Boom Components; Boom Angle Limit Switch (All Models Except Gth-636) - Genie GTH-636 Service Manual

Section 4 • Repair Procedures

Boom Components

1-1
Boom Angle Limit Switch
(all models except GTH-636)
How to Adjust the Limit Switch
Note: Perform this procedure on a firm, level
surface.
1 Start the engine.
2 GTH-1056: Raise the boom to 55°. Confirm with
a digital level.
All other models: Raise the boom to 60°.
Confirm with a digital level.
3 Working at the pivot end of the boom, locate
and loosen the fasteners of the limit switch
collar on the boom pivot at the exhaust side of
the machine.
a
a boom pivot
4 Rotate the collar until the bottom of the collar
ramp just contacts the roller head of the limit
switch. Refer to the illustration below.
Note: Be sure the collar is parallel to the side of the
boom.
4 - 2 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
5 Securely tighten the collar set screws.
6 Lower the boom approximately 6 feet / 2 m.
7 GTH-1056: Raise the boom to 55°. Confirm with
a digital level.
All other models: Raise the boom to 60°.
Confirm with a digital level.
8 Place the transmission into reverse 3. Release
the parking brake.
Result: The machine should not move and the
alarm should not sound. The limit switch is
properly calibrated.
Result: The machine moves and the alarm
sounds. The limit switch is not calibrated
correctly. Repeat this procedure beginning with
step 2.
Result: The machine moves and the alarm
sounds. The limit switch is faulty. Replace the
limit switch and repeat this procedure beginning
with step 2.
9 Lower the boom 10°.
Result: The machine moves and the alarm
sounds. The limit switch is calibrated correctly.
Result: The machine does not move and the
alarm stops sounding. The limit switch collar is
not parallel to the side of the boom. Repeat this
procedure beginning with step 3.
10 Continue to lower the boom in 10° increments
and test the drive function until the boom is in
the stowed position.
Result: The machine moves and the alarm
sounds. The limit switch is calibrated correctly.
Result: The machine does not move and the
alarm stops sounding. The limit switch collar is
not parallel to the side of the boom. Repeat this
procedure beginning with step 3.
June 2007
REV C
Part No. 97487