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Maintenance Instructions



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

Security of Air Cleaner System

NOTE: The following inspection is only an exter-

nal inspection and should be done without “dis-

turbing” the filtration components.

On a daily basis, visually inspect the external condition of the complete air cleaner system. The following items should be inspected:

1. Check the Cummins/Fleetguard OptiAir™ air cleaner canister for damage. Make sure the cover is in place and the cover latch is secure - do not run the engine without the air cleaner cover in place and secure.

2. Inspect the air intake hose for cracks, nicks, cuts, etc., and check the hose clamps for tightness.

3. Check to make sure the air flow indicator is in place and tight.


NOTE: For initial battery service during setup, re fer to Battery Service in Assembly Instructions.

IMPORTANT: Make sure battery is securely mounted in the frame. A loose battery may cause damage to the case resulting in acid leakage and severe dam age to the machine. A hazard may be created by damage to critical working parts and safety systems.

Cleaning the Terminals

If battery terminals are corroded, remove battery from the mower. Using a wire brush, remove corrosion with a solution of one part baking soda and

four parts water. Rinse with clean water. Coat the terminals with petroleum jelly or terminal protector spray to retard further corrosion.


Charging the Battery




· Charge the battery in a well-ventilated area, so that gases produced while charging can dissipate.

· Keep sparks, flames, and smoking materials away from the battery at all times.

· Make sure the battery cap vents are open (check manifold vent on each cap).

· Make sure the battery charger is unplugged before connecting or disconnecting cables to the battery.

Check the battery charge by measuring the specific gravity of electrolyte; if specific gravity is less than

1.225, the battery will need to be charged as follows:

·  Charge the battery at 15 amps for 10 minutes. DO

NOT exceed 20 amps maximum recom mended charging rate. Charge until specific gravity is at least

1.250. Total charging time should not exceed one (1) hour.

Tire Pressure

Inflate tires to pressures shown below:

Deck Caster Wheel = 20 PSI (137 kPa)

Drive = 15 PSI (103 kPa)

Rear = 20 PSI (137 kPa)

Wheel Nut Torque

Check every 100 hours the eight (8) Drive Tire mounting nuts. They should each be torqued to

75 to 85 ft-lbs. (101.7 to 115.2 N·m).

Sharpen Mower Blades

Check mower blade(s) for straightness, sharp-

ness, condition of the cutting edge, and balance

every 10 hours of operation (or more often when mowing abrasive type grass or operating on sandy soils). Replace blades if worn, bent, cracked, or

otherwise damaged (refer to REPLACING/RE-

PAIRING the Mower Blades in this section). Use the following procedure to check and sharpen blades:



Maintenance Instructions

NOTE: Keep blades sharp - cutting with dull blades not only yields a poor mowing job but slows the cutting speed of the mower and causes extra wear on the engine and blade drive by pulling hard.

1. Stop the engine, remove ignition key, and disconnect the spark plug wires before raising the mower deck to service blades.

2. Raise the deck and secure it in the TILT-UP po sition (refer to Deck Secured in TILT-UP Po-

sition photo in CLEANING of Grass Buildup

in Mower Housing in this section).


NEVER operate cutter blades with the deck in the raised position.

NOTE: PTO shaft must be disconnected before checking blades for straightness.

3. Check the blades for straightness by marking the 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 re- placed.


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.

4. If the blade cutting edge is dull or nicked, it should be sharpened. Remove blades for sharpening by grasping the end of the blade using a rag or a thick, padded glove, while loosening and removing the nut, lock washer, and flat washer that mounts the blade.

5. Grind cutting edge at the same bevel as the original. Sharpen only the top of the cutting edge to maintain sharpness.

NOTE: Blades can be sharpened with an electric blade sharpener, conventional electric grinder, or a hand file.


Do Not Grind or

Sharpen on Underside

Mower Blade Profile For Sharpening



Blade Balancer



ALWAYS wear eye protection and gloves when sharpening a blade.

6. Check blade balance by positioning the blade

horizontally on a blade balancer or use a nail or shaft through the center hole. If either end of the blade rotates downward, grind (remove) metal on that end until the blade will balance.

The blade is properly balanced when neither end drops. Balance of a blade is generally maintained by removing an equal amount of material from each end of the blade when sharpening.

Sharpen at

Original 30° Angle


Wear Area

Blade Balanced on Magnetic

Wall-Mounted Balancer

7. Mount the blade with wing tips pointing up into the housing. Reinstall the blade, washer, lock washer, and nut. Tighten the nut to 60 ft-lb

(81.3 N·m).

Maintenance Instructions

Drive Belts

Raise the body and inspect the condition of the three (3) drive belts after every 25 hours of operation -- engine/PTO drive and ground drive. If the belts show signs of cracking or deteriorating, the belts should be replaced. Refer to REPLACING/

REPAIRING the Drive Belts in this section.

Mower Deck Gearbox Oil Seals

The mower deck gearbox seals should be inspected

every 25 hours for evidence of oil leaking; particu-

larly the lower oil seal on the blade drive gearbox.

This seal is protected by the trash guard on the blade hub and seal protector plate on the housing, but is still vulnerable to seal damage due to operating in an adverse environment. The mower blade must be removed for inspection of the seal, so it is recommended to inspect the gearbox seals when blades

are removed for sharpening. If an oil leak is noted, the seal should be replaced and the gearbox assembly relubricated. Refer to LUBRICATION for

Mower Deck Gearbox Lubrication in this section.

Spark Plugs

Every 100 hours, remove the spark plugs, inspect, clean, and reset the gap (or replace with a new

plug). Clean spark plug with a wire brush. If the electrodes are burned short or pitted, replace the plug (refer to Specifications for the proper type of replacement plug). Check the spark plug gap with a wire-type feeler gauge and set the gap between

0.028 and 0.032 in. (0.7 and 0.8 mm). Reinstall and tighten to 17 ft-lb (23.0 N·m). Both spark plugs should be replaced yearly.

Breaker Points - Model MBV

The Briggs & Stratton engine is equipped with electronic ignition. No breaker points, maintenance, or adjustments are necessary with this system. Contact an authorized Briggs & Stratton engine dealer in case of ignition failure.

Fuel Lines and Clamps

Every year, inspect the fuel line from the tank to engine for deterioration or damage. Also, inspect the fuel line clamps for tightness. Good preventive maintenance calls for complete replacement of fuel lines and clamps every two (2) years.


Blade Brake Action


It is important to check and maintain blade brake action for safe operation of the machine.

Check the function of the cutter blade brake by engaging the blade clutch (PTO), operating the engine at full throttle, then disengaging the clutch and measuring how quickly the blades stop. Watch the rotation of the blade drive shaft as a visual indication that movement has stopped. If the brake is working properly, all rotation will stop five (5) seconds

after disengagement of the clutch. If the brake system malfunctions - blades do not stop in five (5) seconds - adjust or repair the brake before operating the mower. Contact your Walker dealer for this service or refer to the Walker Service Manual.

PTO U-Joints

The PTO U-joints should be inspected yearly for looseness and wear. If either is noticed, the respective shaft or tube should be replaced. A worn U-joint can cause vibration and extensive damage to the

PTO and deck gearboxes.

Engine Starter - Model MBK

Yearly or every 500 hours disassemble and clean the solenoid shift starter. Refer to the Kohler Service

Manual for this procedure or contact an authorized

Kohler engine dealer to perform this service.



Maintenance Instructions

Safety Switch System


It is important to check and maintain the safety switch system for safe operation of the machine.

There are three (3) safety interlock switches on the tractor; Seat Switch, FSC Neutral - Park Switch, and

PTO Switch.

If any of the following conditions occur during starting or operating, a safety interlock switch may be malfunctioning. Contact your Walker dealer for troubleshooting and/or replacement.

· With an operator in the seat, the engine starts with the Forward Speed Control (FSC) and/or the PTO engaged.

· With an operator in the seat, the engine starts but dies soon after the Forward Speed Control (FSC) or

PTO is engaged.

· Without an operator on the seat, the engine starts and continues to run with the Forward Speed Control

(FSC) and/or PTO engaged.

· With an operator in the seat, the Forward Speed

Control (FSC) and PTO disengaged and panel horn works, but the starter is not engaging.


Forward Speed Control Friction Lock

The FSC friction lock is designed to hold the se-

lected forward travel speed when the steering levers are moved and yet the friction is not too heavy to make moving the FSC control difficult (too much friction). The procedure for checking the FSC friction lock is as follows:

1. Place the FSC in the full FORWARD position and pull both steering levers back; the FSC lever should not move. If the FSC lever moves back when the steering levers are pulled back, the friction needs to be increased.

2. With the steering levers held back, move the

FSC lever back from the FORWARD position.

With a proper amount of friction adjusted, the

FSC lever should move back with a slight amount of resistance (friction). If the FSC lever movement is “stiff”, the friction needs to be decreased.

If the FSC friction lock needs to be adjusted, refer to

Forward Speed Control Friction Adjustment in AD-

JUSTMENTS in this section or contact your Walker dealer.


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