SkyTrak 8042 Service Manual - Manual (Page 195)

Boom
3.134 Model 8042, 10042, 10054 Legacy Rev. 03/04
3.7.2 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 the 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 vehicles working consistently in
extreme hot or cold conditions requires special
consideration. It is important that a reputable lubrication
specialist, consult the local Sky Trak distributor or the JLG
Service Department at 1-877-554-5438 or
1-717-485-6657, for guidance.
3.7.3 Boom Chain Tension Check
1. Make sure the carriage is attached to the gooseneck
before doing the tension check.
2. Start the engine. If necessary, attach carriage to
gooseneck. Park the vehicle on level ground. Place
the travel select lever in (N) NEUTRAL, place the
neutral lock lever in the (N) NEUTRAL LOCK
position, engage the parking brake switch and raise
the boom to a horizontal (level) position.
3. Lower both outriggers completely
4. Slowly, fully extend the boom and retract it about
halfway. Fully extend the boom again, then retract it
2" (51 mm) (one inch per section). Turn the
engine OFF.
5. Measure the sag in each of the three boom extend
chains (1) between the bottom of the extend chains
and the top of the boom at their closest point (2).
Acceptable boom chain sag (3) is between 1.5" (38
mm) and 2.5" (64 mm).
If the measurement is either less than, or greater
than the range given, the boom chains need to
be adjusted. Continue with Section 3.7.4, “Inter-
mediate Boom Chains Tension Adjustment,” or
to adjust the chain system.
6. Start the engine, retract the boom completely and
turn the engine OFF.
3.7.4 Intermediate Boom Chains Tension
Adjustment
Note: Always perform Section 3.7.3, “Boom Chain
Tension Check,” before adjusting the boom extend chain
tension.
1. Adjust the two intermediate boom extend chains (4).
If the chain sag measurement (3) is less than
1.5" (38 mm), tighten the two extend chain
adjustment locknuts (6).
If the chain sag measurement (3) is more than
2.5" (64 mm), loosen the two extend chain
adjustment locknuts (6).
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