REPLACING/REPAIRING. Walker DSD56, MB

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REPLACING/REPAIRING. Walker DSD56, MB | Manualzz

Maintenance Instructions

REPLACING/REPAIRING

  DANGER

To prevent accidental starting of the engine when replacing parts or repairing the machine, remove the key from the ignition switch and disconnect the spark plug wires.

IMPORTANT: ALWAYS use genuine factory replacement parts. Substitute parts CAN result in product malfunction and possible injury to the operator and/or others.

REPLACING/REPAIRING

Drive Belts

There are three (3) individual belts on the machine:

· Engine/PTO Belt (Matched Set)

· Ground Drive Belt

The belts may be removed and replaced using the procedures described on the following pages.

Ground

Drive Belt

Engine/PTO Belt

(Matched Set)

Belt Locations

Clutch

(Ref)

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Maintenance Instructions

Engine/PTO Belt

1. To remove the engine/PTO belt: a. Remove wire lock pins (4), open belt guards.

Upper LH

Guard

Lower LH

Guard

Wire Lock Pins

REPLACING/REPAIRING b. Relax belt by depressing idler arm.

c. Roll the belt off the pulley and remove the belt.

Idler Arm

Wire Lock Pin

Right Hand

Guard

Engine/PTO Belt

(Matched Set)

PTO

Pulley

PTO Guard

Engine/PTO Belt (Belt Guards Open) (Engine Hidden for Clarity)

2. To replace the engine/PTO belt: a. Reverse the removal procedure to replace the engine belt.

b. Secure wire on lock pin above tab on lower

PTO guard.

Upper LH

Guard

Right Hand

Guard

Lower LH

Guard

Secure wire above tab PTO Guard

Engine/PTO Belt (Belt Guards Closed) (Engine Hidden for Clarity)

Maintenance Instructions

REPLACING/REPAIRING

Ground Drive Belt

1. To remove the ground drive belt: a. Depress the spring-loaded idler to relax belt.

Ground Drive

Belt

LH Transaxle b. Slide belt off pulleys, then release the idler.

RH Transaxle

Idler Pulley

Depress Idler Pulley to

Relax Belt

Drive Pulley

Tension

Spring

Ground Drive Belt Assembly (Disengaged)

2. Reverse the procedure to install the ground drive belt.

LH Transaxle

Ground Drive

Belt

RH Transaxle

Idler Pulley

Ground Drive Belt Assembly (Engaged)

Drive Pulley

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Maintenance Instructions

Fuel Filter

Models MBV and MBK are equipped with an in-line fuel filter. Visually inspect the filter periodically, and replace the filter yearly.

In-Line

Fuel Filter

Fuel Filter Location - Model MBV

REPLACING/REPAIRING

  DANGER

Gasoline is extremely flammable and can be highly explosive. To minimize danger:

• Use only an approved fuel container for gasoline.

• DO NOT allow open flames or sparks near the machine while performing maintenance or refueling; DO NOT smoke while working with fuel.

• Wipe up spilled gasoline immediately and completely.

1. Expand and slide clamps on either side of the filter away from filter and pull fuel lines off filter.

2. Replace filter.

In-Line

Fuel Filter

Fuel Filter Location - Model MBK

IMPORTANT: Replace the fuel filter only in a clean area where the fuel line and connections will not be contaminated by any dust and dirt.

Maintenance Instructions

Blade Overload Shear Bolts

The cutting blade is keyed to the blade hub by two

(2) shear bolts (10-24 x 5/8 in. stainless steel machine screws). These bolts are designed to shear and protect the blade drive gearbox from damage if the blade encounters a shock load.

Cutting Blade

Shear Bolts

Cutting Blade Shear Bolts

NOTE: Tightening the 5/8-18 blade mounting nut

to 60 ft-lb (81.3 N·m) is also important for proper shock load protection. It is important to not over-

tighten the mounting nut since this defeats (overrides) the function of the shear bolts.

If these bolts shear, remove the blade and install new bolts. Refer to CHECKING/SERVICING in this section for Sharpen Mower Blades which describes the blade removal and installation procedure.

After reinstalling the blade, check blade timing (on gear driven decks) by moving blades through one

(1) complete revolution. Make sure blade tips pass clear of each other. If timing is incorrect, contact your Walker dealer.

REPLACING/REPAIRING

PTO Shear Pin

The PTO drive shaft connection to the deck gearbox has a shear pin to provide shock load protection to the mower deck drive. This system provides pri-

mary shock protection in case of blade impact and will normally shear before the individual shear bolts on the blade hub.

When the PTO pin has sheared, use the following procedure to replace it:

1. Loosen the two bolts securing the PTO shaft guard on the deck; lift the guard off. (Holes in guard are slotted for easy removal.)

2. Rotate U-joint on shaft to align the shear pin hole with the hole (and shear pin fragment) in the shaft. Use a punch to drive the remaining portion of the old shear pin out.

3. Install new shear pin and secure with cotter pin.

U-Joint

Tube Assembly

(Model MBK)

Set Screw

(Model MBV)

Shear Pin

Split Spring Pin

U-Joint

Tube Assembly

(Model MBV)

U-Joint

Shaft Assembly

Cotter Pin

PTO Shear Pin

IMPORTANT: Use only Walker P/N 8067-13 shear pins for replacement to provide proper shock protection -- these pins are hardened to shear under a specific amount of load.

4. Reinstall the PTO shaft guard.

Before operating the deck, inspect the blade overload shear bolts and also check blade timing (on gear driven decks) by moving blades through one

(1) complete revolution. Make sure blade tips pass clear of each other. If timing is incorrect, contact your Walker dealer.

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Maintenance Instructions

Mower Blades

Mower blades are removed and remounted as described in Sharpen Mower Blades instructions.

During the course of sharpening and inspecting mower blades, if there are any of the following conditions of wear or damage, blades should be

replaced for reasons of safety and performance of the machine:

· An excessive amount of the flat section of the blade has been ground away (removed) when the blade is sharpened. Replace the blade when less

than a 3/4 in. (19 mm) flat section remains at the blade tip.

·  Examine ends of the blade carefully, especially the intersection where the flat section of the blade turns up to form the “wing tip” (refer to Mower Blade

Profile for Sharpening illustration in Sharpen

Mower Blades instructions). Since sand and abrasive material can wear metal away in this area, the blade should be replaced when metal thickness has worn to 1/16 in. (1.6 mm) or less.

  DANGER

When blades are operated over sandy soil, and if blades are allowed to wear, a

“slot” may be worn into the wing tip of blade. Eventually a piece of the blade may break off creating a serious potential for injury or damage.

· Check the blades for straightness by marking blade tip position inside the deck housing and then rotating the opposite end of the blade to the same position and comparing. If the difference in blade tip track is more than 1/8 in. (3 mm), the blade is bent and should be replaced.

· Inspect the blade surface, especially in formed areas, for cracks. Replace the blade if any cracks are found.

REPLACING/REPAIRING

  WARNING

DO NOT try to straighten a blade that is bent. NEVER weld a broken or cracked blade. ALWAYS replace with a new blade to assure safety.

Reinstall the blades following procedure from

Sharpen Mower Blades instructions. If blades are replaced, always use Walker original equipment

blades to ensure safety and optimum performance.

The quality and performance of replacement

blades offered by other manufacturers cannot be guaranteed, they could be dangerous.

  CAUTION

ALWAYS use genuine factory replacement parts. Substitute parts CAN result in product malfunction and possible injury to the operator.

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