JLG 4017RS Service Manual - Manual (Page 77)

3-37 3614RS, 4017RS
Boom
3.15.5 Chain Lubrication
After inspection and before being returned to service,
chains must be lubricated with Multipurpose Grease-NLGI
Grade 2.
The lubricant must penetrate the chain joint to prevent
wear. Applying lubricant to the external surfaces will
prevent rust, but the chains should be articulated to make
sure the lubricant penetrates to the working surfaces
between the pins and links.
To prepare the chain for lubrication, the chain plates should
be brushed with a stiff brush or wire brush to clear the space
between the plates so that lubricant can penetrate to the
working surfaces.
Lubricant may be applied with a narrow paint brush or
directly poured on, but the chain should be well flooded
with lubricant and the boom should be extended and
retracted to be sure that the lubricant penetrates to the
working surfaces. All surplus lubricant should be wiped
away from the external surfaces. DO NOT use a solvent for
this wiping operation.
Regular application of lubricant is necessary to make sure
that all working surfaces are adequately lubricated. In
extremely dusty conditions, it may be necessary to lubricate
the chains more often. Refer to Section 2.6, “Service and
Maintenance Schedules,” and Section 2.7, “Lubrication
Schedule,” for detailed information.
Lubrication of chains on vehicles working consistently in
extreme hot or cold conditions requires special
consideration. Contact the JLG dealer for guidance.
3.16 BOOM WEAR PADS
The boom wear pads are flat rectangular plastic blocks with
metal inserts.
3.16.1 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.
3.16.2 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 ® 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 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
M 7680 Z
1
1
MAM1390
2
3
4