JLG X23J - X700AJ Service Manual - Manual (Page 401)

SECTION 4 - BOOM & PLATFORM
4-2 – JLG Lift – 3121448
a. 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.
b. f. Remove hardware securing the lower boom
pivot pin. Using a suitable brass drift and ham-
mer, remove pin from the turntable.
c. g. Using all applicable safety precautions, care-
fully lift boom assembly clear of turntable and
lower to ground or suitable supported work sur-
face.
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 tele-
scope cylinder port block. Using all applicable
safety precautions, activate hydraulic system and
extend cylinder to gain access to cylinder rod retain-
ing 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 SEC-
TIONS. CARE SHOULD BE TAKEN NOT TO LEAVE CYLINDER REST
ON POWERTRACK WHICH COULD CAUSE DAMAGE TO POW-
ERTRACK.
6. Using a suitable lifting device, remove telescope cyl-
inder 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.
Inspection
1. Inspect all boom pivot pins for wear, scoring or other
damage, and for tapering or ovality. Replace pins as
necessary.
2. Inspect lift cylinder pins for wear, scoring or other
damage, and for tapering or ovality. Ensure pin sur-
faces are protected prior to installation. Replace pins
as necessary.
3. Inspect telescope cylinder rod attach pin for wear,
scoring or other damage. Replace pin as necessary.
4. Inspect inner diameter of boom pivot bushings for
scoring, 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 bend-
ing, cracking, separation of welds, or other damage.
Replace boom sections as necessary.
Assembly of the Main Boom
1. Install power track to the attach point on the base
boom section. Secure power track with the attaching
hardware.
2. Install hydraulic lines and electrical cables into the
power track.
3. Install wear pads to the aft end of the fly section.
4. Using suitable lifting equipment, slide fly section into
the base section until power track attach point aligns
with holes in side of base section.
5. Attach the power track to the aft end of fly boom
section. Secure power track with the attaching hard-
ware.