JLG 150HAX ANSI Service Manual - Manual (Page 90)

SECTION 4 - BOOM & PLATFORM
4-10 – JLG Lift – 3120679
Main Boom Assembly
NOTE: When installing fly section wear pads, install same
number and thickness of shims as were removed
during disassembly.
1. Install top and side aft fly section wear pads and
shims, as required, using bolts and lockwashers.
2. Using suitable lifting equipment, carefully slide fly
section into mid section.
NOTE: When installing mid section wear pads, install same
number and thickness of shims as were removed
during disassembly.
3. Install mid section top front wear pads and shims, as
required, using bolts and lockwashers.
4. Install mid section side front wear pads and shims,
as required, using bolts and lockwashers.
5. Install mid section bottom front wear pads and
shims, as required, using bolts and lockwashers.
6. Install mid section top aft wear pads and shims, as
required, using bolts and lockwashers.
7. Install mid section side aft wear pads and shims, as
required, using bolts and lockwashers.
8. Using suitable lifting equipment, carefully slide
assembled mid and fly sections into base section.
9. Place fly section extend chain assembly along tele-
scope cylinder chain rest with front end of chain
hanging just below cylinder sheave.
10. Using lightweight motor oil (SAE 20W), adequately
lubricate portion of chain occupying cylinder chain
rest.
11. Using suitable lifting equipment, maneuver tele-
scope cylinder and fly section extend chain assem-
bly into position at aft end of assembled boom
sections.
12. Attach loose end of extend chain to chain clevis at
lower aft end of fly section. Install chain attach pins
and flatwashers and secure with cotter pins.
13. Secure chain clevis to bottom aft of fly section with
clevis pins and cotter pins.
14. If removed, install chain attach plate to aft end of
base section. Secure with bolts, washers, and lock-
washers.
15. With a slight downward angle on the cylinder, insert
sheave and chain into boom sections until it is possi-
ble to insert chain adjust clevis into chain attach
plate at aft end of base section. Install chain adjust
clevis and locknuts.
16. Carefully feed telescope cylinder approximately half-
way into boom sections, lubricating chain with light-
weight motor oil as it passes along chain rest.
Continue inserting into boom sections.
17. Install fly section retract chain sheave at aft end of
mid section.
18. Install sheave pin and if necessary, tap pin into place
using a soft headed mallet. Secure pin with set-
screws.
19. Install lubrication fitting on end of pin and lubricate
sheave with MPG.
20. Attach fly section retract chain to chain clevis at
lower aft end of fly section. Install chain attach pins
and flatwashers and secure with cotter pins.
21. Carefully place fly section retract chain around chain
sheave at aft end of mid section and through bottom
of base section.
22. Install fly section retract chain clevis into attach
block at lower front end of base section. Install
adjust nut and locknut on clevis. Install clevis cover
on bottom of base section and secure in place with
bolts and lockwashers.
23. Using suitable lifting equipment, carefully align holes
in telescope cylinder trunnion and holes in aft end of
mid section.