Troy-Bilt 753B, F753B manual Wheel Drive Belt Replacement, Wheel Drive Belt Adjustment

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Section 5: Maintenance

WARNING

Before inspecting, cleaning or servicing the machine, shut off engine, wait for moving parts to stop, disconnect spark plug wire and move wire away from spark plug. Remove ignition key (electric start models).

Failure to follow these instructions can result in serious personal injury or property damage.

WHEEL DRIVE BELT

REPLACEMENT

Follow this procedure to replace the wheel drive belt.

1.

Stop engine, wait for all parts to

stop moving, and disconnect spark

plug wire.

2.

Release all mower controls.

3.

Remove belt cover as described in

“Belt Cover Removal” instructions.

4.

Locate wheel drive belt (O, Figure 5-

11) and remove it from top sheave of

engine sheave, backsided idlers (P and

Q) and transmission sheave (R).

5.

Install new belt as shown in Figure 5-

11. Belt must be installed “inside out ”–

“V” side of belt lies against

engine sheave only. Flat side of belt lies

against transmission sheave (R) and

back-sided idlers (P and Q).

6.

Make sure belt is inside belt guide (S,

Q

O

S

P

R

Figure 5-11: Wheel drive belt replacement.

Figure 5-11).

7.

Reinstall belt cover securely.

8.

An adjustment to the drive belt may

be necessary. See “Wheel Drive Belt

Adjustment” in this Section.

WHEEL DRIVE BELT

ADJUSTMENT

The wheel drive belt requires an adjust- ment if loss of drive belt tension (slip- page) occurs. This is most noticeable when more traction is required (such as going up slopes).

To Test Wheel Traction:

1.Park machine on a paved (concrete, etc.) surface with front edge up against a sturdy wall, fence, etc.

2.Put Gear Select Lever in No. 1 setting.

IMPORTANT: DO NOT PARK AGAINST A PAINTED OR SIDED WALL. TESTING THE WHEEL DRIVE SYSTEM REQUIRES MACHINE TO BE FORCIBLY PUSHED AGAINST WALL. DAMAGE TO PAINT OR SIDING COULD RESULT.

3.With engine running, and machine placed firmly up against wall, hold down Operator Presence Control and fully en-

gage wheel drive by squeezing Wheel Drive Control until it contacts handlebar.

4.Wheels should slip on paved surface. If they do not, an adjustment is required.

To Adjust Wheel Drive Belt:

1.Stop engine, wait for all parts to stop moving, and disconnect spark plug wire.

2.Remove cotter pin (A, Figure 5-12A) from upper end of Wheel Drive Control rod. Slide rod out of lever assembly.

3.Loosen jam nut (D, Figure 5-12).

4.Thread rod (E, Figure 5-12) one or

two turns clockwise for more tension or counterclockwise for less tension.

5.Insert rod back into hole in Wheel Drive Control lever and install cotter pin. Bend ends of cotter pin to secure.

6.Retest wheel traction. Repeat adjust- ment procedure, if necessary. Most comfortable operation will be obtained when the adjustment allows the lever to just make contact with the handgrip as sufficient wheel traction is achieved. When adjustment is complete, tighten jam nut (D) firmly against block (B).

A

Figure 5-12A

WHEEL BRAKE ADJUSTMENT

This adjustment may be required if the machine does not hold on a hill with the Operator Presence Control disengaged, or if the brake drags with the Operator Presence Control engaged and the trans- mission in neutral.

1.Stop engine, wait for all parts to stop moving, and disconnect spark plug wire.

2.Disengage (release) the Operator Presence Control (M, Figure 5-13).

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Contents Operator’s Manual Importantread Safety Rules and Instructions CarefullyCalling Customer Support Table of ContentsFinding Model Number Engine InformationSafe Operation Practices for Walk-Behind Mowers Safety Alert SymbolGeneral Operation Tive harmIII. Children SafetyIV. Service II. Slope OperationPinch Points Safety DecalsTOOLS/MATERIALS Needed Assembly StepsIntroduction Inspection After DeliveryAttach Control Rods Assembly4A Attach wheel drive control rod to lever Check Tire Pressure Secure Wire HarnessAfter Assembling Before Using Unit Check Motor Oil LevelBlade Drive Control Mower Features and ControlsOperator Presence Control Cutting Height Control Lever Features and ControlsGear Select Lever Wheel Drive ControlEngine Recoil Starter Ignition/Starter Switch Electric Start ModelEngine Throttle Control Set Mower Cutting Height Pre-Operation ChecklistRelease all controls before adjusting the cutting height Before Operating MowerTo Start the Engine Moving the Mower Without Engine PowerOperation Starting and Stopping EngineTo Stop the Blades To Stop the EngineEngaging the Blades To Engage the BladesMowing Tips and Hints Making TurnsBlade Brake Control Test Changing Oil Engine ServiceEngine OIL Checking Oil LevelSpark Plug MaintenanceEngine Cleaning AIR Cleaner ServiceEngine Storage Mower ServiceTipping Mower for Service Blade Spindle Belt ReplacementBlade Drive Disengaged Blade Drive Engaged Blade Drive Belt ReplacementTighten hex nut securely after adjust- ing control rod Blade Brake ReplacementAdjustment Blade Drive Control Lever AdjustmentWheel Brake Adjustment Wheel Drive Belt ReplacementWheel Drive Belt Adjustment Remove cotter pin securing shift link P, -15 to shift rod Follow this procedure to adjust neutral on the transmissionMower Blades Cleaning Underside Mower Deck Battery MaintenanceDusty conditions LubricationOFF-SEASON Storage Extremely dirty orMaintenance Chart Overheats.Engine Improperly adjusted drive linkageFaulty ignition Faulty spark plug Empty fuel tank Is available from your authorized mower orPage MANUFACTURER’S Limited Warranty for

753B, F753B specifications

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