Good morning,I have a 1997 Thor Residency MH I bought about a month ago and the hydraulic jacks and slide (2) do not work. The electric motor has been replaced and seems to work/spin over fine. The tank is full of fresh/clean fluid and there are no leaks on any of the hoses/jacks/connecters etc. I just recently replaced the shuttle valve (based on my discussions with HWH) but that did not fix the problem. When I push the lift button for the jacks the motor spins (very fast), but nothing happens. If I push the retract buttons for the jacks it just clicks (probably because the jacks are already retracted). The hydraulic slide switched click if pushed in or out, but nothing happens. I even increased the pump pressure, per HWHs recommendation, but adjusting a screw on the side of the assembly, but that didn't help.HWH said I need to replace the hydraulic pumps/tank assembly. Before I spend about $800.00, I wanted to ask if anyone else has any ideas or experience? Can this part be rebuilt by anyone or does anyone besides HWH sell this part. The information on the pump/tank/motor assembly is:Pump/Motor/Tank: AP0588S.N.: 10641Assembly: AP10514Thanks again.

On the end of the electric pump motor is a metal keyway. THAT can fall out and if NOT installed the motor does NOT engage the pump assbly. The motor will do as you state---spins fast because there is no torque on the motor. Remove the electric motor and you will see how this keyway engages. You will also see if it is GONE. DougThe older Parker pump motors had this keyway. Since you have a 1997, the odds are you have this keyway. Newer HWH pump motors do not have this keyway

You will probably get some solid information from this list on your problem but it sounds like even HWH is stumped. I too would be afraid to purchase a new pump on their recommendations. I'll give you the best advice your gonna get. Hope and pray that dougrainer will see your query and respond. He is brilliant when it comes to this type of problem.

It sounds like the circuit is open and it is just pumping oil through the valve bank and back to the tank. The valves can be operated manually using a sharp point, screwdriver like. Presuming your unit is similar, you should see two or three cylindrical valves that are horizontal on the top of the unit. If you look at the end of each there is a small hole. With the pump motor running, depressing these inside the hole should move the valves and produce an actuation. I would also check that the dump valve is not jammed in the open position, I question this as the cause as you said you heard the click of the dump valve. The retract, or dump valve operates without the need of the motor. Hope this is of some help.

Thanks for the replies. I did look at the valves on top of the unit. I have a total of 8 (4 for the jacks and 4 for the 2 slides). However, there is only a "T" handle on the back and the wires going in. No hole or adjustment spot. One thing I forgot to mention is that even when the electric motor is running, there is no fluid being moved by the pump. I took off a U shaped tube on the top that directs fluid to the shuttle valve and there was no fluid in it, leading me to believe that the pump isn't doing anything even though the motor is spinning.

ThorResidencyNewbee wrote:Thanks for the replies. I did look at the valves on top of the unit. I have a total of 8 (4 for the jacks and 4 for the 2 slides). However, there is only a "T" handle on the back and the wires going in. No hole or adjustment spot. One thing I forgot to mention is that even when the electric motor is running, there is no fluid being moved by the pump. I took off a U shaped tube on the top that directs fluid to the shuttle valve and there was no fluid in it, leading me to believe that the pump isn't doing anything even though the motor is spinning.READ What I stated. Doug

HWH Hydraulic system problem - recommendations

24 Replies

ThorResidencyNe
Explorer
Apr 25, 2013
Thanks for the replies. I did look at the valves on top of the unit. I have a total of 8 (4 for the jacks and 4 for the 2 slides). However, there is only a "T" handle on the back and the wires going in. No hole or adjustment spot. One thing I forgot to mention is that even when the electric motor is running, there is no fluid being moved by the pump. I took off a U shaped tube on the top that directs fluid to the shuttle valve and there was no fluid in it, leading me to believe that the pump isn't doing anything even though the motor is spinning.
Lug_Nut
Explorer
Apr 25, 2013
It sounds like the circuit is open and it is just pumping oil through the valve bank and back to the tank. The valves can be operated manually using a sharp point, screwdriver like. Presuming your unit is similar, you should see two or three cylindrical valves that are horizontal on the top of the unit. If you look at the end of each there is a small hole. With the pump motor running, depressing these inside the hole should move the valves and produce an actuation. I would also check that the dump valve is not jammed in the open position, I question this as the cause as you said you heard the click of the dump valve. The retract, or dump valve operates without the need of the motor. Hope this is of some help.
hershey
Explorer
Apr 25, 2013
You will probably get some solid information from this list on your problem but it sounds like even HWH is stumped. I too would be afraid to purchase a new pump on their recommendations.
I'll give you the best advice your gonna get. Hope and pray that dougrainer will see your query and respond. He is brilliant when it comes to this type of problem.
dougrainer
Nomad
Apr 25, 2013
On the end of the electric pump motor is a metal keyway. THAT can fall out and if NOT installed the motor does NOT engage the pump assbly. The motor will do as you state---spins fast because there is no torque on the motor. Remove the electric motor and you will see how this keyway engages. You will also see if it is GONE. Doug

The older Parker pump motors had this keyway. Since you have a 1997, the odds are you have this keyway. Newer HWH pump motors do not have this keyway

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HWH Hydraulic system problem - recommendations

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