JLG 150HAX ANSI Service Manual - Manual (Page 86)

SECTION 4 - BOOM & PLATFORM
4-6 – JLG Lift – 3120679
6. Using a suitable brass drift, carefully drive telescope
cylinder pin from base section.
7. Remove three locknuts and flatwashers from studs
on top of aft end of base section.
8. Remove fly section extend chain adjust nut, locknut,
and washer from chain attach plate at upper aft end
of base section.
9. Remove bolts, washers and lockwashers attaching
fly section extend chain attach plate to upper aft end
of base section. Remove plate.
10. Remove six bolts and lockwashers securing retract
chain clevis cover to lower front bottom of base sec-
tion.
11. Remove fly section retract chain adjust nut, locknut,
and washer at lower front end of base section.
NOTE: Note and record the number and thickness of any
wear pad shims during wear pad removal.
12. Remove bolts and lockwashers attaching side wear
pads to front of base section. Remove pads and any
shims.
13. Remove bolts, washers and lockwashers attaching
lower front wear pads and mounting blocks to base
section. While supporting assembled fly and mid
sections, remove wear pads, mounting blocks and
shims.
14. Remove bolts and lockwashers attaching top front
wear pads to base section. Remove pads and
shims.
15. Using suitable lifting equipment, partially slide
assembled mid and fly sections out of base section.
16. Using suitable straps, tie off fly section retract chains
to underside of mid section as mid and fly sections
are exiting base section.
17. Carefully lift mid and fly sections clear of base sec-
tion and lower to a suitably supported work area.
18. Using suitable lifting equipment, support telescope
cylinder rod.
19. Remove two bolts, washers, and lockwashers secur-
ing each trunnion pin cover to mid section.
20. Using a suitable tool, scribe a line on the outer end
of each trunnion pin and boom structure as an aid to
pin alignment during boom assembly.
21. Using a suitable slide hammer, remove trunnion pins
attaching telescope cylinder to mid section.
22. Remove cotter pins and chain attach pins attaching
fly retract chains to chain clevis at lower aft end of fly
section and remove chains.
23. Remove setscrews which attach retract chain
sheave pin at lower aft end of mid section.
24. Using a suitable brass drift, carefully drive sheave
pin from mid section and remove sheave. If neces-
sary, remove bushings from sheave and replace.
Ensure that pins, grease fittings and corresponding
boom and sheave surfaces are not damaged.
25. Pull fly section out several feet to allow ample clear-
ance for telescope cylinder removal.
26. Using suitable lifting equipment, carefully slide tele-
scope cylinder out of fly and mid sections, along
with extension chain.
27. Carefully lift telescope cylinder clear of boom
assembly and lower to ground or suitably supported
work area.
NOTE: Note and record number and thickness of any wear
pad shims during wear pad removal.
28. Remove bolts and lockwashers which attach upper
aft mid section wear pads and remove pads and any
shims.