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Old 10-04-2022, 08:30 AM   #1
AppliedThinking
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Default 97 Sun Sport Big Foot hydraulic jack Rebuild?

Both my front 97 Sun Sport Big Foot hydraulic jacks/levelers will not stay retracted nor lift. It looks like the front end road and engine vibration has played a part in the problem. The rear jacks work fine, for now.



Currently I manually keep them retracted using heavy duty rubber bungee cords from Home Depot.


Is there a rebuild kit or known repair for the Big Foot hydraulic jacks/levelers?


I did change out the solenoids and installed a separate safety power disconnect solenoid some time ago. I had the unpleasant experience of the jack raising with a stuck solenoid that I could not turn off. Bad design but now fixed.


The only other thing would be to replace the front hydraulic jacks. I am not sure if there any manufacturer that would use the same controls?


Thank you in advance, JohnF
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Old 10-05-2022, 03:07 PM   #2
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I found the Quadra site for Bigfoot levelers. I am in communication with their technical staff as well. My next action if to find out which cylinders I have. Supposed to a sticker somewhere on the cylinder. My system is older that their oldest Operators Manual. I may just remove the two front leveler assy for rebuild anyway.


The site:



Bigfoot Hydraulic Leveling System Product Manuals
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Old 10-09-2022, 02:31 PM   #3
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Default Jacks

I had my cylinder rebuilt on my left front for $200 I took it off and put it back on. I also replaced the rest of the unit I found new on eBay for $300. The hydraulic shop also sold me an extra set of seals so next time Iíll do it myself
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Old 10-09-2022, 03:22 PM   #4
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I HAVE READ OF SOME VINTAGE BIGFOOT BEING OBSOLETE AND parts or replacement not available, but sounds like you have many local or national or MFR options still not eliminated? Look for local hydraulic repair shops? Good Luck
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Old 10-09-2022, 04:15 PM   #5
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Not all shops will even touch motorhome jacks. I found that out
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Old 10-10-2022, 07:35 AM   #6
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Quadra Manufacturing can supply complete leveler which includes jack and hydraulic unit. The cost depends on the diameter of the cylinder. Their newer cylinders a rebuildable, unfortunately mine was not.



I ordered a complete unit which was $1100. Installation is not fun if the cylinder will not lift the coach. You need a 6 Ton floor jack to lift the one of the rear corners on a diesel pusher, even then that is a bit scary.
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Old 10-10-2022, 03:11 PM   #7
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$1100 is a joke. Everything on the unit can be rebuilt just finding someone to do it is the hard part. A local hydraulic can do it. If the Jack works lift it up block the frame and remove the unit the fronts are easy now the back are a different story
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Old 11-13-2022, 02:33 PM   #8
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To share lessons learned. My BigFoot hydraulic jacks are too old and there are no kits available for the older QEI-21. The suggested replacement is QEI-16 at $500 ea. The same pump assy can be reused. I decided to try a full system flush with each jack. That entails aprox 3 liters of DEX-III/MERC for each cylinder system. Using the wiring guide, a short alligator jumper can be used to activate the solenoids while pumping out the old fluid. I used a quart oil hand pump (Slippery Pete) to refill when it was time. In one case, I had my better half doing the extend switch since I could not reach the 12v buss bar. Lesson learned - Don't let it suck air. Takes two different ID hoses - One to fit over the steel line and the other over the nipple. Use a Gal jug for the old fluid.

The backs are done and are solid. Next is the front jacks that are not working very well. Fingers crossed. I will do the front jack at the same time replacing the sway bar mounts.
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Old 11-26-2022, 10:30 AM   #9
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Well the hydraulic flush did not work. The jack would not stay down or up. So it was decision time of purchasing the QEI-16 cylinder or the complete corner for each of the two front jacks. I certainly did not want to think about crawling under the RV with a bottle jack while on the road especially in bad weather. So I went with two complete corner systems and will keep the older QEI-21 jacks for spare parts in case the rear ones start to go south. This was the quickest and most guaranteed way to fix the issue at hand. Safety is key in my book. At least now I will be able to see the fluid level in the tank in stead of using long wooden Q-Tips for dip sticks in the older steel tanks. I will definitely cover the extended jacks while parked especially when at the beach. I will also wipe them down before retracting. The fine beach sand is a jack killer for sure. I am sure there is a hydraulic shop somewhere in San Diego area. Maybe if the back jacks tart to fail. I would fully agree with the above statement needing strong jacks for the back end. I will get the RV weighed once it's back on the road.
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Old 11-27-2022, 11:23 AM   #10
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I spray the cylinder rods with PB Blaster silicone lubricant before I raise the levelers each time. It has rejuvenated 2 of the seals that we beginning to seep.

All four of my cylinders are the same size.

I kept the pump off the one complete unit I replaced for a spare.

The new cylinders Quadra / Bigfoot make can be rebuilt.
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Old 12-05-2022, 07:40 AM   #11
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Hello...my rig is a 1998 and i do have the oldest jacking system and Quadra BigFoot Customer support told me that they do not make any replacement parts...and that i need to replace the full computer system at about $1,000...
My RV is 40ft and grossweight 36,000lbs...and i do have air ride suspension....so when i stop the pusher engine...all 4 ballons collapse.. and the RV become very very Low to the ground...so jacks are very hard to reach out...and very scary to go under ...My computer / keyboard is the one with old interface...and nothing today is compatible. Also my front left jack is leaking...Now my RV is stored fir winter but in April 2023...i need to fix my jacks...BIG Job... :- (
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Old 12-05-2022, 07:57 AM   #12
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Send a picture of your interface unit.


Can you manually move any of your levelers?
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Old 12-05-2022, 08:11 AM   #13
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First...i do not know How to put a picture...sorry...

The control panel is the old one with the botton SEMI written...on it...

Yes... i can rise and retract all 4 ...but not all the time...maybe finger problem...and my front-left jack leaking so before i empty the reservoir...i quit playing with the leveling system...
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