JLG 150HAX Service Manual - Manual (Page 89)

SECTION 4 - BOOM & PLATFORM
3120817 – JLG Lift – 4-9
13. Using suitable lifting equipment, carefully slide tele-
scope cylinder out of fly and mid sections 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.
14. Remove bolts and lockwashers which attach mid
section top aft wear pads and remove pads and any
shims.
15. Remove bolts and lockwashers which attach mid
section side aft wear pads and remove pads and
any shims.
16. Remove bolts and lockwashers which attach mid
section bottom front wear pads and remove pads
and any shims.
17. Remove bolts and lockwashers which attach side
wear pads to front of mid section and remove pads
and any shims.
18. Remove bolts and lockwashers which attach top
wear pads to front of mid section and remove pads
and any shims.
19. Using suitable lifting equipment, carefully slide fly
section clear of mid section and lower to ground or
suitably supported work area.
20. Remove bolts and lockwashers which attach top aft
wear pads to fly section and remove pads and any
shims.
21. Remove bolts and lockwashers which attach side aft
wear pads to fly section and remove pads and any
shims.
22. If necessary, remove bolt and lockwasher securing
horizontal level link attach pin to fly section. Using a
slide hammer or other suitable tool, remove pin from
fly section and remove level link and bushings.
23. If necessary, remove bolt and lockwasher securing
barrel end of upper master cylinder to fly section.
Using a slide hammer or other suitable tool, remove
pin from fly section and remove cylinder.
Inspection
1. Inspect all sheaves (extend chains, retract chains
and telescope cylinder) for excessive groove wear,
burrs or other damage. Replace sheaves as neces-
sary.
2. Inspect extend chain and retract chain sheave bush-
ings for wear, scoring, or other damage, and for
ovality. Replace bushings as necessary, ensuring
they are installed flush with sheave surface.
3. Inspect extend chain and retract chain sheave pins
for scoring, tapering, ovality and evidence of correct
lubrication. Replace pins as necessary.
4. Inspect telescope cylinder sheave pin for tapering,
scoring, ovality and evidence of correct lubrication.
Replace pin as necessary.
5. Inspect boom pivot pin for wear, scoring or other
damage, and for tapering or ovality. Replace pin as
necessary.
6. Inspect upper lift cylinder attach pin for tapering,
ovality, scoring, wear, or other damage. Ensure pin
surfaces are protected prior to installation. Replace
pin as necessary.
7. Inspect telescope cylinder trunnion attach pins for
tapering, ovality, scoring, wear, or other damage.
Replace pins as necessary.
8. Inspect extend chain attach clevis pins for wear,
scoring, or other damage. Replace pins as neces-
sary.
9. Inspect telescope cylinder rod attach pin for scoring,
wear, or other damage. Replace pin as necessary.
10. Inspect inner diameter of boom pivot bushing for
scoring, distortion, wear, or other damage. Replace
bushing as necessary.
11. Inspect all wear pads for excessive wear or damage.
Replace pads when worn to within 1/8 in. (3.2 mm)
of insert.
12. Inspect extend and retract chains and chain attach
component for cracks, stretching, distortion, or
other damage. Replace components as necessary.
13. Inspect all threaded components for damage such
as stretching, thread deformation, or twisting.
Replace as necessary.
14. Inspect structural units of boom assembly for bend-
ing, cracking, separation of welds, or other damage.
Replace boom sections as necessary.