263920 R
2
Page 4
4
S
ervice
5.6
Chains
5.6-1
Lubrication, Adjustments
and Wear
Regular lubrication and adjustment of the chains will
increase their service life and reduce Mast downtime. The
chains should be covered with a thin film of lubricant at all
times. If the chains are dry, lubricate the full length of the
chains with SAE 40 wt. oil or Bowman Heavy Load Red
Grease.
The chains should be adjusted for: 1) correct upright and
carriage position and 2) equal tension to ensure proper
load distribution and mast operation (Refer to Section 2.3,
Mast Inspection
). If the uprights or carriage are not on
the proper position, or if chain tension is not equal, adjust
the chains as described in Sections 5.6-3 and 5.6-4.
The chains should be free of any of the damage shown (see
Figure 48). If inspection reveals that one strand of a pair of
chains requires replacement,
both
strands of the pair
should be replaced.
* Check for rust.
* Check for cracked side plates. If damage is found
replace both strands of the chain.
* Check for tight joints. If tight joints are caused by rust or
corrosion, loosen them with SAE 40 wt. oil or penetrating
oil. If they cannot be loosened, or if the tight joints are
caused by bent pins or plates or by peened plate edges,
replace both strands of the chain pair.
* Check for protruding or turn pins. If damage is found,
replace both strands of the chain pair.
* Check for chain side wear. If pins and outside plates
show signs of wear, check for misalignment of sheaves,
anchors or other components. Correct the misalignment.
If wear is excessive, replace both strands of the chain pair.
* Check for worn, broken or misaligned chain anchors.
Replace or adjust as required.
Figure 48. Damage requiring chain replace-
ment.
