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Checking the Interlock
Switches
CAUTION
If safety interlock switches are disconnected or
damaged the machine could operate unexpectedly
causing personal injury.
• Do not tamper with the interlock switches.
• Check the operation of the interlock switches
daily and replace any damaged switches before
operating the machine.
The machine has interlock switches in the electrical system.
These switches are designed to stop the engine when operator
gets off of the seat when the traction pedal is depressed.
However, the operator may get off of the seat while the
engine is running, the traction pedal is in neutral and the
parking brake engaged.
To check the operation of the interlock switches, perform
the following procedure:
1. Drive the machine slowly to a large, relatively open
area. Lower the cutting unit, stop the engine, and apply
the parking brake.
2. Sit on the seat and depress the traction pedal. Try to
start the engine. The engine should not crank. If the
engine cranks, there is a malfunction in the interlock
system that should be corrected before beginning
operation.
3. Sit on the seat and start the engine. Rise from the seat
and move the PTO lever to On. The PTO should not
engage. If the PTO engages, there is a malfunction in
the interlock system that should be corrected before
beginning operation.
4. Sit on the seat, engage the parking brake and start the
engine. Move the traction pedal out of the neutral
position. The traction drive should not function. If the
traction drive still functions there is a malfunction in
the interlock system that should be corrected before
beginning operation.
Pushing or Towing the
Machine
In an emergency, the machine can be moved forward by
actuating the bypass valve in the variable displacement
hydraulic pump and pushing or towing the machine.
Important: Do not push or tow the machine faster than
3-4.8 km/h (2-3 MPH) because internal transmission
damage may occur. The bypass valves must be open
whenever the machine is pushed or towed.
1. Raise the hood and locate the bypass valves on the
pump
(Figure
36).
1. Bypass valves (2)
2. Rotate each valve 3 turns counter-clockwise to open
and allow oil to bypass internally. Do not open more
than 3 turns. Because fluid is bypassed, the machine can
be slowly moved without damaging the transmission.
3. Close the bypass valves before starting the engine.
Torque to 70 N-m (52 ft-lb) to close the valve.
Important: If the machine must to be pushed or
towed in reverse, the check valve in the four-wheel
drive manifold must also be bypassed. To bypass
the check valve, connect a hose assembly (Hose
Part No. 95-8843, Coupler Fitting No. 95-0985
[Qty. 2], and Hydraulic Fitting No. 340-77 [Qty.
2]) to the reverse traction pressure test port MB,
located on the hydrostat, and on the test port G2
on the rear traction manifold which is located
behind the front tire.
1. Reverse four-wheel drive
pressure test port (Port
G2)
2. Hose assembly
34
Figure 36
1
2
G021
160
Figure 37
3. Reverse traction pressure
test port (Port MB)
3
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