D21d
Operating Instructions
43
CAUTION
If the cutting blades strike a stationary ob-
ject while mowing, stop the mower immedi-
ately, disconnect the electrical plug on the
fuel shut-off solenoid, lift the deck, and in
-
spect the deck and blades thoroughly for
damage. Make sure that the blade timing
has not been disturbed (the blades should
be at 90 degrees to each other). Refer to
Blade Overload Shear Bolts on page 86
if blades are out of time. Also, make sure
the blade retaining nuts are torqued to 60
lb·ft (81 N·m).
STOPPING THE MACHINE
1. Pull the steering levers to the
NEUTRAL
posi
-
tion and then move the FSC lever backward to
the
NEUTRAL-PARK
position.
2. Slow the engine to a fast idle; put the throttle
in the 1/2 throttle position.
3.
Disengage the blade clutch.
IMPORTANT:
DO NOT
disengage the blade
clutch with high engine speed (above 1/2
throt tle) since the brake action on the blade
drive will cause premature wear of the brake
band.
WARNING
A brake stops the cutter blades (and
blower on GHS equipped models) from
freewheeling within five (5) seconds after
disengaging the clutch. If the brake sys tem
malfunctions and the blades do not stop
within five (5) seconds, the brake should be
adjusted or repaired before further opera-
tion of the mower. Contact your Walker
dealer, or refer to
Clutch Disengagement/
Brake Action on page 91
.
4. Slow the engine to Idle, put throttle in
IDLE
position; turn the ignition switch
OFF.
WARNING
Remove the key from the ignition switch
when leaving the mower unattended. This
will prevent children and inexperienced op-
erators from starting the engine.
5. Engage the parking brake.
IMPORTANT:
The hydrostatic transmissions
lock to prevent the mower from rolling freely
with the engine stopped. However, if the
mower is parked on a slope, it is necessary to
ENGAGE
the parking
BRAKE
to prevent the
mower from creeping. This is due to a small
amount of slip page in the hydrostatic trans-
missions, especially when transmission fluid is
warm. Also, engaging the parking brake is
recommended when stopping or parking the
machine in a confined space with little toler-
ance for movement.
CAUTION
An operator presence switch (seat switch)
will cause the engine to stop if the parking
brake is in the DISENGAGED position and
the operator is not in the seat. The function
of this switch should be checked by the op-
erator raising off the seat with the parking
brake lever in the DISENGAGED position
(tractor not moving and blade clutch disen-
gaged); the engine should stop. NOTE: Al-
low 1/2 second “off the seat” for the time
delay function. If the safety sys tem is not
working, it should be repaired or replaced
before operating the mower. DO NOT dis-
connect the safety switches; they are for
the operator’s protection.
WARNING
In case either of the transmission drive
belts break during operation, and if the ma-
chine is on a slope, the machine will free-
wheel down the slope. To maintain control,
immediately (1) Release the steering levers
and simultaneously (2) Move the FSC to the
NEUTRAL-PARK position. When the ma-
chine is stopped or moving slowly, engage
the parking brake.