JLG G12-55A AccuPlace Service Manual - Manual (Page 39)

3.17 G10-55A & G12-55A AccuPlace
Boom
3.7 BOOM WEAR PADS
The wear pads on this machine are flat rectangular wear
pads with metal inserts.
A total of 42 wear pads are installed on the boom.
3.7.1 Wear Pad Inspection
Inspect all wear pads for wear. If the angle indicators (3)
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.
Wear pad bolt torques are:
3/8 in. bolt: 32-37 lb-ft (43-50 Nm)
1/2 in. bolt: 76-86 lb-ft (103-117 Nm)
Hollow 3/8 in. bolt: 15-17 lb-ft (20-23 Nm)
Hollow 1/2 in. bolt: 45-50 lb-ft (61-68 Nm)
Note: The first shim next to a wear pad always needs to
have the two hole configuration. The remaining pads (4)
may have the large slot configuration.
Use shims under the wear pads as required to maintain a
maximum gap of 1/16 in (1,6 mm) (5) between the wear
pad on the front and sides of the boom. The gap at the
rear of the boom should be no more than 3 mm (0.12”).
Shims are available in a 0.06 in (1,5 mm) thickness.
3.7.3 Boom Wear Pad 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, 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.
Ma2070
3 3
MY0630
4
5