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dddlin

Hydraulic Pump Will Not Function

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We have a 98 Newmar Dutchstar. HWH 310 series leveling system.

Levelers worked fine yesterday. Had work done on generator today which included removing and re-installing the generator which is right next to the leveling system. Now levelers do not work. Control panel gets power. We can dump air, but get no response when we hit the button to lower the jacks. The solenoid is getting power. Checked fuses and they appear to be okay.

Called HWH and was told their service representative have a 3-week backlog on returning phone calls.

Any suggestions? Thanks.

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Is the ding ding alarm sounding? If it is, you are low on fluid. If not, I would look for a plug that has been disconnected or is loose at the pump.

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One more thing - the "Not in Park" light is on even though the brake is definitely set and the coach is in Neutral, light on the dash says "PARK", and the motor is off.

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dddlin, Listed are links to the service information for you system. I listed them not knowing how your coach is set up. They cover the 310 series when used is different applications.

From your information it sounds like you can(could) lower the coach and retract the jacks , but not extend them. That sounds like no power to the hydraulic pump. Check for any lockouts that prevent the pump from getting power.

With the work on the generator and the proximity of the HWH wiring, a connection, wire or fuse could have been compromised as suggested by others.

http://www.hwhcorp.com/ml13514.pdf

http://www.hwhcorp.com/ml12771.pdf

http://www.hwhcorp.com/ml21956.pdf

http://www.hwhcorp.com/ml23521.pdf

http://www.hwhcorp.com/ml23522.pdf

Rich.

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Thanks so much for the info. The first document describes our system. I'll let you know if anything works tomorrow. We are calling it quits for tonight - it has been a very long day.

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I recently had to learn what makes an HWH system work and sounds like a loose ground connection. Mines a couple years newer, but appears similar.

If you have power at the pump solenoid control circuit stud and it does not click when you hit an up button, then the ground is likely loose on control side of the solenoid.

If the solenoid clicks then the control circuit is closing and there should be power on both lugs of the load side of the solenoid when it's closed (button down).

If there is power going to the pump from the solenoid and the pump does not run then the ground connection from the pump is likely loose.

All the grounds for the HWH should be attached to the bracket under the pump or nearby on the chassis frame. Follow the negative cable from the pump motor to the lug where it is grounded and see if it is loose. Gen may have been grounded at the same location and the HWH cable left out or may have just gotten giggled loose.

Be careful if you need to tighten any lugs on the solenoid as it is very easy to short power across the lugs.

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