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Old 04-14-2013, 01:05 PM   #1
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Question Bleeding Air out of Hydaulic Slideout System

Does anyone know how to bleed the air out of a hydraulic slide-out system? Changed the seals/gaskets in Dewald pump & now the slide-out will not go in or out. Motor is running. I have a 1995 Aluma-Lite Holiday Rambler 5th Wheel. Trailer is kept inside when not in use. Changed seals due to the drifting of the slide-out. Dewald has sold out to PowerGear & their info has been helpful except they state to extract & retract room to purge air. The room does not budge. Thanks for any help.
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Old 04-14-2013, 01:39 PM   #2
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check your fluid level is it low or kind of milky looking if it is the fluid is full of air bubbles . if it is just let it set for an hour or two then fill the tank and try again. it will work out on its own by running the slide in and out but if the fluid has to much to much air in it the pump cant produce enough pressure to move the slide.
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Old 04-14-2013, 01:48 PM   #3
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Thanks for your reply. I have checked the fluid & it is not milky. After I changed the seals & reinstalled the pump, the slideout moved just a few inches, I checked the oil level, adding just to the fill level. Now the slide out will not go in or out, so the air does not bleed out.
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Old 04-14-2013, 02:01 PM   #4
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i assume that the only thing this runs is a single slide. how far apart did you have the pump
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Old 04-14-2013, 02:19 PM   #5
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Yes, all this runs is a single slide. Didn't quite catch that last question/comment.... Thanks.
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Old 04-14-2013, 02:26 PM   #6
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when you said you changed seals in dewald pump did you mean in the hyd cylinder or in the actual hyd pump that is located in the in the fluid tank attached to the dc motor
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Old 04-14-2013, 02:30 PM   #7
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Seals in the pump assembly.
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Old 04-14-2013, 02:47 PM   #8
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looking on line for break down of hyd pump dont know if you have done this yet but if you Google dewald hydraulic pump you will get the parts and service manual. sounds like you lost all pressure right away. i would start by making sure a o rig or seal was not cut when you reassembled it. if not follow the diagnostic procedure in the service manual
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Old 04-14-2013, 07:15 PM   #9
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Thanks....
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Old 04-14-2013, 08:52 PM   #10
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A quick way, if you can get at the hydraulic line attached to the hydraulic cylinder, loosen the nut on the line attached to the hydraulic cylinder, DO NOT REMOVE, just loosen a little bit turn on pump, if there is air in the line it will escape and be replaced with hydraulic fluid, if there is no air or no fluid your pump is not working. Now you have to do this at both the retract and extend end of the cylinders. The retract end is the fitting near the piston end of the cylinder. good luck
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