JLG 150HAX Service Manual - Manual (Page 93)

SECTION 4 - BOOM & PLATFORM
3120817 – JLG Lift – 4-13
Main Boom Installation
1. Using suitable lifting equipment, position assembled
main boom on tower boom so that boom pivot holes
in main boom and tower boom are aligned.
2. Insert boom pivot pin, gently tapping pin into posi-
tion with a soft headed mallet if necessary. Secure
pin with bolts and lockwashers.
3. Align rod end of upper master cylinder with attach-
ing holes in level links. Install attach pin and secure
with setscrews.
4. Align horizontal level link with mounting hole in
tower boom and insert attach pin. Secure pin with
bolt and lockwasher.
5. Connect all wiring to ground control box.
6. Using all applicable safety precautions, operate lift-
ing equipment in order to position main boom lift
cylinder so that holes in cylinder rod end and boom
structure are aligned. Insert lift cylinder pin.
7. If necessary, gently tap pin into position with a soft
headed mallet, ensuring that pin plate holes are
aligned with attach holes in boom structure. Install
pin attaching bolts and lockwashers.
8. Shut down machine systems.
9. Connect hydraulic lines running along side of boom.
10. Using all applicable safety precautions, operate
machine systems and raise and extend boom fully,
noting the performance of the extension cycle. If
chattering is apparent, extend chain system requires
adjustment.
11. Retract and lower boom, noting performance of
retraction cycle. If chattering is apparent, retract
chain system requires adjustment.
12. Shut down machine systems.
13. If necessary, adjust extend and retract chain sys-
tems and secure adjustment locknuts.
14. As necessary, lubricate all points requiring lubrica-
tion.
4.2 BOOM CHAINS
Adjusting Procedures - Main Boom
ENSURE MACHINE IS ON A FIRM AND LEVEL SURFACE.
1. Position main boom fully retracted at +5 degrees
horizontal, no load in platform.
2. Extend main boom 3 feet (1 meter).
3. Torque retract chain adjuster to 50 ft. lb. (68 Nm),
then torque extend chain adjuster to 50 ft. lb. (68
Nm).
4. Retract main boom 1 foot (30.5 cm).
5. Check torque on extend chain adjuster.
6. Again retract main boom 1 foot (30.5 cm).
7. Recheck torque on extend chain adjuster.
8. Extend main boom 1 foot (30.5 cm).
9. Recheck retract chain adjuster torque.
10. Check for proper operation of main boom.