JLG 723A Service Manual - Manual (Page 38)

Boom
3-8 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
3.5 BOOM WEAR PADS
A total of 14 wear pads are installed on the boom.
Twelve of the fourteen wear pads on this boom are flat
rectangular wear pads with metal inserts. Two wear pads
on the bottom of the second section boom are channeled
for tilt hose and auxiliary hose clearance.
3.5.1 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.
3.5.2 Wear Pad Installation and Lubrication
Note: Inspect all wear pads. Replace as necessary.
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 from any grease, oil or other contaminates
before applying Loctite
® 243 TM and installing mounting
bolts.
• Apply Loctite ® 243 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 be 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 (5) of
1,78 - 3,30 mm (0.070 - 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
7,92 mm (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 6,98 ± 1,0 mm (0.275 ± 0.040 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:
M10x20 Bolt, 50 Nm (37 lb-ft)
M10x25 Bolt, 50 Nm (37 lb-ft)
M10x30 Bolt, 50 Nm (37 lb-ft)
M10x40 Bolt, 50 Nm (37 lb-ft)
M10x45 Bolt, 50 Nm (37 lb-ft)
M10x50 Bolt, 50 Nm (37 lb-ft)
M12x20 Bolt, 90 Nm (66 lb-ft)
M12x25 Bolt, 90 Nm (66 lb-ft)
M12x30 Bolt, 90 Nm (66 lb-ft)
• Torque wear pad bolts after shimming is completed.
• Lubricate the face and pockets of each wear pad
after being installed.
Ma2070
1 1
4
3
2
5
MY3620
A
B