TM 5-3805-262-34
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Connect multimeter leads to double check valve and stop light switch ter-
minal studs. Check that multimeter indicates an open circuit (infinity).
Disconnect multimeter leads. If multimeter does not indicate an open cir-
cuit, disassemble unit and check piston and spring.
Install 1/4 and 3/8 NPT pipe plugs in double check valve and stop light
switch outlet ports.
Install 1/2 to 1/4
switch inlet port.
Connect multimeter
minal studs.
NPT reducer on double check
Connect air compressor hose
leads to double check valve
valve and stop
to reducer.
and stop light
light
switch ter-
Apply 10 psi compressed air to inlet port of double check valve and stop
light switch. Multimeter shall indicate continuity (zero ohm). If multi-
meter does not indicate continuity, disassemble unit and check diaphragm
and piston.
Disconnect compressed air source from inlet port of double check valve
and stop light switch. Multimeter shall indicate an open circuit (infini-
ty). If multimeter does not indicate an open circuit, disassemble unit
and check spring and piston; piston may be sticking in its bore.
Disconnect multimeter and air compressor hose. Loosen and remove pipe
plugs installed in double check valve and stop light switch ports.
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