JLG 4017PS Service Manual - Manual (Page 75)

3-37 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
3.16.4 Expose Chains for Inspection
c. Retract Chain
1. Park the machine on a firm, level surface. Place the
transmission control lever in (N) NEUTRAL, engage
the park brake switch and raise the boom to a
horizontal (level) position.
2. Fully extend the boom until the retract chain is taut.
Shut the engine OFF.
The retract chain will be visible for inspection with the
machine in this state.
While doing the chain inspection, check all chain clevis
ends for distortion or cracking and sheaves for bearing
wear or grooving from the chain.
If during the inspection, if any chain is found to be
damaged or stretched, the chain must be replaced. It is
recommended that when any chain is replaced, that all
the chains and clevises be replaced at the same time.
d. Extend Chains
The extend chains are only partially visible through the
rear of the boom with all the sections retracted. It is
possible to see a section of the extend chain as the boom
is slowly extended. If there is ANY question that one or
both extend chains are damaged, the extend chains
should be removed, inspected and replaced if necessary.
Refer to Section 3.16, “Boom Extend and Retract Chains
- 4014PS & 4017PS.”
Note: DO NOT attempt to repair a chain. Replace a
stretched or damaged chain with a new part. Always
replace both the chain and the clevis. It is recommended
that when any chain is replaced, that all chains and
clevis’ be replaced at the same time.
3.16.5 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.