JLG 4017 Service Manual - Manual (Page 33)

3.9 4017
Boom
3.3.8 Third & Fourth Boom Section
Installation
1. At the rear of the third boom section apply Loctite
242 ® to the wear pad mounting bolts and 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 the 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 on the bottom rear
of the third boom section. Lay extend chains the
length of third boom section.
2. Grease the inside second boom section on area’s
where the third boom section wear pads will slide.
3. Install retract chain, pin and clip to bottom front
inside of the second boom section.
Note: Keep the retract chain centered on bottom of the
third boom section while installing the third boom section
into the second boom section.
4. Using a suitable sling, balance the third and fourth
boom section and carefully slide 914mm-1219mm
(3 ft - 4 ft) into the front of the second boom section.
Set the third and fourth boom section onto a suitable
support and reset the sling under the boom head of
the fourth boom section. Carefully slide the third and
fourth boom section into the second boom section.
Leave 152mm-203mm (6 in - 8 in) of the third boom
section out to be able to install the wear pads in the
front of the second boom section
5. 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
second boom section. Torque to 90 Nm (66 lb-ft).
Lower the third and fourth boom section and apply
Loctite 242
® to the wear pad mounting bolts and
install bottom wear pads, backing plates, shims, and
the allenhead cap bolts in the front of the second
boom section. Torque to 90 Nm (66 lb-ft). Install both
left side and right side front wear pads, backing
plates, shims and bolts in the front of the second
boom section. Torque to 90 Nm (66 lb-ft).
Note: Grease wear pads, inside sheaves, bores and
pins during assembly.
6. Install both sheaves (2), pins, lock plates and bolts at
the bottom front of the second boom section. Apply
Loctite 242
® and torque bolts to 90 Nm (66 lb-ft).
Grease the sheaves using the grease fitting in the
pin. Spin the sheaves by hand to ensure the sheaves
spin freely on the pin and to distribute grease evenly.
Pull both extend chains from the third boom section
around the front and over the sheaves. Install both
chain clevises, pins and clips (3).
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 third boom section. Shim the
top left and right wear pads on the rear of the third
boom section.Torque bolts to 90 Nm (66 lb-ft).
Torque grease fitting bolts to 45 Nm (33 lb-ft).
8. Install the retract chain sheave (4), pin, keeper and
bolts to bottom rear of third boom section. Apply
Loctite 242
® and torque to 90 Nm (66 lb-ft). Grease
the sheaves using the grease fitting in the pin. Spin
the sheaves by hand to ensure the sheaves spin
freely on the pin and to distribute grease evenly.
MZ1000
2
Second Boom Section
(front)
MZ1010
Retract Chain
Clevises
Third Boom Section
(rear)
3
4