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Operator's Manual
Third Edition • Second Printing
Part No. 97779 GR-12 • GR-15 • GR-20 19
FUNCTION TESTS
36 Raise the platform.
Result: Before the platform is raised
approximately 30 cm, the lift
function should stop, an alarm
should sound and the LED
readout should display LL.
37 Press the drive function select button.
38 Press and hold the function enable switch and
slowly move the control handle in the direction
indicated by the blue arrow, then in the
direction indicated by the yellow arrow.
Result: The drive function should not work in
either direction.
39 Lower the platform and drive the machine off
both pieces of wood.
Test Limited Drive Speed
40 Press the lift function select button.
41 Press and hold the function enable switch on
the control handle. Raise the platform
approximately 60 cm from the ground.
42 Press the drive function select button.
43 Press and hold the function enable switch on
the control handle. Slowly move the control
handle to the full drive position.
Result: The maximum achievable drive speed
with the platform raised should not exceed
20 cm per second.
If the drive speed with the platform raised exceeds
20 cm per second, immediately tag and remove
the machine from service.
Test the Pothole Guards
Note: The pothole guards should automatically
deploy when the platform is raised. The pothole
guards activate another limit switch which allows
the machine to continue to function. If the pothole
guards do not deploy, an alarm sounds and the
machine will not drive.
44 Raise the platform.
Result: When the platform is raised 1.2 m from
the ground, the pothole guards should deploy.
45 Press on the pothole guards on one side, and
then the other.
Result: The pothole guards should not move.
46 Lower the platform.
Result: The pothole guards should return to the
stowed position.
47 Place a 2x4 or similar piece of wood under a
pothole guard. Raise the platform.
Result: Before the platform is raised 2.1 m from
the ground, an alarm should sound and the drive
function should not work.
48 Lower the platform and remove the 2x4.