Maintenance Instructions B23
Checking and Servicing
58
Spark Plugs
Every 200 hours of operation, remove the spark
plugs, inspect, clean, and reset the gap (or replace
with new plugs). Before removing the spark
plugs, clean the area around the base of the plugs
to keep dirt and debris out of the engine. Clean
spark plugs with a wire brush. DO NOT use an
abrasive grit type cleaner. If the electrodes are
burned short or pitted, replace plugs with Cham-
pion
®
type RC12YC (or equivalent). Check spark
plug gap with a wire-type feeler gauge and set the
gap at 0.030 in. (0.76 mm). Reinstall and tighten
to between 18 and 22 lb·ft (24 to 30 N·m).
Ignition Wires
Good preventive maintenance calls for complete
replacement of spark plug wires every two (2)
years.
Fuel Lines and Clamps
Every year, inspect the fuel supply 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
WARNING
It is important to check and maintain blade
brake action for safe operation of the ma-
chine.
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 ve (5) seconds after disengagement of
the clutch. If the brake system malfunctions—
blades do not stop in ve (5) seconds, the electric
clutch/brake assembly will need to be repaired or
replaced. Contact your Walker Dealer for this
service.
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 the whole machine.
Engine Starter
Yearly or every 500 hours disassemble and clean
the solenoid shift starter. Refer to the Kohler Ser-
vice Manual for this procedure or contact an autho-
rized Kohler engine dealer to perform this service.
Safety Switch System
WARNING
It is important to check and maintain the
safety switch system for safe operation of
the machine.
There are four (4) safety interlock switches on the
tractor; Seat Switch, FSC Neutral-Park Switch,
PTO Switch, and Parking Brake Switch.
NOTE: There is a 1/2 second time delay function
on the seat switch to avoid engine power interrup-
tion when driving over bumps.
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 or without an operator in the seat, the
engine starts with the Forward Speed Control
(FSC) and/or the PTO engaged, or the parking
brake disengaged.
● With an operator in the seat and the parking
brake engaged, the engine starts but dies
soon after the parking brake is disengaged and
the Forward Speed Control (FSC) or PTO is
engaged.
● Without an operator in the seat, the engine
starts and continues to run with the Forward
Speed Control (FSC) and/or PTO engaged, or
the parking brake disengaged.
● With an operator in the seat, the Forward
Speed Control (FSC) and PTO disengaged,
and the parking brake engaged, but the starter
will not engage.
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