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Old 10-16-2012, 09:31 AM   #1
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Thor Owners Club
Join Date: Jun 2006
Location: Tennessee
Posts: 266
lippert hydraulic pump leaking

hydraulic lippert slideout pump leaking. It seems to be coming from where the fluid tank is fasten to the motor. I am thinking it is the o-ring. Has anyone had this problem? if so how did you go about fixing and did it stop the leak?

Tom and Nancy
1998 Four Winds class C, 31ft, V-10
2008 ford Taurus in tow
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Old 10-16-2012, 09:34 AM   #2
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Lippert Seal Replacement - iRV2 Forums

Bob Retired Army Traveling alone now except for Charlie the Beagle.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2016 Dodge Ram 1500 4x4 Quadcab
Western MT in summer, AZ, NV in winter
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Old 10-17-2012, 01:21 PM   #3
Join Date: Sep 2012
Posts: 42
I just fixed the same pump. It only was leaking when hauling. I used a 4.25 " 3/16 oring. It is very hard to remove the tank. I had to take the pump loose from the pan and it took 30 minutes. I messed up the first time and got the wrong oring. It was 4.5". The next time I changed it out I used extensions on my rachet so the handle was pasted the end of the tank. It took about 5 minutes to pump out remove and install and fill. Make sure your handle is past the tank and it's quick.

Important..There is no need to bleed the lines. The air goes out the breather.( slides in and out a couple times fixes it) With the slides in fill to about 1 inch below the top and you can declare victory on it. Mike sure you clean or install a magnet to the metal part of the filter. Let me know how it goes.
Use ATF +4 syn. A little more than 2 quartes.
2003 38' Montana 3S, 2006 Dodge Ram Dually 5.9 4WD, Auto, Derale DD Tranny Pan, Ispro EV-2 Gauges, FASS Fuel Pump.
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Old 09-12-2015, 01:21 PM   #4
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Thanks to those who posted to this thread. My father in laws 2002 Montana was leaking hydraulic oil at the plastic reservoir too. I ordered o rings from Grainger (Item # 1KLV1) and changed it out today. Not a bad job, sucked out the oil from the reservoir, w/a long extension removed the 4 bolts and reservoir came off the motor/pump assy. The new o ring was somewhat thicker, not sure if was a larger o ring or the old one had shrunk but had to loosen the square aluminum block mounted on top of the pump to allow a tad more clearance to get it to fit in the pump housing groove.
2013 Phaeton 40 QBH
pulling either a 06 Miata or 14 CRv
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Old 09-14-2015, 09:10 AM   #5
Join Date: Sep 2012
Posts: 42
Hi Don... It's been a couple years since I posted my fix for the leak. I never did get it to stop leaking. Those pumps cost between $1000 and 1200. I searched all over the web for a cheap one and found the exact pump and tank from RV Upgrades. Dont remember the cost but I think it was around $300, I called the OEM and they said that RV upgrades buys so many the get the low price. If it is not leaking today, go buy a swimming pool noodle (flotation ) for kids. Reduce vibration. Cut some pieces and insert under tank. There is an aftermarket tank out there, I just dont remember where.

Let me know what happens
2003 38' Montana 3S, 2006 Dodge Ram Dually 5.9 4WD, Auto, Derale DD Tranny Pan, Ispro EV-2 Gauges, FASS Fuel Pump.
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