TM 5-5420-280-23&P
0056 00
LIMIT SWITCHES MAINTENANCE (Contd)
ADJUSTMENT
NOTE
All limit switch arm levers on KA1 through KA4 are spring loaded
and are not adjustable. Only the position of the lever and setting
of the limit of travel on each limit switch may change.
Limit switches KA1 through KA4 are mounted down the center of
the pallet and are spring lever type limit switches. These levers
are not adjustable and are fixed in the straight up position.
1.
KA1 Limit switch (2)
Adjust limit switch (2) so flexible rod (1) is in the straight up position when rod (1) contacts limit
switch bracket on underside of bridge launch beam as bridge half moves to rear during launch or
forward during retrieval.
NOTE
Limit switches KA2, KA3, and KA4 have cable gaurds mounted
next to switches to prevent winch wire rope cable from getting
caught under switches.
2.
KA2 Limit switch (2)
a. Adjust limit switch arm (2) so flexible rod (1) same contacts limit switch bracket on underside of
bridge launch beam as bridge half moves to rear during launch or forward during retrieval.
b. Limit switch KA2 switches operation of forward pin wheel drive to rear pin wheel drive during
launch, and switches rear pin wheel drive to forward pin wheel drive during retrieval.
NOTE
Perform step 3 if adjusting limit switches KA3 and KA4.
3.
Remove two screws (3) and cable guard bracket (4) from rear crossmember (5).
4.
KA3 Limit switch (2)
a. Adjust limit switch (2) so flexible rod (1) same contacts limit switch bracket on underside of
bridge launch beam as bridge half moves to rear during launch or forward during retrieval.
b. Limit switch KA3 stops lower bridge half at precoupling position before raising secondary boom
during launch, and stops bridge half before lowering secondary boom during retrieval.
NOTE
Ensure KA4 is angled forward and does not contact pin on bridge
launch beam.
5.
KA4 Limit switch (2)
a. Adjust limit switch (2) so flexible rod (1) same contacts limit switch bracket on underside of
bridge launch beam as bridge half moves to rear during launch or forward during retrieval.
b. Limit switch KA4 works together with limit switch KA3 during retrieval to stop bridge halves,
activate launch boom to raise bridge half to prestress upper coupling, where it is then stopped by
the potentiometer, and lastly, stops bridge when driven toward pallet A-frame.
6.
If removed, install cable guard bracket (4) or rear crossmember (5) with two screws (3).
0056 00-4
