided, it shall automatically

reset when one or more of the following actions occurs:

The blade(s) is (are) re-engaged or (2) the engine is

restarted or (3) the directional control is moved from

reverse.”

How It Works:

• Operator turns the key from the run position #3

to position #2. See Figure 1.

• Presses RMC button.

• Light indicator gives visual confirmation to the

operator.

Operator may mow in forward or reverse until:

• Leaves the tractor seat.

• Turns the key back to right (position #3).

• Turns the engine off (position #1).

Incorporated on 2005 LT-5 and RT99.

Figure 1

#1 #2 #3

Servicing the LT-5 Lawn Tractor

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NUMBERING SYSTEM

The LT-5 will follow the same model number configura-

tion as the BFR which was the 600 series (frame size)

but now in the fifth position there will be a ( 7 ) to signify

transition to the new platform.

Example: 13AD789G790

1. DECK REMOVAL

1.1. Place the unit on a firm and level surface.

1.2. Remove the key from the ignition.

1.3. Lower the deck to its lowest cutting position.

1.4. Using needle nose pliers, remove the hairpin

clips securing the deck hanger brackets to the

deck. Release the hanger links from the deck.

See Figure 2.

1.5. Using a 1/2” socket, remove the hex head cap

screw securing the belt keeper to the frame.

Remove the belt keeper. See Figure 3.

NOTE: Note the location of the belt keeper dur-

ing removal. There are two holes in the side

frame. Use the forward hole during assembly.

1.6. Slide the deck forward and remove the deck belt

from around the engine pulley. See Figure 4.

1.7. Lift the front stabilizer from the front stabilizer

bracket.

1.8. Remove front stabilizer adjustment rod by sliding

rod forward untill the flat area is in line with stabi-

lizer bracket notch. Turn the rod 90 degrees and

remove it from the tractor.

1.9. Raise the deck lift lever to its highest cutting

position.

Figure 2

Deck Hanger Bracket

Hairpin Clip

Figure 3

Belt Keeper

Hex Cap Screw

Figure 4

Front Stabilizer Engine Pulley

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1.10. Using needle nose pliers, remove the hairpin clip

securing the deck engagement cable to the deck

flange. See Figure 5.

1.11. Slip the oval plastic retainer ring from the con-

nector. Pull the connector rearward, lining the

grooves in the connector with the deck flange

and slide it up and out of the flange. See Figure

1.12. Remove the tension spring from the deck idler

bracket.

NOTE: Depending on which deck is installed on

the unit, it may be necessary to remove the spin-

dle brake connecting rod between the two spin-

dles in order to remove the deck engagement

spring.

1.13. Slide the deck out from under the unit.

Figure 5

Deck Engagement Cable

Deck Bracket

Figure 6

Deck Bracket

Oval Retainer

2. BLADE DRIVE BELT REMOVAL

NOTE: The 38” deck has a single pulley on the

idler. The 42” deck has two pulleys on the idler.

Disassembly procedures are similar.

2.1. Remove the cutting deck from the unit.

2.2. Using a ½” socket, remove the three screws

securing the belt cover to the deck. Repeat for

the other belt cover. See Figure 7.

NOTE: The belt covers are interchangeable.

2.3. Using a 9/16” socket and an open-end wrench,

loosen but do not remove the nuts securing both

idler pulleys to the idler bracket. See Figure 8.

2.4. Remove the belt from around the idler pulleys

and spindles.

Figure 7

Belt Covers

Figure 8

Idler Pulleys

Idler Bracket

Belt Guides

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3. DECK IDLER BRACKET REMOVAL

NOTE: The 38” deck has a single pulley on the

idler. The 42” deck has two pulleys on the idler.

Disassembly procedures are similar.

3.1. Remove the deck from the unit.

3.2. Remove the deck drive belt.

3.3. Remove the deck idler bracket spring. See Fig-

ure 9.

3.4. Remove the cotter pin holding the brake rod to

the idler bracket and remove the brake rod con-

nected to the idler bracket. See Figure 10.

3.5. Using a 9/16” socket and a 9/16” wrench,

remove the bolt and nut securing the idler

bracket to the frame. There is a shoulder spacer

under the idler bracket. Remove the idler

bracket. Inspect the idler bracket for wear or

damage. Inspect the brake puck at the end of

the idler bracket for wear or damage. The brake

puck is riveted to the idler bracket. See Figure

11.

NOTE: The 38” and 42” deck share the same

idler bracket. They each use unique mounting

holes. Correct holes are marked on the bracket.

This is also true for the tension springs. The hole

in the center of the bracket has a step washer in

it. See Figure 12.

3.6. Using two 9/16” wrenches remove the idler pul-

leys.

Figure 9

Deck Idler Bracket Spring

Figure 10

Brake Rod

Cotter Pin

Figure 11

Shoulder Spacer

Lower Spacer

Figure 12

Shoulder Spacer

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3.7. Inspect the pulleys and pulley bearings for dam-

age and wear. Replace as needed.

NOTE: When reassembling be sure to install the

spacer under the pulley and the thinner flat

washer on top.

NOTE: Lubricate the idler bracket with a small

amount of lithium grease during assembly. Per-

form this lubrication on a yearly basis.

4. RIGHT SPINDLE BRAKE

4.1. Remove the brake spring attached from the deck

frame to the brake assembly at the right spindle.

See Figure 13.

NOTE: Although similar, this spring is different

from the spring on the Idler arm. This spring may

be painted yellow.

Figure 13

Brake Assembly

Brake Spring

4.2. Using a ½ inch socket and a ½” wrench remove

the brake assembly bracket. Inspect the brake

puck for wear or damage. The brake puck is riv-

eted to the bracket and must be replaced as an

assembly. See Figure 14.

5. SPINDLE REMOVAL

5.1. Remove the deck from the unit. See DECK

REMOVAL Section.

5.2. Remove the blade drive belt. See BLADE

DRIVE BELT REMOVAL Section.

5.3. Remove the deck Idler bracket and spindle

brake bracket. See DECK IDLER BRACKET

REMOVAL Section.

Figure 14

Riveted Brake Puck

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5.4. Using an impact wrench and a 15/16” socket

remove the pulley and blade from the spindle

assembly. See Figure 15.

NOTE: Use a blade stop to secure the blade and

prevent it from rotating during disassembly.

5.5. Using a ½” socket remove the spindle housing

for inspection or replacement. See Figure 16.

5.6. Assemble the spindle in reverse order of disas-

sembly. See Figure 17.

NOTE: During assembly, align the two bearing

spacers inside the spindle as you insert the spin-

dle shaft.

6. FENDER REMOVAL

6.1. Tip the seat forward.

6.2. Remove the battery and battery tray. See Figure

18.

Figure 15

Pulley

Spindle

Blade Stop

Figure 16

Figure 17

Figure 18

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6.3. Using a spring puller, carefully remove the seat

spring. See Figure 19.

CAUTION: The tension spring is wound very

tight.

6.4. Disconnect seat safety switch wires. See Figure

20.

NOTE: Remember to reconnect wires before

returning to service.

Figure 19

Spring Puller

Figure 20

Seat Safety Switch

6.5. Using a ½” socket remove the four bolts secur-

ing the seat bracket to the frame. See Figure 21.

6.6. Lift the seat off of the frame and set it aside.

6.7. Working from under the running boards and

using a ½” socket, remove the two nuts securing

the running boards to the frame. See Figure 22.

NOTE: The running board footpads cover the

bolts securing the fenders to the frame. It is not

necessary to remove the footpads. Hold down

on the top of the bolt during disassembly.

Figure 21

Seat Bolts

Figure 22

Running Board Nut

(One on each side)

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