JLG 4017PS Service Manual - Manual (Page 66)

Boom
3-28 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
4. Using a suitable sling, balance the third and fourth
boom sections and carefully slide 914 mm-1219 mm
(3 ft - 4 ft) into the front of the second boom section.
Set the third and fourth boom sections onto a
suitable support and reset the sling under the boom
head of the fourth boom section. Carefully slide the
third and fourth boom sections into the second boom
section. Leave 152 mm-203 mm (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 TM 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 TM to the wear pad mounting bolts and
install bottom wear pads, backing plates, shims, and
the allen head 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 (8), pins, lock plates and bolts at
the bottom front of the second boom section. Apply
Loctite
® 242 TM 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 (9).
7. Apply Loctite ® 242 TM 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 (1), pin, keeper and
bolts to bottom rear of third boom section. Apply
Loctite
® 242 TM 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.
9. Install both retract chain sheaves (2), pin, keeper
and bolts to bottom rear of second boom section.
Apply Loctite
® 242 TM 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.
3.13.9 Second, Third and Fourth Boom
Section Installation
Note: Light lubrication of the boom wear surfaces with a
factory authorized grease is recommended to keep the
boom wear surfaces lubricated properly. Light lubrication
of the boom wear surfaces is also recommended when
the machine is stored, to help prevent rusting.
1. Apply Loctite ® 242 TM to the wear pad mounting bolts.
At the rear of the second boom section, 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
MZ5750
8 9
MZ5760
1
MZ5770
2 2