Skytrak 6042 Service Manual User Manual download pdf (Page 95)

3.49

Model 6042 Legacy Origin 7/02

Boom

Other Modes of Failure

• Ultimate Strength Failure - These types of

failures are caused by overloads far in excess of

the design load. Either fractured plates

(Fig. 3-105, 6) or enlarged holes (7) can occur. If

either of these failures occurs, the chain must be

replaced immediately. (Refer to Section 3.4.5,

“Boom Extend and Retract Chains Removal and

Replacement.”)

Note: The tight joints inspection must be done with the

chain disconnected from the boom. (Refer to Section

3.4.5, “Boom Extend and Retract Chains Removal and

Replacement.”)

• Tight Joints - All joints in the chain must flex

freely. Tight joints (Fig. 3-105, 8) resist flexing

and increase internal friction, thus increasing

chain tension required to lift a given load.

Increased tension accelerates wear and fatigue

problems.

If the problem is caused by dirt or foreign

substance packed in the joints, clean and

lubricate thoroughly before re-installing the chain.

If the problem is caused by corrosion and rust or

bent pins, replace the chain. (Refer to Section

3.4.5, “Boom Extend and Retract Chains Remov-

al and Replacement.”)

Figure 3-105 Other Chain Failure Modes

b. Expose Extend Chain for Inspection

1. 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.

2. Fully extend the boom until the extend chain is taut.

Shut the engine OFF.

The extend chains will be visible for inspection with

the vehicle 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 clevis’

be replaced at the same

time.

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 the chains and

clevis’ be replaced at the same time.

3. If the chain needs to be replaced, refer to Section

3.4.5, “Boom Extend and Retract Chains Removal

and Replacement.”

4. If the chain does not need to be replaced, lubricate

the chain. (Refer to Section 3.4.2, “Chain

Lubrication.”)

MM2100

MM2110

MM2090

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Skytrak 6042 Service Manual User Manual Page 95

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