JLG 800A_AJ ANSI Service Manual - Manual (Page 219)

SECTION 4 - BOOM & PLATFORM
3120740 – JLG Lift – 4-5
3. Using a suitable brass drift and hammer, remove
hardware securing the upper lift cylinder rod end pin
to the base boom section. Remove the upper lift cyl-
inder pin from base boom. Retract the upper lift cyl-
inder by using the auxiliary power switch.
4. Remove the Master Cylinder as follows:
a. Using an adequate supporting device, support
the master cylinder so it doesn’t fall when the
retaining pins are removed.
NOTE: The master cylinder weighs approximately 58.5 lbs.
(26.5 kg).
b. Tag and disconnect hydraulic lines from Master
Cylinder. Use a suitable container to collect any
residual hydraulic fluid. Cap hydraulic lines and
ports.
c. Remove the bolt and keeper pin securing the
master cylinder barrel end pin to the base boom
section. Next, install a 3/8-16 UNC threaded lift-
ing eye into the threaded hole of the pin and pull
pin out.
d. Remove the bolt and keeper pin securing the
master cylinder rod end pin to the upright.
Remove the pin.
NOTE: When installing the master cylinder rod end pin,
insert the keeper hardware pin to prevent the pin
from inserting too far.
5. Remove the bolt and keeper pin securing the boom
pivot pin to the upright. Using a suitable brass drift
and hammer, remove the pivot pin from upright.
6. Using all applicable safety precautions, carefully lift
boom assembly clear of upright and lower to ground
or suitably supported work surface.
NOTE: The upper boom alone weighs approximately 2226
lbs. (1010 kg). Including the slave cylinder, rotator,
and platform support the assembly weighs approxi-
mately 3185 lbs. (1445 kg).