Elevation System Servicing; Lift Chain Length Adjustment; Chain Assembly; General - Big Joe Joey J1 Series Maintenance And Repair Parts Manual

7-1. GENERAL.

The elevation system includes the outer mast, inner
mast, lift linkage, drag chains, lift chains, lift cylinder
and ram head.

7-2. LIFT CHAIN LENGTH ADJUSTMENT.

1. Fully lower the Platform (11,
2. Engage the emergency power disconnect switch
(6, Figure 11-8) and turn off key switch (3).
WARNING: Before attempting any adjustment, make
certain power is disconnected.
3. Loosen jam nut (2,
ment of middle jam nut.
4. Break the lower jam nut (2) free from the middle
jam nut (2).
5. Take up slack in the lift chain with middle jam nut
(2).
6. Align anchor (1) so the clevis pin (4) is parallel to
the mast.
CAUTION: At least 3 full threads must be present
below lower nut (2) after adjustment.
7. Tighten jam nuts securely while maintaining align-
ment of clevis pin (4).
8. Disengage the emergency power disconnect
switch (6, Figure 11-8) and turn on key switch (3).
9. Test chain by operating Platform (11,
If slack is still apparent, repeat above procedure.
BL-J1-0315 - 11-19-2019

ELEVATION SYSTEM SERVICING

Figure 7-5).
Figure 7-1) to allow for adjust-
Figure
SECTION 7
7-5).
R7026
Figure 7-1 Chain Assembly
7-1