Disassemble main boom, Inspection, Disassemble main boom -2 inspection -2 – JLG 510AJ Service Manual User Manual
Page 200
SECTION 4 - BOOM AND PLATFORM
4-2
– JLG Lift –
3121181
Disassemble Main Boom
1.
Loosen jam nuts on aft end of fly boom wear pad adjust-
ment and loosen adjustments.
2.
Using a portable power source, attach hose to telescope
cylinder port block. Using all applicable safety precau-
tions, 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.
WHEN REMOVING TELESCOPE CYLINDER FROM BOOM
SECTIONS. CARE SHOULD BE TAKEN NOT TO LEAVE CYLIN-
DER REST ON POWERTRACK WHICH COULD CAUSE DAM-
AGE TO POWERTRACK.
6.
Using a suitable lifting device, remove telescope cylin-
der 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 pow-
ertrack.
12.
Remove hardware securing powertrack to base boom
section. Remove powertrack.
Inspection
1.
Inspect all boom pivot pins for wear, scoring or other
damage, and tapering or ovality. Replace pins as neces-
sary.
2.
Inspect lift cylinder pins for wear, scoring or other dam-
age, and tapering or ovality. Ensure pin surfaces are pro-
tected prior to installation. Replace pins as necessary.
3.
Inspect telescope cylinder rod attach pin for wear, scor-
ing or other damage. Replace pin as necessary.
4.
Inspect inner diameter of boom pivot bushings for scor-
ing, distortion, wear or other damage. Replace bushings
as necessary.
5.
Inspect wear pads for wear.
6.
Inspect all threaded components for damage such as
stretching, thread deformation, or twisting. Replace as
necessary.
7.
Inspect structural units of boom assembly for bending,
cracking, separation of welds, or other damage. Replace
boom sections as necessary.