SkyTrak 10054 Operation Manual - Manual (Page 179)

General Maintenance
177 Model 10054 Rev. 11/03
Elongation
Double Extend Chains:
When the original length (3) of 12.00" (305 mm) per foot of new chain
has elongated from wear to a length (4) of 12.36" (313 mm), the chain
should be discarded and replaced.
Single Extend Chains:
When the original length (3) of 12.00" (305 mm) per foot of new chain
has elongated from wear to a length (4) of 12.36" (313 mm), the chain
should be discarded and replaced.
It is important to measure the chain in the section that moves over the
sheaves because it receives the most frequent articulation. Measuring
the chain near its clevis terminals could give an inaccurate reading. The
ends of the chains, near the clevis terminal, will not have flexed as
frequently, if at all, as nearer the middle of the chains.
Double Extend Chains: Measure across a span of 17 pins at the
center of the extend chain. Measure from pin center to pin center.
Because the retract chain is inside the boom you will not be able to
measure the chain.
Single Extend Chains: Measure across a span of 13 pins at the center
of the extend chain. Measure from pin center to pin center. Because the
retract chain is inside the boom you will not be able to measure the
chain.
All Chains: The maximum measurement allowed is 12.36" (313 mm). If
the measurement is more than 12.36" (313 mm), the chain should be
replaced.
MM2120
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