JLG 120-SXJ ANSI Service Manual - Manual (Page 58)

SECTION 4 - BOOM & PLATFORM
4-6 – JLG Lift – 3121105
7. Install outer mid section bottom front wear pads and
shims, as required, using bolts and lockwashers.
8. Install outer mid section upper aft wear pads and
shims, as required, using bolts and lockwashers.
9. Using suitable lifting equipment, carefully slide
assembled outer mid and fly sections into inner mid
section.
NOTE: When installing inner mid section wear pads, install
same number and thickness of shims as were
removed during disassembly.
10. Install inner mid section top front wear pads and
shims, as required, using bolts and lockwashers.
11. Install inner mid section side front wear pads and
shims, as required, using bolts and lockwashers.
12. Install inner mid section bottom front wear pads and
shims, as required, using bolts, washers and lock-
washers.
13. Install inner mid section upper aft wear pads and
shims, as required, using bolts and lockwashers.
14. Install fly section retract chain adjust block on lower
front end of inner mid section and secure with bolts.
15. Place outer mid section extend chain assembly
along telescope cylinder chain rest with chain adjust
assembly hanging just below cylinder sheave.
16. Using lightweight motor oil (SAE 20W), adequately
lubricate portion of chain occupying cylinder chain
rest.
17. Using suitable lifting equipment, maneuver tele-
scope cylinder and outer mid section extend chain
assembly into position at aft end of assembled
boom sections.
18. With a slight downward angle on the cylinder, insert
sheave and chain adjust into boom sections until it
is possible to insert chain adjust into attach block at
rear of outer mid section. Temporarily install chain
adjust and locknuts.
19. Carefully feed telescope cylinder approximately half-
way into boom sections, lubricating chain with light-
weight motor oil as it passes along chain rest. Attach
extension bar to chain and continue inserting into
boom sections.
20. Install fly section retract chain sheaves, seals and
thrustwashers at aft end of outer mid section.
21. Install sheave pins and if necessary, tap pins into
place using a soft headed mallet. Secure pins with
setscrews.
22. Install lubrication fittings on ends of pins and lubri-
cate sheaves with MPG.
23. Install fly section retract chains at lower aft end of fly
section. Install chain attach pins and flatwashers and
secure with cotter pins.
24. Carefully place fly section retract chains around
chain sheaves at aft end of inner mid section and
through bottom of inner mid section.
25. Install fly section retract chain clevis into attach
block at lower front end of inner mid section. Install
adjust nut and locknut on clevis.
26. Install outer mid section retract chain sheaves and
thrust washers at aft end of inner mid section.
27. Install sheave pins and, if necessary, tap pins into
place using a soft headed mallet. Secure pins with
setscrews.
28. Install lubrication fittings on ends of pins and lubri-
cate sheaves with MPG.
29. Install outer mid section retract chains at lower aft
end of outer mid section. Install chain attach pins
and flatwashers and secure with cotter pins.
30. Carefully place outer mid section retract chains
around chain sheaves at aft end of inner mid sec-
tion. Tie chains to underside of inner mid section
using suitable straps.
31. Using suitable lifting equipment, carefully align holes
in telescope cylinder trunnion and holes in aft end of
inner mid section.
32. Install trunnion pins, ensuring that holes in pins align
with holes in trunnion. If necessary, tap pins into
place with a soft headed mallet. Secure pins with
setscrews.
33. Using suitable lifting equipment, carefully slide
assembled inner mid, outer mid, and fly sections
into base section.
34. As sections are being installed, remove straps from
outer mid section retract chains and feed attach cle-
vis through holes in bottom of forward end of base
section.