JLG 120HX ANSI Service Manual - Manual (Page 78)

SECTION 2 - PROCEDURES
2-58 – JLG Lift – 3120686
9. If boom does not stop at white tape or boom can be
extended after being retracted 10 feet (3 meters)
without resetting, system must be repaired by JLG
authorized service personnel before machine can be
used.
2.27 LOAD MANAGEMENT SYSTEM
ADJUSTMENT
1. With boom retracted, limit switch and proximity
switch are in neutral position.
2. Extend boom in horizontal position until white tape
on inner mid boom is fully exposed, no load in plat-
form.
3. Adjust proximity switch actuator to trip switch, then
secure locking nut.
4. Adjust proximity switch target until LED just turns on,
then secure locking nut.
5. To test cutoff switches, retract boom to reset posi-
tion, then extend boom to test cutoff. Do not extend
boom past white tape.
6. To test limit switch, retract boom to reset, then
extend boom to cutoff while holding test bypass
switch in “M” position. To test proximity switch,
retract boom to reset, then extend boom to cutoff
while holding test bypass switch in “P” position.
When testing switches, do not extend boom past
white tape on inner mid boom.
2.28 TURNTABLE SPRINGS
Removal
1. Fully retract boom.
2. Remove rear turntable cover.
3. Remove the five (5) nuts and jam nuts from beneath
the turntable which attach to the turntable spring
bolts.
4. If necessary, remove the bolts which secure the load
management switches to the mounting bracket and
allow the switches to hang freely.
WRAP MASKING TAPE AROUND THE LOAD MANAGEMENT
SWITCHES TO INSURE THAT THE SWITCHES WILL STILL BE
OPERABLE.
5. Position boom to horizontal.
6. Remove the five (5) bolts and turntable springs from
the turntable.
Installation
1. Position boom to horizontal.
2. Install the five (5) bolts and turntable springs onto
the turntable.
3. Install the five (5) nuts and jam nuts on the turntable
bolts.
4. Extend boom to cutoff position then retract boom
until turntable raises 0.25 in. (6.4 mm) from cutoff
position, measured at spring area.
5. Snug jam nuts, then fully retract boom.
6. Torque jam nuts to 75 ft. lb. (102 Nm), then tighten
nuts.
7. If removed, install load management switches on
mounting brackets.
8. Position boom to horizontal. Refer to paragraph 2-25
and adjust load management switches as required.
2.29 DRIVE MOTOR ADJUSTMENT
PROCEDURE
1. Remove the cap nut from adjustment screw.
2. Loosen jam nut on the adjustment screw and make
adjustment.
3. Measure from top of jam nut to the end of adjust-
ment screw. (Figure 2-29., Drive Motor Adjustment)
4. Tighten jam nut, install cap nut.
NOTE: The “o” ring must be seated in groove in cap nut.