TM 10-3930-675-24-2
SPREADER CHAIN REPLACEMENT - CONTINUED
0168 00
CHAIN TENSION MEASUREMENT
1.
Open tophandler spreader to 40-ft position and observe spreader has bottomed out on stop blocks. Measurement is to be
made at third access hole closest to middle of tophandler.
2.
Place tape measure against back wall of tophandler middle section perpendicular to chain.
3.
Apply force of approximately 50 to 60 lb (250 N) against chain (19).
4.
Measure deflection of chain. Deflection should be a minimum of 3/4 in. (20 mm) to a maximum of 1-1/2 in. (40 mm).
5.
Measure tension of both chains.
CHAIN TENSION ADJUSTMENT
NOTE
Both chains must be equally adjusted during adjustment procedure.
DO NOT adjust more than 1 turn (1/8 in. (2 mm)) of the adjustment nut at a time without
rechecking chain tension. Operating tophandler spreader with excessive tension on chain may
result in damage to equipment.
1.
If chains (19) require adjustment, operate tophandler spreader towards 20-ft position, stopping to allow access to chain
adjuster.
2.
Loosen jamnut. Loosen or tighten locking nut to decrease or increase tension.
3.
Reposition tophandler spreader and recheck tension measurement. Adjust as needed.
4.
Tighten jamnut when correct tension is obtained.
LOCKING NUT
19
JAMNUT
434-40191
434-40144
0168 00-11
