82
Maintenance Instructions REPLACING/REPAIRING
Fuel Filter
Model D21d has two (2) fuel lters. Replace both
the in-line lter and the Kubota lter element yearly
or every 400 hours of operation.
In-Line
Filter
Cold Start Lever
(For Reference)
Kubota
Fuel Filter
Fuel Filter Location
IMPORTANT: Replace the fuel lters only in a clean
area where the fuel line and connections will not be
contaminated by dust and dirt.
1. Close the Kubota fuel lter cock.
2. Remove and replace the in-line lter; expand
and slide clamps on either side of the lter away
from lter and pull fuel lines o lter.
3. Loosen the ring screw on the Kubota lter as-
sembly, remove the lter pot and lter element.
4. Clean the lter pot and reassemble the lter as-
sembly with a new lter element (use only a
Kubota replacement lter #15231-43560).
5. Open the fuel lter cock.
Blade Overload Shear Bolts
NOTE: Blade shear bolts are not used on belt driv-
en decks.
On gear driven decks, each 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 lb·ft (81 N·m) is also important for proper
shock load protection. It is important to not over-
tighten the mounting nut since this defeats (over-
rides) 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 de-
scribes the blade removal and installation proce-
dure.
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, con-
tact your Walker dealer.
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