Lift System Servicing; Lift Chain Wear Inspection; Lift Chains Replacement; Lift Chains Adjustment - Big Joe M22 Installation, Operation, Maintenance & Repair Parts

5-1. GENERAL

This section covers maintenance and repair proce-
dures for the lift system. The lift system consists of:
Inner mast assembly
Lift carriage

Lift forks

Lift chain
The lift cylinder is considered part of the hydraulic sys-
tem and is covered in SECTION

5-2. LIFT CHAIN WEAR INSPECTION.

Both lift chains should be replaced when either chain
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 a damaged chain. Refer to
paragraph 5-4. when installing new chain.

5-3. LIFT CHAINS ADJUSTMENT.

1. Lower the carriage fully, then disconnect battery.
CAUTION: At least 3 full threads must be present
below bottom hex nut after completion of
adjustment.
2. Loosen the top jam nuts on the adjusting bolts.
BL-M22EP-0119 - 01-11-2019
SECTION 5

LIFT SYSTEM SERVICING

6.
WARNING: Before attempting any adjustment, make
certain power is disconnected.
3. Take up slack in both chains by turning the bottom
nuts on adjusting bolts. Try to get equal tension
on both chains.
4. Align adjusting bolts so that they are parallel to
the mast.
5. Tighten the jam nuts while maintaining alignment
of the adjusting bolts.

5-4. LIFT CHAINS REPLACEMENT.

1. Place a solid support on the floor under the verti-
cal members nearest the center of the lift car-
riage.
2. Lower the carriage until it is supported by the sup-
port and the chains are slack, then disconnect
battery.
WARNING: Before attempting any adjustment, make
certain power is disconnected.
3. Remove cotter pin and clevis pin that secure
chain to the lift carriage.
4. Remove cotter pin and clevis pin that secure
chain to adjusting bolt.
5. Remove the chain from sheave.
6. Position new chain in place on sheave.
7. Connect chain to adjusting bolt with clevis pin and
cotter pin.
8. Connect the opposite end of chain to the lift car-
riage with clevis pin and cotter pin.
9. Replace the remaining chain is the same manner.
10. Adjust chains according to paragraph 5-3.
5-1