Manual

General Maintenance
171
Model 10054 Rev 3/02
Turning or Protruding Pins (Figure 122)
Highly loaded chain, operating with inadequate lubrication can generate
abnormal frictional forces between pin and link plates. When chain is
allowed to operate in this condition, a pin or series of pins, can begin to
twist out of a chain, resulting in failure.
Examine the pin head rivets to determine if the “VEE” flats are still in
correct alignment. Chain with rotated/displaced heads or abnormal pin
protrusion should be replaced immediately.
DO NOT attempt to repair the chain by welding or driving the pin(s)
back into the chain. Once the press fit integrity between outside plates
and pins has been altered, it cannot be restored.
Any wear pattern on the pin heads or the sides of the link plates
indicates misalignment in the system. This condition damages the chain
as well as increases frictional loading and should be corrected.
Figure 122
Distorted or Battered Link Plates
Distorted or battered link plates (Figure 123) on a leaf chain can cause
tight joints and prevent flexing.
Figure 123
MM2060
VEE Flats Correct
Alignment
Rotated Heads
Abnormal Pin
Protrusion
MA9340
Distorted or Battered
Link Plates
General Maintenance
171
Model 10054 Rev 3/02
Turning or Protruding Pins (Figure 122)
Highly loaded chain, operating with inadequate lubrication can generate
abnormal frictional forces between pin and link plates. When chain is
allowed to operate in this condition, a pin or series of pins, can begin to
twist out of a chain, resulting in failure.
Examine the pin head rivets to determine if the “VEE” flats are still in
correct alignment. Chain with rotated/displaced heads or abnormal pin
protrusion should be replaced immediately.
DO NOT attempt to repair the chain by welding or driving the pin(s)
back into the chain. Once the press fit integrity between outside plates
and pins has been altered, it cannot be restored.
Any wear pattern on the pin heads or the sides of the link plates
indicates misalignment in the system. This condition damages the chain
as well as increases frictional loading and should be corrected.
Figure 122
Distorted or Battered Link Plates
Distorted or battered link plates (Figure 123) on a leaf chain can cause
tight joints and prevent flexing.
Figure 123
MM2060
VEE Flats Correct
Alignment
Rotated Heads
Abnormal Pin
Protrusion
MA9340
Distorted or Battered
Link Plates