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Maintenance Instructions REPLACING/REPAIRING
Fuel Filter
DANGER
Gasoline is extremely ammable and can
be highly explosive. To minimize danger:
● Before servicing the fuel system:
1) Disconnect the spark plug leads.
2) Disconnect the negative (-) battery
cable from battery.
● Use only an approved fuel container
for gasoline.
● DO NOT allow open ames or sparks
near the machine while performing
maintenance or refueling; DO NOT
smoke while working with fuel.
● Wipe up spilled gasoline immediately
and completely.
Model S18 is equipped with an in-line fuel lter be-
tween the fuel tank and the fuel pump. Visually in-
spect the lter periodically, and replace the lter ev-
ery 400 hours of operation or when contamination
is suspected or found in the fuel.
In-Line
Fuel Filter
Fuel Filter Location
IMPORTANT: Replace the fuel lter only in a clean
area where the fuel line and connections will not be
contaminated by dust and dirt.
1. Expand and slide clamps on either side of the
lter away from lter and pull fuel lines o lter.
2. Replace lter, making sure that the arrow on the
lter is aligned with the fuel ow through the
lter.
3. Verify that the fuel lines and clamps are securely
attached, and that no fuel leaks are present.
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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