Elevation System Servicing; General; Lift Chain Length Adjustment - Big Joe PDSR 30 Installation, Operation, Maintenance & Repair Parts

8-1. GENERAL

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

8-2. LIFT CHAIN LENGTH ADJUSTMENT

NOTE: The T elescopic trucks have two lift chains that
are adjusted at the cross member of the outer
mast. TRIMAST trucks have
The free lift chains are adjusted at the free
lift cylinder close to the cross member of the
inner mast. The secondary lift chains are
adjusted at the top of the outer mast.
1. Fully lower the lift carriage.
2. Engage the emergency stop switch and turn off
key switch.
WARNING: Before attempting any adjustment, make
certain power is disconnected.
3. Loosen both upper jam nuts to allow for adjust-
ment of middle jam nuts.
4. Break both lower jam nuts free from the middle jam
nuts.
5. Take up slack in both lift chains with middle jam
nuts. Strive for equal tension on both chains.
6. Align anchor so the clevis pins is parallel to the
masts.
CAUTION: At least 3 full threads must be pres-
ent below lower nut after adjustment.
7. Tighten jam nuts securely while maintaining
alignment of clevis pins.
8. Disengage the emergency stop switch and turn on
key switch.
9. Test chain by operating carriage. If slack is still
apparent, repeat above procedure.
BL-PDSR 30-0319 - 03-07-2019
SECTION 8

ELEVATION SYSTEM SERVICING

four lift chains.
DR_0027
Figure 8-1 Chain Assembly
8-1