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(2)
Chain wheel bearing support(TF mast)
Remove the platform and move to one side.
After removing bolt to securing chain wheel bearing support assembly to free lift cylinder.
After a sling to the chain wheel bearing support assembly, using an overhead hoist, lift support
assembly straight up and off of free lift cylinder. Move assembly to work area.
Remove retaining ring securing chain wheel bearing to chain wheel bearing support.
Remove bearing retaining ring from chain wheel bearing and press bearings from chain wheel
bearings.
Thoroughly clean, inspect and replace all worn or damaged parts.
Reverse the above procedure to install.
(3)
Rear chain(TF mast)
Remove the platform and move to one side. Refer to platform removal and installation.
Raise and securely block truck approximately 6 inches from the floor.
Using a sling or chain around inner mast section attached to an overhead hoist, slowly raise inner
mast until there is enough slack in the chains to remove them. Block inner mast section.
Remove split pins and chain anchor pins securing chains to chain anchor(part of inner mast).
While supporting the chains, remove split and chain anchor pins securing chains to chain
anchors attached to outer mast section.
Remove chains.
Reverse the above to assemble and install. Use new split pins in chain anchor pins. Refer to this
section for load chain lubrication and adjustment.
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4)
Lift chain
Place a sling around platform and attach to an overhead hoist. Lift and secure high enough
platform so that split and chain anchor pins on carriage can be easily be removed. Remove
chain anchor pins from platform and drape chains out over carriage.
Place a wooden block under the platform and lower the platform on the block.
While supporting the chains, remove split pins and chain anchor pins from chain anchors.
Remove chains and wash them with solvent. Refer to this section for load chain inspection and
maintenance.
Reverse the above procedure to assemble and install. Use new split pins in chain anchor pins.
Refer to this section for load chain lubrication and adjustment.
(5)
Load chain inspection and maintenance
After every 200 hours of truck operation, lift chains should be inspected and lubricated inspect for
the following chain conditions :
Wear
As the chain flexes on and off the chain wheel bearings, the joints very gradually wear. The
stretch a chain developes in service is due to material being worn off pin outer diameter and pitch
hole inner diameter on the inside plate.
Chain wear can be measured using a wear scale or steel tape. When chains have elongated
2%, they should be discarded. When checking chain wear, be sure to measure a segment of
chain that operates over a sheave. Do not repair chains by cutting of the worn section and
splicing in a new piece. If part of the chain is worn, replace all the chains on the truck.
8-12
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