TM 5-5420-280-23&P
0004 00
INTRODUCTION TO TROUBLESHOOTING (Contd)
j. Description of Limit Switches Operation
KA1 During launch, stops lower bridge half when deploying toward rear of pallet, and during retrieval,
stops lower bridge half.
KA2 During launch, switches forward pin wheel drive to rear pin wheel drive, and during retrieval,
switches rear pin wheel drive to forward pin wheel drive.
KA3 During retrieval, stops lower bridge half at precoupling position before raising secondary boom,
and during retrieval, stops bridge half before lowering secondary boom.
KA4 During launch, stops lower bridge at coupling position. During retrieval, KA4 and KA3 work
together to stop bridge, activate launch boom to raise bridge half to prestress upper coupling,
which is then stopped by potentiometer, and stop bridge when driven toward pallet A-frame.
KA5 During launch and retrieval, stops upper bridge half in up position, and stops winch when lifting
upper bridge half to up position.
KA6 During launch, stops secondary boom and when secondary boom is fully lowered it activates
launch boom to go up. During retrieval, stops secondary boom when raised, and activates launch
boom to lower.
NOTE
Limit switch KA7 is no longer used and has been removed.
KA8 During retrieval, stops bridge at base of A-frame when driving (retracting), activates winch, then
stops winch.
KA3
KA4
KA6
0004 00-10
