Skytrak 6036 Service Manual Bedienungsanleitung PDF herunterladen (Seite 84)

Boom

3.44

Model 6036 Legacy

3.3.7 Boom Chains

This vehicle uses double extend chains to extend the

boom and a single retract chain to retract the boom. The

extend and retract chains are constructed of 3/4" pitch

links with 6 x 6 leaf lacing.

Note: DO NOT attempt to service or repair a chain.

Replace a stretched or damaged chain with a new one.

Replacement chains are shipped pre-assembled with

new clevis’.

a. Boom Chain Inspection

Figure 3-95 Every 250 Hours of Engine Operation,

Inspect Boom Chain Condition

Under normal operating conditions the boom chains will

need to be inspected every 250 hours of operation.

Environmental conditions and dynamic impulse/shock

loads can drastically affect normal operating conditions.

Environments in which material handling vehicles

operate can vary widely from outdoor moisture to mildly

corrosive or highly corrosive industrial atmospheres, in

addition to abrasive exposures such as sand and grit.

• Moisture - Corrosive rusting reduces chain

strength by pitting and cracking.

• Temperature - Low temperature reduces chain

strength by making the metal brittle. Going in and

out of cold storage results in moisture from

condensation.

• Chemical Solutions or Vapors - Corrosive attack

on the chain components and/or the mechanical

connections between the chain components.

Cracking can be (and often is) microscopic.

Going from microscopic cracking to complete

failure can be either abrupt or may require an

extended period of time.

• Abrasives - Accelerated wearing and scoring of

the articulating members of the chain (pins and

plates), with a corresponding reduction in chain

strength. Due to the inaccessibility of the bearing

surfaces (pin surfaces and plate apertures), wear

and scoring are not readily noticeable to the

naked eye.

Dynamic shock loading can impose abnormal loads

above the endurance limit of a leaf chain.

• High velocity movement of load, followed by

sudden, abrupt stops.

• Carrying loads in suspension over irregular

surfaces such as railroad tracks, potholes and

rough terrain.

• Attempting to “inch” loads which are beyond the

rated capacity of the vehicle.

Environmental conditions and load cycles make it

impossible to predict chain life. Each specific application

should be evaluated, based on the degree of exposure,

the areas of possible operation and the types of load

cycles.

A chain replacement schedule should be established to

prevent chain failure. This schedule can be established

by frequent inspection. Based on the observations, the

frequency of inspection can be changed.

This inspection procedure development should go on until a

projected time of replacement can be predicted. A chain

by its very nature and exposure should be considered an

expendable item and a safe chain replacement schedule

should be established.

The boom chain’s normal life expectancy can be expressed

as a maximum percent of elongation. This is generally

3% of pitch. As the chain flexes back and forth over the

sheave, the bearing joints (pins and inside link plates)

gradually incur wear due to articulation.

Inspection Guidelines

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.

WARNING: Worn pins, stretched or

cracked links or corrosive environments can

cause chain failure. A chain failure could result

in uncontrolled boom movement, loss of load

or vehicle instability, and could cause death or

serious injury and/or property damage.

MM2130

250

MS21702

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