Gravely Pro-Walk Hydro 36HR PS Owner's/Operator's Manual page 17

Test Operator Presence Safety
Interlock System
(988156, 157, 158, 159)
1. Start engine.
2. Move left control lever in to engage the
operator presence control switch.
3. Unlock parking brake.
4. Move throttle to mid-open position.
5. Move PTO/clutch switch to ON position.
Result: Mower deck should engage.
CAUTION: Avoid injury! Keep
bystanders away. The mower will
engage as soon as the left control
lever is moved in.
1. Release left control lever to disengage
the operator presence safety switch.
Result: The mower deck MUST stop.
Test PTO/Clutch Safety Switch
(988156, 157, 158, 159)
1. Move the control levers to the neutral
position and release the left control
lever.
2. Move PTO/clutch switch to ON position.
3. Turn ignition switch to ON position. Turn
ignition switch to START position and
release (988157, 158, 159) or pull recoil
start handle (988156).
Result: The engine must not start.
Test Parking Brake Switch
(988156, 157, 158, 159)
1. Engage parking brake.
2. Move the control levers to the neutral
position and release the left control
lever.
3. Move parking brake lever to OFF
position.
Turn ignition switch to ON position. Turn
ignition switch to START position and release
(988157, 158, 159) or pull recoil start handle
(988156).
Result: The engine must not start.
4. Re-engage the parking brake.
5. Start unit.
6. Engage the operator presence lever.
7. Push forward on right-side control lever.
Result: The engine should begin to stall until
control lever is released.
Test Safety Interlock System
(988153, 154, 155, 169)
DANGER: SAFETY INTERLOCK
SYSTEM FAILURE and improper
operation of unit can result in death
or serious injury. ALWAYS know the
safety interlock system is operating
properly.
WARNING: AVOID INJURY. When
the engine is running and the speed
control levers are engaged,
releasing only one steering latch
causes the unit to circle around one
drive wheel.
ALWAYS hold both steering levers
in the neutral position when
releasing the steering lever latches.
ALWAYS release levers slowly.
The speed control levers are interlocked and
are used to set the unit's fastest forward
speed.
The steering control levers allow independent
control of each hydraulic drive pump to steer,
operate in forward and reverse, and stop the
unit.
The steering lever latches hold the steering
control levers in neutral.
Test the safety interlock system at each
operation. If the system does not function
properly, do not operate the unit until repairs
are made.
The engine will only start with the PTO
disengaged, the speed control levers in
neutral and the parking brake on.
To test:
1. With engine off, set controls as listed in
line A of the following table.
2. Turn electric start model (988154, 155,
169) ignition switch to Start.
Engine must not crank.
3. Turn recoil start model (988153) ignition
switch to On. Pull recoil start handle.
Engine must not start.
4. Repeat steps 1 – 3 for lines B – D of the
table below.
5. If necessary, shut off unit. Turn ignition
switch to STOP.
IMPORTANT: If the system does not function
properly, do not operate the unit until repairs
are made.
NOTICE: Control settings that prevent engine
starting will stop a running engine.
EN - 17