Big Joe J1-192, Maintenance Repair Parts Manual, Page: 48 / 124

7-2 BL-J1-192-0315 - 11-19-2019
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. On Tele-
cospic vehicles, Both chains should be replaced at the
same time. To make this determination proceed as fol-
lows.
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.
10. Engage the emergency power disconnect switch
and turn off key switch
7-4.1. Three Stage Mast
7-4.1.1.Mast Lifting Chain
1. With the vehicle wheels securely blocked, raise
the inner mast approximately three feet and posi-
tion 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, flat washer, clevis pin and
anchor connecting chain to inner mast.
5. Remove cotter pin, flat washer and clevis pin con-
necting 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, flat washer and cotter pin.
9. Connect the opposite end of chain to the inner
mast with anchor, clevis pin, washer and cotter
pin.
10. Adjust the chains according to paragraph 7-2.
11. Disengage the emergency power disconnect
switch and turn on key switch.
7-4.1.2.Platform Lifting Chain
1. With the vehicle wheels securely blocked, raise
the Platform approximately three feet and position
blocks or strong supports under Platform.
2. Lower Platform 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, flat washer, clevis pin and
anchor connecting chain to lift cylinder.
5. Remove cotter pin, flat washer and clevis pin con-
necting chain to adjusting screw at Platform.
6. Remove chain from sheave.
7. Position new chain on sheave.
8. Secure chain to Platform with adjusting screw,
clevis pin, flat washer and cotter pin.
9. Connect the opposite end of chain to the lift cylin-
der with anchor, clevis pin, washer and cotter pin.
10. Adjust the chains according to paragraph 7-2.
11. Disengage the emergency power disconnect
switch and turn on key switch.