Lull 944E-42 Service Manual - Manual (Page 47)

3-17 944E-42
Boom
3.4.3 Expose Chains for Inspection
b. Extend Chains
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 and shut the engine OFF.
The extend chains 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, 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.
c. Retract Chains
The retract 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 retract chain as the boom
is slowly extended. The retract chain must be removed
from the boom in order to be fully inspected. This must be
done every 1000 hours or whenever the retract chain is
removed from the boom. If there is ANY question that one
or all the retract chains are damaged, the boom should be
removed and disassembled with the retract chains being
inspected and replaced if necessary.
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.
3.4.4 Chain Lubrication
After inspection and before being returned to service,
chains must be lubricated with a quality chain lubricant
(“LUBRIPLATE” Chain & Cable Fluid, “LPS3” or
equivalent).
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.
Lubrication of chains on machines working consistently
in extreme hot or cold conditions requires special
consideration. It is important that a reputable lubrication
specialist or an authorized distributor be consulted for
guidance.
3.4.5 Boom Chain Tension Check
1. Make sure the attachment is attached to the boom
head before doing the tension check.
2. Park the machine on level ground. Place the
transmission control lever in (N) NEUTRAL, engage
the parking brake switch and level the boom.
3. Slowly, fully extend the boom and retract it about
halfway. Fully extend the boom, then retract it
2 in (51 mm) (one inch per section). Turn the
engine OFF.