TM 9-2350-256-34
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1.
Connect pressure switch assembly (1) to porta-power pump (2) and pressure gage (3) and connect ohmmeter (4) to two
electrical leads on pressure switch assembly as shown below:
NOTE
Ohmmeter must read "0" ohms with no hydraulic pressure applied. If ohmmeter does not read "0,"
replace the pressure switch assembly and perform the test and adjustment procedure on a new pressure
switch assembly.
Actuate pump and slowly raise pressure to 235 3 psi (1620 21 kPa) while watching ohmmeter. The pressure switch
2.
assembly should open (ohmmeter reads infinity) at this pressure. If it does not or if it opens before this pressure is reached,
adjust the pressure switch assembly as instructed in the ADJUSTMENT procedure below.
Slowly relieve pressure until pressure switch assembly closes (ohmmeter reads "0"). The pressure gage should read 221
3.
8 psi (1524 55 kPa) at this point. If it does not, replace pressure switch assembly and perform this TESTING procedure
and the ADJUSTMENT procedure below on the new pressure switch assembly.
Again raise the pressure slowly to 235 3 psi (1620 21 kPa) to check repeatability of the pressure switch assembly. It
4.
should open again at this pressure. If it does not, replace the pressure switch assembly and perform this TESTING procedure
and the ADJUSTMENT procedure below on the new pressure switch assembly.
Relieve pressure and disconnect test equipment.
5.
Installation
1.
Install pressure switch assembly in accordance with TM 9-2350-256-20.
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