55
Maintenance Instructions
CHECKING/SERVICING
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 deck gearboxes.
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 engag-
ing the blade clutch (PTO), operating the engine at
full throttle, then disengaging the clutch and measur-
ing how quickly the blades stop. Watch the rotation
of the blade drive shaft as a visual indi cation that
movement has stopped. If the brake is
working prop-
erly, all rotation will stop five (5) seconds after
disengagement
of the clutch. If the brake system
malfunctions -- blades do not stop in five (5) seconds
-- adjust or repair the brake before operating the mow-
er. Contact your Walker dealer for this service or refer
to the Walker Service Manual.
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 to 1-1/2 second time delay func-
tion on the seat switch to avoid engine power inter-
ruption 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 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 starts
and continues 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
difficult (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
fric-
tion 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 resis-
tance (friction). If the FSC lever movement is
“stiff”,
the friction needs to be decreased.
If the FSC friction lock needs to be adjusted, contact
your Walker dealer or refer to the Walker Service
Manual.