Lull 644E-42 Operation Manual - Manual (Page 159)

General Maintenance
157 Model 644E Origin 3/04
Turning or Protruding Pins
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 ìVEEî flats are still in correct
alignment (3). Chain with rotated/displaced heads (4) or abnormal pin
protrusion (5) 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. Contact your local Lull
Distributor or the JLG Service Department at (877) 554-5438 or (717) 485-6657
for specific instructions.
Distorted or Battered Link Plates
Distorted or battered link plates (6) on a leaf chain cause tight joints and prevent
flexing.
MM2060
3
5
4
MA9340
6