Skytrak 6042 Service Manual User Manual download pdf (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.

OA0492

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Skytrak 6042 Service Manual User Manual Page 100

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