Earlier this year our HWH pump died and we had a Mobil Tech in Oregon replace it for us. Now the slide is creeping in about two inches.The hydraulic lines were not opened and only the pump motor was replaced. I did have to crank the slide in by hand, something I would gladly pay to have done if another failure occurs.I read somewhere in the HWH literature that the system was self bleeding, I can't find any info on bleeding the system.Any ideas?Update of sorts from 11-14, I have a limited education in hydraulics and I am not criticizing anyone's answer but I just don't understand how there can be pressure in a hydraulic system when the pump is off. Okay, with a check valve in place and when a system is pressurized there will be some static(I believe that's the right word) energy in the system but isn't it expended as soon as the system is operated with the pump off? My understanding is that a liquid(hydraulic oil in this case) cannot be compressed so, shouldn't even an itty bitty leak release the static energy instantly? How can there be enough energy to move my dinette/sofa slide 2 to 4 inches?I truly do not understand.

You have a bad check valve which is part of the valve. Replace it.

donn0128 wrote:You have a bad check valve which is part of the valve. Replace it.agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.

Replacing the pump motor would not cause your problem. Yes, HWH systems are self bleeding. Just extend and retract 4 or 5 times and that will remove any air. Replacing the Pump Motor would not cause air in the system. Creeping out or in with no visible leaks is one of the extend or retract solenoids. They are leaking internally. You can manually open both extend and retract and run the room for 15 to 30 seconds and if there is any trash on the needle valve , that usually removes it. If not you replace the retract valve. Doug

rk911 wrote:donn0128 wrote:You have a bad check valve which is part of the valve. Replace it.agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.If it would be more convenient you could even add another check valve in line. In other words, if the check valve is part of another component just add another. Can't hurt.

mikestock wrote:rk911 wrote:donn0128 wrote:You have a bad check valve which is part of the valve. Replace it.agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.If it would be more convenient you could even add another check valve in line. In other words, if the check valve is part of another component just add another. Can't hurt.Can't do that on HWH systems. The solenoid is NOT a Check Valve. It just opens and closes as fluid has to run BOTH ways. Doug

Slide creeps in, not out. | Good Sam Community

donn0128
Explorer II
Nov 13, 2018
You have a bad check valve which is part of the valve. Replace it.
rk911
Explorer
Nov 13, 2018
donn0128 wrote:
You have a bad check valve which is part of the valve. Replace it.

agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.
dougrainer
Nomad
Nov 13, 2018
Replacing the pump motor would not cause your problem. Yes, HWH systems are self bleeding. Just extend and retract 4 or 5 times and that will remove any air. Replacing the Pump Motor would not cause air in the system. Creeping out or in with no visible leaks is one of the extend or retract solenoids. They are leaking internally. You can manually open both extend and retract and run the room for 15 to 30 seconds and if there is any trash on the needle valve , that usually removes it. If not you replace the retract valve. Doug
mikestock
Explorer
Nov 13, 2018
rk911 wrote:
donn0128 wrote:
You have a bad check valve which is part of the valve. Replace it.

agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.

If it would be more convenient you could even add another check valve in line. In other words, if the check valve is part of another component just add another. Can't hurt.
dougrainer
Nomad
Nov 13, 2018
mikestock wrote:
rk911 wrote:
donn0128 wrote:
You have a bad check valve which is part of the valve. Replace it.

agreed. we had hydraulic slides and jacks on a previous motorhome. for each slide and pair of jacks there were two solenoid valves.. in/out and up/down. you likely have a leaky "out" valve on your slide.

If it would be more convenient you could even add another check valve in line. In other words, if the check valve is part of another component just add another. Can't hurt.

Can't do that on HWH systems. The solenoid is NOT a Check Valve. It just opens and closes as fluid has to run BOTH ways. Doug
D_E_Bishop
Explorer
Nov 14, 2018
Thanks to all, unfortunately we are in a somewhat remote area and I don;t want of crawl under the rig in the sand to attempt any repairs. We'll be home on Friday afternoon and I'll try Doug's suggestion and maybe replace the "o"ring in the poppet valve but I don't think that will have any effect.
dougrainer
Nomad
Nov 15, 2018
D.E.Bishop wrote:
Thanks to all, unfortunately we are in a somewhat remote area and I don;t want of crawl under the rig in the sand to attempt any repairs. We'll be home on Friday afternoon and I'll try Doug's suggestion and maybe replace the "o"ring in the poppet valve but I don't think that will have any effect.

Don't attempt to replace the o-ring's. There are a few not just one. When you remove the solenoid, it will shave/cut some of the O-rings. While HWH sells the O-rings, they never advise to replace them. They replace the complete solenoid under warranty. It is NOT the O-rings causing your problem. It is the needle valve that is allowing the fluid thru. Doug
D_E_Bishop
Explorer
Nov 16, 2018
Okay Doug I got it. I will be doing what you sugested on Saturday when I'm home. What still bothers me is with the pump off, where is there enough pressure stored to cause the room to move 2 to 3 inches?

That would seem like a lot of movement.
dougrainer
Nomad
Nov 16, 2018
D.E.Bishop wrote:
Okay Doug I got it. I will be doing what you sugested on Saturday when I'm home. What still bothers me is with the pump off, where is there enough pressure stored to cause the room to move 2 to 3 inches?

That would seem like a lot of movement.

HWH rooms have static pressure ALL THE TIME. Whether extended or retracted. So, if you have an external or internal leak, the difference in pressure on one side will cause the room to move slightly. To see how much a room will move, just release BOTH extend and retract solenoid quick release tabs on the end of the solenoids. Doug
77rollalong
Explorer
Nov 16, 2018
you could also put in a pressure releaf valve/check valve on the extend side of the cylinder for about 150lbs so that the fluid cannot escape back through the spool valve untill pressure is applied to the retract side of the cylinder

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