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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
• 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 or using a blade balancer with straightness
indicator. 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 ar-
eas, for cracks. Replace the blade if any cracks are
found.
Reinstall the blades following procedure from Sharpen
Mower Blades instructions. If blades are replaced, al-
ways use Walker original equipment blades to en-
sure safety and optimum performance. The quality and
performance of replacement blades offered by other
manufacturers cannot be guaranteed, they could be
dangerous.
Mower Deck Gearbox Replacement - All Gear Drive
Decks
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 the Set-Up Section and reverse the pro-
cedure to remove the deck.
To replace the mower deck gearbox(es), use the follow-
ing 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 as-
sembly from the deck (including PTO drive shaft).
4. Remove the screws securing the cover plates on
the gearboxes and remove the covers. Remove 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 gearboxes and
connector tubes should be completely disassem-
bled 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 gear-
box(es) to the spline coupling. Make sure the tim-
ing is correct before proceeding with assembly.
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.
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.
CAUTION
ALWAYS use genuine factory replacement
parts. Substitute parts CAN result in prod-
uct malfunction and possible injury to the
operator.
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