Section 4. boom and platform, 1 boom maintenance, Remove boom assembly – JLG 510AJ Service Manual User Manual
Page 199: Section, 4 - boom and platform, Boom maintenance -1, Remove boom assembly -1, Location of components - boom removal -1
SECTION 4 - BOOM AND PLATFORM
3121181
– JLG Lift –
4-1
SECTION 4. BOOM AND PLATFORM
4.1
BOOM MAINTENANCE
DO NOT USE A LIFTING DEVICE TO LIFT BOOMS UNLESS
HOLDING VALVES ARE REMOVED FIRST. FAILURE TO DO SO
WILL CAUSE SEVERE DAMAGE TO THE BOOM.
Remove Boom Assembly
1.
Remove platform and platform support as follows:
a. Disconnect electrical cable from control console.
b. Tag and disconnect hydraulic lines to rotate cylin-
ders. Cap hydraulic lines and ports.
c. Use an overhead crane or suitable lifting device and
nylon straps to support platform/support.
NOTE:
When removing retaining pin from rod end of level cylin-
der, make sure cylinder is properly supported.
d. Remove bolts and keeper pins securing retaining
pins. Using a suitable brass drift and hammer,
remove retaining pins from platform support.
2.
Remove boom from turntable as follows:
a. Disconnect wiring harness from ground control har-
ness connector.
CAP HYDRAULIC LINES AND PORTS IMMEDIATELY AFTER
DISCONNECTING LINES TO PREVENT ENTRY OF CONTAMI-
NANTS INTO SYSTEM.
b. Tag and disconnect hydraulic lines from boom to
control valve. Use suitable container to retain resid-
ual hydraulic fluid. Cap all hydraulic lines and ports.
c. Using suitable lifting equipment, adequately sup-
port boom weight along entire length.
d. Remove bolts and keeper pins securing lift cylinder
pivot pin. Using a suitable brass drift and hammer,
remove pivot pin from lower boom.
NOTE:
To gain access for removal of pivot pins, it may be neces-
sary to remove ground control box, hydraulic and fuel
tanks, and counterweight.
e. Remove hardware securing the level link pivot pin.
Using a suitable brass drift and hammer, remove the
pin from the level link and turntable.
f.
Remove hardware securing lower boom pivot pin.
Using a suitable brass drift and hammer, remove pin
from turntable.
g. Using all applicable safety precautions, carefully lift
boom assembly clear of turntable and lower to
ground or suitable supported work surface.
Figure 4-1. Location of Components - Boom Removal