Lull 944E-42 Service Manual - Manual (Page 83)

3.35 Model 644E-42/944E-42 Rev. 6/04
Boom
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 the (N) NEUTRAL DETENT
position, engage the parking brake switch and raise
the boom to a horizontal (level) position.
3. Fully extend the boom, then retract it 2" (51 mm)
(one inch per section). Turn the engine OFF.
4. Measure the sag (11) in the top boom extend
chain (12) between the bottom of the chain and the
top of the intermediate boom (13) at their closest
point (11). Acceptable boom chain sag (11) is
between 3.00" (76 mm) and 4.00" (102 mm). If the
measurement is still less than 3.00" (76 mm), the
boom chain needs to be readjusted.
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.
OA0492
11
12
13