JLG M450 Service Manual - Manual (Page 115)

SECTION 4 - BOOM & PLATFORM
3121829 – JLG Lift – 4-3
6. Using suitable lifting equipment, slide fly boom sec-
tion out to gain access to telescope cylinder attach
pin hole.
7. Measure the distance between the telescope cylin-
der port block attach point on base boom section
and the attach point on fly boom section.
8. Connect a suitable auxiliary hydraulic power source
to the telescope cylinder port block.
9. Extend the telescope cylinder the distance of the
two attach points.
10. Secure the sling and lifting device at the telescope
cylinder’s approximate center of gravity, and lift the
cylinder to the aft end of the boom assembly.
WHEN INSERTING THE TELESCOPE CYLINDER INTO THE BOOM,
CARE MUST BE TAKEN NOT TO DAMAGE THE POWER TRACK
ASSEMBLY.
11. Slowly slide the telescope cylinder into boom
assembly, align rod end with attach point in fly sec-
tion. Insert pin and secure with retaining ring.
12. Align bolt holes at aft end of base boom section with
telescope cylinder port block. Secure telescope cyl-
inder with hardware.
13. Install wear pads at end of base boom section.
Adjust the adjustable wear pads to zero clearance.
Adjust pads alternately side to side, so that fly boom
section is centered in base boom section.
14. Retract boom section fully. Adjust wear pads at aft
end of boom section to zero clearance. Adjust pads
alternately side to side, so that fly boom section is
centered in base boom section.
15. Disconnect auxiliary power source from telescope
cylinder.
Installation
1. Using suitable lifting equipment, position boom
assembly on upright so that boom pivot holes in
both boom and upright are aligned.
2. Install boom pivot pin, ensuring that location of the
hole in pivot pin aligns with attach point on upright.
3. Using all applicable safety precautions, operate lift-
ing equipment in order to position boom lift and
master cylinders so that holes in cylinder rod ends
and boom structure are aligned. Insert cylinder pins.
4. If necessary, gently tap pins into position with a soft
headed mallet, ensuring that attach holes in pins are
aligned with attach holes in boom structure. Secure
with hardware.
5. Connect all hosing and wiring.
6. Install the slave leveling cylinder to the boom
assembly.
7. Install the platform to the boom assembly.
8. Connect all hosing and wiring at platform control
station.
9. Using all safety precautions, operate machine sys-
tems and extend and retract boom for four or five
cycles.
10. Shut down machine systems and check for leakage.