JLG 4017 Service Manual - Manual (Page 32)

Boom
3.8 4017
3.3.7 Fourth Boom Section Installation
1. Apply Loctite 242 ® to the wear pad mounting bolts.
Install the bottom rear wear pads, washers and bolts.
Torque to 90 Nm (66 lb-ft). Install the bottom rear left
and right side wear pads, backing plate and bolts (do
not shim or tighten bolts). Install top rear wear pads,
backing plates and bolts (front bolts are drilled and
tapped for grease fittings. Do not shim or tighten
bolts). Install both extend chains (1) on bottom rear
of fourth boom section. Lay extend chains the length
of fourth boom section.
2. Grease the inside third boom section on area’s
where the fourth boom section wear pads will slide.
3. Using a suitable sling, balance the fourth boom
section and carefully slide 914 mm to 1219 mm
(3 ft to 4 ft) into the front of the third boom section.
Set the fourth boom section head onto suitable
support and reset sling under the boom head of the
fourth boom section. Carefully slide the fourth boom
section into the third boom section. Leave
1829 mm to 2438 mm (6 ft to 8 ft) of the fourth boom
section out to be able to install wear pads in front of
the third boom section.
4. With the sling still under boom head, apply Loctite
242 ® to the wear pad mounting bolts and install the
top wear pads, washers and bolts in the front of the
third boom section. Torque to 90 Nm (66 lb-ft). Lower
the fourth boom section, apply Loctite 242
® to the
wear pad mounting bolts and install bottom wear
pads, backing plates, shims and bolts in the front of
the third boom section. Torque to 90 Nm (66 lb-ft).
Apply Loctite 242
® to the wear pad mounting bolts
and install both left side and right side front wear
pads, backing plates, shims and bolts in the front of
the third boom section. Torque to 90 Nm (66 lb-ft).
Note: Grease wear pads, inside sheaves, bores and
pins during assembly.
5. Apply Loctite 242 ® to the sheave mounting bolts,
Install the sheave (2), pin, lock plate and bolts at the
bottom front of the third boom section. Torque bolts to
90 Nm (66 lb-ft). Grease the sheave using the grease
fitting in the pin. Spin the sheave by hand to ensure
the sheave spins freely on the pin and to distribute
grease evenly. Pull both extend chains from the fourth
boom section around the front and over the sheave.
Install both chain clevises, pins and clips.
6. Retract the fourth boom section the remainder of the
way into the third boom section and install the wear
pads at the rear of third and fourth boom sections.
7. Apply Loctite 242 ® to the wear pad mounting bolts
and install the bottom left and right side wear pads,
backing plates, shims and bolts. Shim the top wear
pads on the rear of the fourth boom section. Shim
the top left and right wear pads on the rear of the
fourth boom section. Torque bolts to 90 Nm (66 lb-ft).
Torque grease fitting bolts to 45 Nm (33 lb-ft).
MZ0770
1
MZ0980
2
Third Boom Section