TM 9-3990-260-14&P
3-2.
M3 CROP TROUBLESHOOTING SYMPTOMS (CONT).
MALFUNCTION
TEST OR INSPECTIONS
CORRECTIVE ACTION
1.
END STRUCTURE ASSEMBLY (A-FRAME) LOWERS TOO RAPIDLY (TOO HEAVY).
End structure assembly dead weight is beyond two-man lift limit. The end structure
assembly is equipped with a rear pin and castle nut which secures the end structure
and serves as a friction device which aids in lowering the end structure assembly.
Lowering operations must by conducted on level ground.
Do not stand under end structure assembly when raising or lowering.
Use an assistant when raising or lowering the end structure assembly to prevent seri-
ous injury to personnel.
Is one or both rear pins loose or missing the castle nut or cotter pin?
If the rear pin assembly is loose, tighten each rear pin by inserting the BII pin tight-
ening rod through the hole in the end of each pin and turning the castle nut clock-
wise using the BII 2 " socket and socket wrench. Tighten the castle nut until it
presses firmly against the lock washer and the split in the lock washer is fully com-
pressed. Turn the castle nut a further 1/4 to 3/4 turn. Do not bend the tightening rod
by attempting to turn the rear pins using the tightening rod. Use the 2 " socket and
socket wrench to turn the castle nut. The tightening rod is used to keep the rear pin
from turning during the tightening procedure.
If the castle nut or cotter pin is missing, contact unit maintenance.
