JLG 150HAX Service Manual - Manual (Page 83)

SECTION 4 - BOOM & PLATFORM
3120817 – JLG Lift – 4-3
Tower Boom Removal
1. Remove main boom as outlined in Main Boom
Removal.
2. Shut down machine systems.
NOTE: Tower Boom Assembly weighs approximately 14,700
lb. (6,668 kg).
3. Using suitable lifting equipment, adequately support
boom weight along entire length of retracted boom.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
4. Tag and disconnect hydraulic lines that run along
the side of the boom, and also lines to main lift cylin-
der, upper master level cylinder, and tower tele-
scope cylinder.
5. Using suitable lifting equipment, adequately support
main lift cylinder.
6. Remove bolts and lockwashers securing main boom
lift cylinder barrel end to tower boom.
7. Using a slide hammer or similar tool, and taking care
not to damage pin, remove pin from tower boom.
8. Carefully remove main lift cylinder from tower boom
and place in a suitable work area.
9. Remove bolts and lockwashers securing tower lift
cylinder rod end attach pin to tower boom.
10. Using a slide hammer or similar tool, and taking care
not to damage pin, remove pin from tower boom.
11. Using all applicable safety precautions, and only if
necessary, operate tower lift down and fully retract
tower lift cylinder.
12. Shut down machine systems.
13. Tag and disconnect all wiring to ground control box.
14. Remove the bolts and lockwashers securing the
lower master cylinder rod end to the tower boom.
15. Using a slide hammer or similar tool, and taking care
not to damage pin, remove pin from tower boom.
Remove cylinder rod end from tower boom.
16. Remove bolts and lockwashers securing tower
boom pivot pin to turntable.
17. Ensuring that boom is adequately supported and
using a suitable slide hammer, carefully remove
pivot pin from tower boom and turntable. Ensure
that main boom and turntable are not damaged
18. Carefully lift tower boom assembly clear of turntable
and lower to ground or suitably supported work sur-
face.
Main Boom Disassembly
NOTE: Left or right is determined facing the machine from
the platform.
1. Loosen the right side powertrack bracket and pow-
ertrack and lay on top of boom assembly.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
2. Tag and disconnect hydraulic lines to slave level cyl-
inder and rotator motor.
3. Tag and disconnect wiring to platform control box.
4. Remove platform from end of main boom assembly.
5. Remove setscrews and bushing retaining telescope
cylinder rod attach pin to base section.