JLG 4017PS Service Manual - Manual (Page 76)

Boom
3-38 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
3.17 BOOM WEAR PADS
The boom wear pads are flat rectangular plastic blocks
with metal inserts.
3.17.1 Wear Pad Inspection
Inspect all wear pads for wear. If the angle indicators (1)
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.
3.17.2 Boom Wear Pad Installation/
Lubrication
The boom has been factory lubricated for proper wear pad
break-in and will normally require minor further
lubrication. However, after replacing any wear pad(s), or
after prolonged periods of inoperation, lubrication of the
boom wear surfaces with Multipurpose Grease is
recommended to keep the boom wear surfaces
lubricated properly. Lubrication of the boom wear
surfaces is also recommended when the machine is
stored, to help prevent rusting.
The following wear pad procedure must be followed to
insure the proper wear pad installation:
• The wear pad inserts and mounting bolts MUST be
clean before mounting bolts are installed.
• Apply Loctite ® 242 TM to all wear pad mounting bolts.
• A spacer (2) with holes must be used before any
shim (3) is used.
• A shim (3) must inserted between the spacer (2) and
wear pad support plate, block or boom section (4).
• The number of shims can vary at each shim point.
• The bottom wear pads must be shimmed equally on
each side.
• Maintain a total boom section clearance of 0.070 to
0.130 in both the horizontal and vertical directions.
• The length of the wear pad bolt depends on the
number of shims, spacers and washers being used.
• The thickness of each threaded wear pad insert is
0.312 in (A).
• The bolt length should be determined by measuring
the distance from the face of the insert to the face of
the boom (B) including any spacer, shim(s) and
washer(s).
• Bolt thread engagement in the wear pad insert
should be 0.275 ± 0.060 in.
• One or two hardened washers are to be used on
each wear pad bolt except where noted otherwise.
DO NOT use more than two hardened washers.
• Use only one hardened washer if mounting bolts are
recessed.
• Wear Pad Bolt Torque:
3/8 - 24 Bolt, 32 to 37 lb-ft.
3/8 - 24 Hollow Bolt, 15 to 17 lb-ft.
1/2 - 20 Bolt, 76 to 86 lb-ft.
1/2 - 20 Hollow Bolt, 45 to 50 lb-ft.
• Lubricate the face and pockets of each wear pad
after being installed.
Boom Section Wear Pad Pathway Lubrication:
• Clean and lightly grease all wear pad pathways with
Multipurpose Grease.
• Clean and lightly grease the hose carrier guide bar
pathway with Multipurpose Grease.
Ma2070
1 1
MAM1390
2
3
4
5
MY3620
A
B