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Topic: Auxiliary Pump Relay or Pressure Switch? (Read 386 times) previous topic - next topic

Auxiliary Pump Relay or Pressure Switch?

When I activate the key switch for the slides the auxiliary pump doesn't come on.  But if I remove the cover from the pressure switch
at the pump and squeeze the contacts together the pump comes on, purges and shuts off immediately.  After that the key switches work fine, until the next time I want to move a slide in or out.

Anybody know if it's a relay or the pressure switch?

Re: Auxiliary Pump Relay or Pressure Switch?

Reply #1 –
You can check that the power solenoid that is on the hydraulic pump is closing and passing power to the rest of the system. Ours would complete the circuit sometimes and not at other times. I finally caught it and then I took it off and took apart and cleaned the contacts. Sounds like when the compressor comes on maybe the vibrations cause the contacts to complete the circuit.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: Auxiliary Pump Relay or Pressure Switch?

Reply #2 –
Traveling Man,

It almost sounds like mechanical of the pressure switch. Mine does the same thing occasionally, so I'm going to lubricate the friction points of the mechanism.

Jim
Jim Frerichs
2002 U320 42'