Safety Interlock System; Testing The Safety Interlock System - Scag Power Equipment Liberty Z SZL36-18FR Operator's Manual

Section 4
5. Hourmeter (Figure 4-1). Indicates the number of
hours the engine has been operated. It operates
whenever the ignition key switch is in the ON
position. Has preset maintenance reminders for
engine and hydraulic system oil changes. Will start
flashing scheduled maintenance 2 hours before
preset time and continue flashing until 2 hours after.
Automatically resets.
6. Fuse Holders (Figure 4-1). Two 20-amp fuses
protect the mower's electrical system. To replace
fuses, pull fuse out of the socket and install a new
fuse.
7. Left Steering Control (Figure 4-1). Used to control
the mower's left wheel when traveling forward or
reverse.
8. Right Steering Control (Figure 4-1). Used to
control the mower's right wheel when traveling
forward or reverse.
9. Parking Brake Control (Figure 4-1). Used to
engage and disengage the parking brakes. Pull the
lever back to engage the parking brakes. Push the
lever forward to disengage the parking brakes.
10. Dump Valve Control Levers (Figure 4-2). Located
on the left and right side at the back of the unit,
used to "free-wheel" the mower. Pushing the levers
forward (towards the front of the mower) allows
the unit to move under hydraulic power. Pulling the
levers backward and locking in the notch (towards
the rear of the mower and inward) allows the mower
to be moved by hand (free-wheeling).
DUMP VALVE
CONTROL LEVER
"DRIVE" POSITION
Figure 4-2. Dump Valve Control
2015 SPZ-DVL
11. Deck Lift Foot Lever (Figure 4-1). Used to raise
and lower the cutter deck.
12. Cutting Height Adjustment (Figure 4-1). Used to
set the cutter deck at the desired cutting height.

4.2 SAFETY INTERLOCK SYSTEM

The mower is equipped with a safety interlock system that
prevents the engine from starting unless the deck drive is
disengaged, the steering control levers are in the neutral
position and the operator is in the seat. The interlock system
shuts off the engine if the operator leaves the seat with the
steering control levers not in the neutral position and/or the
cutter blades engaged and the parking brake not engaged.
4.3 TESTING THE SAFETY INTERLOCK
SYSTEM
Test the safety interlock system before you use the machine
each time. If the safety interlcok system does not operate as
descibed below, contact your local Scag Power Equipment
Dealer immediately for repair of the safety interlock system.
1. Sit in the seat in the operating position, engage the
parking brake, place the steering control levers in
the neutral lock position, and engage the PTO switch
to the ON (up) position. Try to start the engine; the
engine should not start
2. Sit in the seat in the operating position, engage the
parking brake, move the PTO switch to the OFF
(down) position, move either of the steering control
handles out of the neutral lock position. Try to start
the engine; the engine should not start. Repeat for
the other steering control lever.
All SZL models will start with the parking brake
engaged or disengaged. For all test procedures
listed below, the engine should be started with the
parking brake engaged unless specified otherwise.
3. Sit in the seat in the operating position, engage the
parking brake, place the steering control levers in
the neutral lock position, move the PTO switch to the
OFF (down) position, and start the engine. With the
engine running, release the parking brake and rise
slightly off of the seat. The engine should shut off.
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