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Old 07-19-2020, 02:44 PM   #1
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problem with slide outs

I have a 2004 class A motorhome. I had to replace the hydraulic unit. Now my slide outs will not move. Can anyone help on what I need to do?
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Old 07-19-2020, 03:37 PM   #2
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Would help if you posted make and model of MH you have. Or put that information in your profile.
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Old 07-19-2020, 03:50 PM   #3
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Would help if you posted make and model of MH you have. Or put that information in your profile.
Thank you. I have a 2004 Class A Windsport made by Thor
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Old 07-19-2020, 03:53 PM   #4
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I'm new at this site and don't understand it yet. Help in that area would help also.
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Old 07-19-2020, 04:12 PM   #5
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Thank you. I have a 2004 Class A Windsport made by Thor
Well, since your Windsport is not a Forest River product, not sure anyone here will be familiar with your MH.
You'll need to provide much more information, starting with the model number of your Windsport.
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Old 07-19-2020, 04:17 PM   #6
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I can do that. The hydraulic system that was in there was a Dewalt which they don't make any more. I bought a hydraulic pump and reservoir and installed. Had to thread manifold for hoses.
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Old 07-19-2020, 05:35 PM   #7
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Can only speak to basic hydraulics-------

Does motor run?

Has air been bled from system?

Do solenoid valves operate when they're supposed to?

Check fuses and wire connections if answer to #1 and #3 are "no".

Aside from electronic control panels most hydraulic systems follow the basics pretty much.
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Old 07-19-2020, 05:48 PM   #8
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Can only speak to basic hydraulics-------

Does motor run?

Has air been bled from system?

Do solenoid valves operate when they're supposed to?

Check fuses and wire connections if answer to #1 and #3 are "no".

Aside from electronic control panels most hydraulic systems follow the basics pretty much.
I bleed the air from new pump. Also bleed other lines for air. The electric part, I'm going direct to pump for power. Coils are energizing.
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Old 07-19-2020, 06:24 PM   #9
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I bleed the air from new pump. Also bleed other lines for air. The electric part, I'm going direct to pump for power. Coils are energizing.
Have you bled air at the hydraulic cylinders downstream from the solenoid valves?
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Old 07-19-2020, 06:27 PM   #10
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I did for the living room. I have 3 slide out. The living room has been the one I've been working on. Although, I have tryed the bedroom but to know a vail
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Old 07-19-2020, 06:42 PM   #11
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Another possibility I just thought of. Most hydraulic pumps have a pressure relief valve on them. If it is adjusted all the way as low as it can go you will get no pressure built up.

I've found that when the hydraulic pump starts up and a solenoid opens the pump will run freely until pressure builds. If fluid is not flowing through valves you will hear fluid bypassing through the relief valve. The higher the pressure it's set for the more noise it makes.

Just another basic item to check. With the pump running there should be clearly some pressure visible when you loosen a connection both into and out of one of the solenoid valves. If it just dribbles you may have no pressure.

I'm drawing on experience picked up from the mid 60's when i was in the Army but like I said at the beginning, just basics.
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Old 07-19-2020, 06:50 PM   #12
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I wounder where the pressure valve located on thw pump. Let me look at the tomorrow. Is the pressure valve adjustable?
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Old 07-19-2020, 07:18 PM   #13
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Pressure relief valves are usually incorporated into the pump body which is between motor and reservoir. Adjustment is usually covered by a cap that once removed reveals either a slotted shaft of socket ended shaft with threads. There also is usually a port that's plugged and is for a pressure gauge, either as an option or for service.
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Old 07-19-2020, 07:20 PM   #14
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Do you adjust with the pump running, or off?
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Old 07-19-2020, 11:03 PM   #15
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Do you adjust with the pump running, or off?
Pump running while trying to extend/retract a slide-out.
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