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Old 09-23-2013, 08:33 AM   #1
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Join Date: Sep 2013
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How to change Hydraulic Fluid in slide-out pump


I just purchased a Class C 2003 Gulf Stream Ultra 24.5 with 9,500 miles. I've been going through all of the systems making repairs and doing some long overdue preventive maintenance before I head out on the road. The RV has sat for a long long time, as you can most likely gather from the year to milage ratio.....I want to change the hydraulic fluid in the slide out pump, but I cant find any manual or instructions on how to change the fluid, only how to add fluid. The pump is a Dewald single slide out pump. I found the parts and service manual online, but no instructions on how to change the fluid. Thanks for your time and any recommendation. Here is the link to the service manual, but again, it doesn't have any instructions on changing the fluid, it only says that you need to change it every 24 months.

Parts and service manual for Gulf Stream hydraulic slide o

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Old 09-23-2013, 08:45 AM   #2
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Join Date: Mar 2012
Location: Palmer Ak
Posts: 1,124
OP, look at page 25 and it states 'drain the tank with a siphon'. You can get one at most auto part store or I use a baster to remove fluid from power steering pumps.

2009 38' Diplomat
CSM- retired, wife as co-pilot
Reka & Ali providing security (our 2 labs)
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Old 09-24-2013, 10:34 AM   #3
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Posts: 1,152
go to walmart and buy a outboard motor fuel line/primer setup. it consists of a squeeze bulb, and a couple of pieces of hose. you can siphon almost all of the old fluid out with this. i use this when i replace regular fluid with low temp fluid,or when i find a tank overfilled
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fluid, slide

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