SkyTrak 6042 Service Manual - Manual (Page 100)

Boom
3.54 Model 6042 Legacy Origin 7/02
3.4.2 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.
3.4.3 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. Slowly, fully extend the boom and retract it about
halfway. Fully extend the boom, then retract it 2"
(51 mm) (one inch per section). Turn the engine
OFF.
4. Measure the sag in the top boom extend chains
(Fig. 3-115, 1) between the bottom of the extend
chains and the top of the intermediate boom at their
closest point (2). Acceptable boom chain sag (3) is
between 1-1/2" (38 mm) and 2-1/2" (64 mm).
Figure 3-115 Extend Chain Sag
If the measurement is either less than, or greater
than the range given, the boom chains need to
be adjusted. Continue with Section 3.4.4, “Boom
Chain Tension Adjustment” to adjust the chain
system.
5. Start the engine, retract the boom completely and
turn the engine OFF.
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