JLG 4017 Service Manual - Manual (Page 34)

Boom
3.10 4017
9. Install both retract chain sheaves (1), pin, keeper
and bolts to bottom rear of second 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.
3.3.9 Second, Third & Fourth Boom Section
Installation
IMPORTANT: 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 ® 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
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).
2. Grease the inside first boom section on area’s where
the second boom section wear pads will slide.
3. Install the retract chains (2), pins and clips to bottom
front inside of the first boom section.
4. Install both tilt hoses (3) and both auxiliary hoses (4)
to the tubes mounted at the bottom front of the first
boom section. Make sure both sets of hoses are run
through the opening at the bottom front of the first
boom section and run down the inside center of the
boom section
Note: Keep the retract chains, tilt and auxiliary hoses
centered in the first boom section while installing the
second boom section into the first boom section.
MZ1140
Second Boom Section
(rear)
1
MZ1190
2
3 4
First Boom Section
(front view)