JLG E300 Service Manual - Manual (Page 101)

SECTION 4 - BOOM & PLATFORM
3121253 – JLG Lift – 4-3
NOTE: The telescope cylinder weighs approximately 53 lbs.
(24 kg).
6. Using a suitable lifting device, remove telescope cyl-
inder from the rear of the boom sections.
7. Remove hardware securing the front wear pads on
base boom section, remove wear pads and shims,
noting the location and amount of shims to aid in
reassembly.
NOTE: The fly boom section weighs approximately 188 lbs.
(85 kg).
8. Using a suitable lifting device, remove fly boom from
boom section.
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. Lubricate the boom sections as shown in Figure 4-
2., Boom Lubrication Instructions.
2. Using JLG P/N 0100011 thread locking compound
or equivalent, install the bottom wear pads and
shims as noted during disassembly on the rear of
the fly section. Torque the retaining bolts to 40 ft.lbs.
(55 Nm). Install the rest of the wear pads on the rear
of the fly section but do not install the shims or
torque them at this time.
3. Using an adequate lifting device, slide the fly boom
section into the base boom section. Install the
remaining shims on the rear of the fly section as
noted during disassembly and torque the retaining
bolts to 40 ft.lbs. (55 Nm). Pull the fly section out of
the base section enough to install the pin that
secures the telescope cylinder rod to the fly boom
section.
4. Using JLG P/N 0100011 thread locking compound
or equivalent, install the front wear pads and shims
as noted during disassembly on the base boom sec-
tion. Torque the retaining bolts to 40 ft.lbs. (55 Nm).
5. Using an adequate lifting device, install the tele-
scope cylinder into the boom assembly. It will aid
assembly if the cylinder is extended to enable con-
nection to the fly boom section.
6. Align the telescope cylinder rod end with the corre-
sponding hole in the fly boom section. If necessary,
attach a portable power supply to the cylinder to
extend or retract the cylinder for alignment. Install
the retaining pin and secure it in place with the
retaining ring.
7. Using JLG P/N 0100011 thread locking compound
or equivalent, secure the rear of the telescope cylin-
der to the base boom section with the attaching
bolts and washers. Torque the bolts 95 ft.lbs. (129
Nm).