JLG 120-SXJ ANSI Service Manual - Manual (Page 59)

SECTION 4 - BOOM & PLATFORM
3121105 – JLG Lift – 4-7
35. Install outer mid section retract chain clevis into
attach block at lower front end of base boom sec-
tion. Install adjust nut and locknut on clevis.
NOTE: When installing base section wear pads, install same
number and thickness of shims as were removed
during disassembly.
36. Install base section top front wear pads and shims,
as required, using bolts and lockwashers.
37. Install base section lower front wear pads, mounting
blocks, and shims, as required, using bolts, wash-
ers, and lockwashers.
38. Install base section side front wear pads and shims,
as required, using bolts and lockwashers.
39. Carefully align telescope cylinder rod end with holes
in aft end of base boom section and install attach
pin. If necessary, tap pin into place using a soft
headed mallet. Secure pin with cotter pins.
40. Install outer mid section extend chain attach block at
aft end of base section and secure with bolts and
lockwashers.
41. Install outer mid section extend chain clevis through
hole in attach block and secure with adjust nut and
locknut.
42. Attach platform to boom assembly.
43. Attach the left side powertrack to boom assembly.
44. Connect wiring to platform control box.
45. Connect hydraulic lines to slave level cylinder and
rotator motor.
46. Attach the right side powertrack bracket and power-
track to boom assembly.
Installation
1. Using suitable lifting equipment, position assembled
boom on turntable so that boom pivot holes in both
boom and turntable are aligned.
2. Insert boom pivot pin, ensuring that locating slots in
pin are aligned with setscrew locating holes in pin
bushings.
3. If necessary, gently tap pin into position with a soft
headed mallet. Secure pin with setscrews.
4. Connect all wiring to ground control box.
5. Using all applicable safety precautions, operate lift-
ing equipment in order to position boom lift cylinder
so that holes in cylinder rod end and boom structure
are aligned. Insert lift cylinder pin.
6. If necessary, gently tap pin into position with a soft
headed mallet, ensuring that pin plate holes are
aligned with attach holes in boom structure. Install
pin attaching bolts, washers and lockwashers.
7. Shut down machine systems.
8. Connect hydraulic lines running along side of boom.
9. Install boom length/angle sensor box. Adjust boom
length/angle sensor box in accordance with para-
graph 2-30.
10. Using all applicable safety precautions, operate
machine systems and raise and extend boom fully,
noting the performance of the extension cycle. If
chattering is apparent, extend chain system requires
adjustment.
11. Retract and lower boom, noting performance of
retraction cycle. If chattering is apparent, retract
chain system requires adjustment.
12. Shut down machine systems.
13. Adjust extend and retract chain systems as required
and secure adjustment locknuts.
14. As necessary, lubricate all points requiring lubrica-
tion.
4.2 BOOM CHAINS
Adjusting Procedures
ENSURE MACHINE IS ON A FIRM AND LEVEL SURFACE.
1. Position boom fully retracted at +5 degrees horizon-
tal, no load in platform.
2. Torque outer mid section extend chain adjuster to 59
ft. lb. (80 Nm).
3. Torque outer mid section retract chain adjuster to 59
ft. lb. (80 Nm).
4. Torque fly section extend chain adjuster to 59 ft. lb.
(80 Nm).
5. Torque fly section retract chain adjuster to 59 ft. lb.
(80 Nm).
6. Cycle boom (extend at least 6 feet (2 meters), then
retract fully).
7. Recheck outer mid section extend chain.