57
Maintenance Instructions CHECKING/SERVICING
Fuel Lines and Clamps
NOTE: The fuel system after the fuel pump module
is pressurized and should only be serviced by a Walk-
er dealer or authorized Kohler service dealer.
Every year, inspect the fuel lines from the tanks 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.
PTO U-Joints
The PTO U-joints should be inspected yearly for
looseness and wear. If either is noticed, the respec-
tive shaft or tube should be replaced. A worn U-joint
can cause vibration and extensive damage to the
PTO and the whole machine.
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 en-
gaging the blade clutch (PTO), operating the engine
at full throttle, then disengaging the clutch and mea-
suring how quickly the blades stop. Watch the rota-
tion of the blade drive shaft as a visual indi cation that
movement has stopped. If the brake is working
properly, all rotation will stop ve (5) seconds af-
ter disengagement of the clutch. If the brake system
malfunctions -- blades do not stop in ve (5) seconds
-- adjust or repair the brake before operating the
mower. Refer to ADJUSTMENTS for Clutch Disen-
gagement/Brake Action, Step 2 - Blade Brake Band
Adjustment, on page 70.
Safety Switch System
WARNING
It is important to check and maintain the
safety switch system for safe operation of
the machine.
There are three (3) safety interlock switches on the
tractor; Seat Switch, FSC Neutral - Park Switch, and
PTO Switch.
NOTE: There is a 1/2 second time delay function on
the seat switch to avoid engine power interruption
when driving over bumps.
If any of the following conditions occur during starting
or operating, a safety interlock switch may be mal-
functioning. Contact your Walker dealer for trouble-
shooting 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.
• With an operator in the seat, the engine starts but
dies soon after the Forward Speed Control (FSC) or
PTO is engaged.
• Without an operator on the seat, the engine con-
tinues to run with the Forward Speed Control (FSC)
and/or PTO engaged.
• With an operator in the seat, the Forward Speed
Control (FSC) and PTO disengaged and horn works,
but the starter is not engaging.
Forward Speed Control Friction Lock
The FSC friction lock is designed to hold the select-
ed forward travel speed when the steering levers
are moved and yet the friction is not too heavy to
make moving the FSC control difcult (too much
friction). The procedure for checking the FSC friction
lock is as follows:
1. Place the FSC in the full FORWARD position
and pull both steering levers back; the FSC lever
should not move. If the FSC lever moves back
when the steering levers are pulled back, the
friction needs to be increased.
2. With the steering levers held back, move the
FSC lever back from the FORWARD position.
With a proper amount of friction adjusted, the
FSC lever should move back with a slight amount
of resistance (friction). If the FSC lever move-
ment is “stiff”, the friction needs to be de-
creased.
If the FSC friction lock needs to be adjusted, refer to
ADJUSTMENTS for Step 7 - Forward Speed Control
Friction Adjustment in this section.
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