JLG 4017 Service Manual - Manual (Page 45)

3.21 4017
Boom
3.7 BOOM WEAR PADS
There are a total of 50 wear pads installed on the first,
second, third and fourth boom sections. 10 wear pads are
attached to the first boom section, 16 to the second boom
section, 16 to the third boom section and 8 to the fourth
boom section.
Note: All shims are used to maintain a minimum gap
between the wear pad and the boom surface.
3.7.1 Wear Pad Inspection
Inspect all wear pads for wear. If the angle indicators on
the ends of the wear pads are visible, the wear pads can
be reused. If the pads show uneven wear (front to back),
they should be replaced. Replace pads as a set if worn or
damaged.
3.7.2 Boom Wear Pad Replacement
When replacing a wear pad on the boom, replace both
wear pads on that side of the boom; e.g.: replace top front
left and top front right wear pads at the same time.
Usually, shimming will remain the same when installing
new wear pads. Some wear pads are secured to the
boom using different bolts and washers. Keep bolts and
washers with the same wear pad that is being replaced.
When installing new wear pads, apply Loctite
® #242 to all
wear pad mounting bolts and torque to required
specifications.
a. Fourth Section Boom
Coat all wear pad bolts with Loctite 242 ® before
installation.
All fourth section boom wear pads are mounted on the
rear outside of the fourth section boom.
Use shims under the upper rear wear pads and under the
side wear pads as required to maintain a minimum gap of
1.6 mm (1/16 in) between the wear pad and the boom
surface. Shims are available in two thicknesses, 2.0 mm
and 4.0 mm.
b. Third Section Boom
Coat all wear pad bolts with Loctite 242 ® before
installation.
The wear pads on the inside front and outside rear of the
third boom section can be replaced by removing the bolts
securing them to the top, sides and bottom of the boom.
When removing pads, move the boom sections as
needed to gain access for removal and installation of
wear pads. Mark or otherwise label each pad, spacer/
shim and hardware set for ease of installation later. Top
wear pads are secured to the boom with washers and
bolts; side wear pads are secured with washers and
bolts.
Ma2070
MZ0840
Fourth Section Boom