SECTION 4 - BOOM & PLATFORM
3121623
– JLG Lift –
4-1
SECTION 4. BOOM & PLATFORM
4.1
BOOM MAINTENANCE
NOTICE
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
follows:
a.
Disconnect electrical cable from control
console.
b.
Tag and disconnect the hydraulic lines run-
ning to the rotate cylinders. Cap the hydrau-
lic 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 prop-
erly supported.
d.
Remove bolts and keeper pins that secures
the retaining pins. Using a suitable brass
drift and hammer, remove the retaining pins
from the platform support.
2.
Remove the boom from the turntable as follows:
a.
Disconnect wiring harness from ground
control harness connector.
NOTICE
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDIATELY
AFTER DISCONNECTING LINES TO AVOID ENTRY OF CONTAMINANTS
INTO SYSTEM.
b.
Tag and disconnect hydraulic lines from
boom to control valve. Use a suitable con-
tainer to retain any residual hydraulic fluid.
Cap all hydraulic lines and ports.
c.
Using a suitable lifting equipment, ade-
quately 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.
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 the lower boom
pivot pin. Using a suitable brass drift and
hammer, remove pin from the turntable.
g.
Using all applicable safety precautions, care-
fully lift boom assembly clear of turntable
and lower to ground or suitable supported
work surface.
Disassembly of the Main Boom
1.
Loosen jam nuts on aft end of fly boom wear pad
adjustment and loosen adjustments.
2.
Using a portable power source, attach hose to
telescope cylinder port block. Using all applica-
ble safety precautions, activate hydraulic system
and extend cylinder to gain access to cylinder
rod retaining pin. Shut down hydraulic system.
3.
Carefully disconnect hydraulic hose from retract
port of cylinder. There will be initial weeping of
hydraulic fluid which can be caught in a suitable
container. After initial discharge, there should be
no further leakage from the retract port.
4.
Remove hardware securing telescope cylinder to
the fly boom section, then remove pin from fly.
5.
Remove hardware securing telescope cylinder to
the base boom section.
NOTICE
WHEN REMOVING TELESCOPE CYLINDER FROM BOOM SECTIONS.
CARE SHOULD BE TAKEN NOT TO LEAVE CYLINDER REST ON POW-
ERTRACK WHICH COULD CAUSE DAMAGE TO POWERTRACK.
6.
Using a suitable lifting device, remove telescope
cylinder from boom sections.
7.
Using a piece of tape, mark the length of hoses
and wires from front of fly boom and bottom of
base boom for reassembly.
8.
Remove hardware securing the front wear pads
on base boom section, remove wear pads.
9.
Remove hardware securing the powertrack to
the aft end of the fly boom section.
10.
Using a suitable lifting device, remove fly boom
from boom section.
11.
Remove hydraulic lines and electrical cables
from powertrack.
12.
Remove hardware securing powertrack to the
base boom section. Remove powertrack.
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