Maintenance Instructions

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 re- placed, 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 guar- anteed, they could be dangerous.

CAUTION

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

Mower Deck Gearbox Replacement

NOTE: Deck gearbox(es) may be changed with the deck mounted on the tractor. However, the deck may be removed from the tractor making the overall job of removing the gearbox assembly easier. Refer to Deck Installation in Assembly Instructions and reverse the procedure to remove the deck.

To replace the mower deck gearbox(es), use the following procedure:

1.Remove mower blades. Refer to procedure in Sharpen Mower Blade instructions.

2.Remove gearbox cover (two machine screws) and PTO shaft guard (two 1/4-20 bolts).

3.Remove two (2) 3/8-16 mounting bolts from each blade drive gearbox and lift the entire gearbox assembly from the deck (including PTO drive shaft).

4.Remove the screws securing the cover plates on the gearboxes and remove the covers. Re- move all covers to be sure oil is completely drained from all gearboxes.

NOTE: With oil flow throughout the unitized gear drive assembly; if one gearbox has internal damage or excessive wear, the remaining gear- boxes and connector tubes should be complete- ly disassembled and thoroughly flushed out with solvent before reassembly.

5.Drain and properly dispose of oil.

6.Remove the four (4) bolts mounting the gearbox to the connector tube and slide the gearbox off the splined drive shaft coupling.

7.Install the new gearbox on the spline coupling of the drive shaft. Establish correct timing of the blade drive gearboxes by setting flats on the output shaft at 90 degrees when connecting the gearbox(es) to the spline coupling. Make sure the timing is correct before proceeding with assembly.

8.Reinstall the four (4) bolts mounting the gearbox to the connector tube but do not tighten them at this time; leave connector tube bolts finger- tight.

9.Position the gear drive assembly on the deck and install the 3/8-16 bolts mounting the entire assembly. Leave the mount bolts finger-tight.

10.Torque all the connector tube bolts to 80 in-lb (9 N⋅m); then tighten the deck mount bolts.

NOTE: This fastener tightening sequence aligns the gearbox assembly with the deck housing and eliminates the possibility of mounting the unitized assembly in a bind.

11.Fill gearbox assembly with oil. Refer to Mower Deck Gearbox Lubrication in this section for instructions.

12.Reassemble remaining items onto deck to com- plete installation. After installing blades, check that the blade timing is correct by moving the blades through one (1) complete revolution. Make sure blade tips pass clear of each other.

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