GB-8
CONTROLS AND FEATURES
See Figure 4 for controls and features locations.
SAFETY INTERLOCK SYSTEM
Check Safety Interlock System
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.
988105, 108, 123, 126
To test:
1. With engine off, set controls as listed in line A of the
table below.
2. Turn electric start model ignition switch to Start.
Engine must not crank.
3. Turn 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. Shut off the unit, if necessary. See Shut Off and "To
stop mowing."
IMPORTANT: If the system does not function properly, do
not operate the unit until repairs are made.
NOTE: Control settings that prevent engine starting will stop
a running engine.
988120, 124, 125, 127
To test:
1. With engine off, set controls as listed in line A of the
table below and try to start the engine.
IMPORTANT: If the system does not function properly, do
not operate the unit until repairs are made.
2. Repeat step 1 for lines B-E of the table.
*Test the left and right operator presence controls
separately.
3. With engine running, set controls as listed in line A of
the table below and check the result.
IMPORTANT: If the system does not function properly, do
not operate the unit until repairs are made.
4. Repeat step 3 for lines B-E of the table.
*Perform this test with PTO properly engaged.
**Release both operator presence controls for this test.
NOTE: PTO should only engage when the parking brake is
off AND at least one operator presence control is engaged.
PTO should disengage when BOTH operator presence con-
trols are released.
OPERATION
WARNING: AVOID INJURY. Read and
understand the entire Safety section before
proceeding.
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. See Check Safety Interlock System on
page 8 for testing instructions.
PTO
PARKING BRAKE
SPEED CONTROL
LEVERS IN NEUTRAL
KEY
OPERATOR PRESENCE
CONTROL
ENGINE
A
OffOnNoOnOffOff
B
Off Off Yes On Off Off
C
On On Yes On Off Off
D
OffOnNoOnOnOff
ENGINE OFF TEST
PARKING BRAKE
OPERATOR
PRESENCE CONTROL
*
PTO
ENGINE
A
On On Off Starts
B
On Off Off Starts
C
Off Off Off Doesn’t Start
D
Off On Off Doesn’t Start
E
Off Off On Doesn’t Start
ENGINE RUNNING TEST
PARKING BRAKE
OPERATOR
PRESENCE CONTROL
PTO
ENGINE
A
On Off
Won’t
Engage
Runs
B*
On Off Disengages Runs
C
Off On Engages Runs
D*
Off Off** Engaged
Stops
Running
E
Off Off Off
Stops
Running
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