TM 5-5420-280-23&P
0002 00
EQUIPMENT DESCRIPTION (Contd)
PALLET EQUIPMENT FEATURES (Contd)
BF
LIMIT SWITCHES There are seven electrical switches positioned on pallet frame that stop travel
of components at set positions by activating control valve solenoids, thereby making launch and
retrieval functions automatic. A functional description of each limit switch is listed below.
NOTE
Limit switch number KA7 is no longer used.
KA1 -
During launch, stops lower bridge half when deploying toward rear of pallet, and during retieval,
stops lower bridge half.
KA2 -
During launch, switches forward pin wheel drive to rear pin wheel drive, and during retrieval,
swithches rear pin wheel drive to forward pin wheel drive.
KA3 -
During launch. Stops lower bridge half at pre-coupling position before raising secondary boom, and
during retrieval, stops bridge half before lowering secondary boom.
KA4 -
During launch, stops lower bridge half at coupling position. During retrieval, KA4 and KA3 work
together to stop bridge, activate launch boom to raise bridge half to pre-stress 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.
KA8 -
During retrieval, stops bridge at base of A-frame when driving (retracting), activates winch, then
stops winch.
BF
KA4
KA3
KA6
0002 00-22
