Crown 35RRTT:
Pump motor keeps running

pump motor will not shut off, raise and lower switch are good. Only one pump motor on this unit.
  • Posted 4 Apr 2007 00:20
  • Discussion started by albert_h
  • California, United States
Showing items 1 - 9 of 9 results.
Can you also send me a copy of the schematics as I am having an issue with the lift as well. I can not get the lift pump contactor to engage unless i manually push it shut. I am getting battery voltage at the contactor when activating the switch. Any ideas?
  • Posted 11 Oct 2022 07:15
  • Reply by Ricky_Gilmore
  • Florida, United States
rgilmore
check your lift switches. the steer pump supplies the reach and tilt
  • Posted 16 Feb 2008 15:05
  • Reply by whoknows
  • Ohio, United States
Did someone remove your e-mail address?
  • Posted 9 Apr 2007 02:43
  • Reply by Truck_Tech
  • United States
yes its [email address removed]
  • Posted 6 Apr 2007 23:14
  • Reply by albert_h
  • California, United States
No,the lift pump contactor is controlled by the Multi-Function Swiitches(MFS) 1 & 2.Theses switches signal the Sequence Control Unit to turn on the pump,when that function is activated. At the top of the contactor panel,there is a box with a plastic over. That is the SCU. Inside that,there are (4) four cards,the power supply board,the seguence logic control board,the coil driver board,and the light control board. More than likely,the driver which controls the lift pump contactor is shorted. That's why the contactor activates,as sooon as the keyswitch is closed. Do you have an email address,where I can send you a schematic?
  • Posted 6 Apr 2007 07:45
  • Modified 6 Apr 2007 09:51 by poster
  • Reply by Truck_Tech
  • United States
contactor tips are in need of change but not welded together and yes it does activate as soon as key switch is turned on? could the selector switch cause the pump to stay on?
  • Posted 5 Apr 2007 23:19
  • Reply by albert_h
  • California, United States
Are the pump contactor tips welded together? Does the pump contactor activate,as soon as the keyswitch is turned on?
  • Posted 5 Apr 2007 09:03
  • Reply by Truck_Tech
  • United States
35RRTT SERIAL #W61468
  • Posted 4 Apr 2007 23:07
  • Reply by albert_h
  • California, United States
What model# truck is it?
  • Posted 4 Apr 2007 11:44
  • Reply by Truck_Tech
  • United States

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