JLG X23J - X700AJ Service Manual - Manual (Page 400)

SECTION 4 - BOOM & PLATFORM
3121448 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
4.1 BOOM MAINTENANCE
IF PERFORMING MAINTENANCE ON THE BOOM, DO NOT USE A
LIFTING DEVICE TO LIFT THE BOOMS UNLESS THE HOLDING
VALVES HAVE BEEN REMOVED FIRST. FAILURE TO DO SO WILL
RESULT IN SEVERE DAMAGE TO THE BOOM.
Removal of the Boom Assembly
1. Remove the platform and platform support as fol-
lows:
a. Disconnect electrical cable from control con-
sole.
b. Tag and disconnect the hydraulic lines running
to the rotate cylinders. Cap the hydraulic lines
and ports.
c. Using an overhead crane or suitable lifting
device, use nylon support straps to support the
platform/support.
NOTE: When removing the retaining pin from the rod end of
the level cylinder, make sure the cylinder is properly
supported.
a. Remove bolts and keeper pins that secures the
retaining pins. Using a suitable brass drift and
hammer, remove the retaining pins from the plat-
form support.
1. Remove the boom from the turntable as follows:
a. Disconnect wiring harness from ground control
harness connector.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
b. Tag and disconnect hydraulic lines from boom
to control valve. Use a suitable container to
retain any residual hydraulic fluid. Cap all
hydraulic lines and ports.
c. Using a suitable lifting equipment, adequately
support boom weight along entire length.
d. Remove the bolts and keeper pins securing the
lift cylinder pivot pin. Using a suitable brass drift
and hammer, remove the pivot pin from the
lower boom.
Figure 4-1.