7-3. LIFT CHAIN WEAR INSPECTION.
The lift chain should be replaced when it is worn
enough to increase it’s length by 3% or more.
To make this determination proceed as follows.
Using a section of chain that sees the most frequent
operation over the chain sheaves, isolate a vertical
portion under tension from the weight of carriage and
forks.
Measure the distance between pin centers on 20 verti-
cal links. If the section measures 12.88” or more, the
chain should be replaced.
New chain anchor pins should be installed when
chains are replaced. Never replace a partial section of
chain and never repair chain. Refer to paragraph 7-4.
when installing new chain.
7-4. LIFT CHAIN REPLACEMENT.
7-4.1. Three Stage Mast
7-4.1.1.Mast Lifting Chain
1. With the vehicle wheels securely blocked, raise
the inner mast (Figure 7-3) approximately three
feet and position blocks or strong supports under
the inner mast.
2. Lower inner mast onto the support. Check that
arrangement is secure before proceeding.
3. Engage the emergency power disconnect switch
and turn off key switch.
WARNING: Before attempting any replacement,
make certain power is disconnected.
4. Remove cotter pin, clevis pin and anchor
connecting chain to inner mast.
5. Remove cotter pin and clevis pin connecting
chain to adjusting screw at the outer mast.
6. Remove
chain from sheave.
7. Position new chain on sheave.
8. Secure chain to outer mast with adjusting screw
clevis pin and cotter pin.
9. Connect the opposite end of chain to the inner
mast with anchor, clevis pin and cotter pin.
10. Adjust the chains according to paragraph 7-2.
11. Disengage the emergency power disconnect
switch and turn on key switch.
7-5. LIFT CYLINDERS.
NOTE: Removal and repair of lift cylinders are
covered in SECTION 8.
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