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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 02-17-2020
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Default HWH Hydraulic Jack Repairs

OK, tell me I'm. Crazy!
I pretty much have everything on our SP working as it should and YES , we still love her and its reliability! The one annoying thing is when parked off level one of the rear Jack's tends to sag just like me. Has anyone tried a seal additive before doing the big job of pulling the unit for rebuild . Going to HWH is out of the question for us at this point.
Oh ya, I tried the additive on myself and it did not help...
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Last edited by Bill Pape; 4 Days Ago at 10:51 AM. Reason: Title
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Old 02-17-2020
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Take it off and fix it!
Its not bad at all.
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  #3  
Old 02-17-2020
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Quote:
Originally Posted by biobug View Post
OK, tell me I'm. Crazy!
I pretty much have everything on our SP working as it should and YES , we still love her and its reliability! The one annoying thing is when parked off level one of the rear Jack's tends to sag just like me. Has anyone tried a seal additive before doing the big job of pulling the unit for rebuild . Going to HWH is out of the question for us at this point.
Oh ya, I tried the additive on myself and it did not help...
Quote:
Originally Posted by Randy Dupree View Post
Take it off and fix it!
Its not bad at all.
Seems like that would be a solenoid problem unless the jack, the lines or fittings are actually leaking oil on the ground?
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Old 02-17-2020
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If the piston seal is leaking, it is possible for the rod to retract without any external leak.
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Old 02-17-2020
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Sorry didn't get to finish, the oil transfers from one side of the seal to the other
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Old 02-17-2020
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Quote:
Originally Posted by Dave&Beth View Post
Sorry didn't get to finish, the oil transfers from one side of the seal to the other
These are single action cylinders.

If the oil passes the seal it goes out of the jack and will run down the shaft to the ground. The only entry and exit from the jack is the single line. Unlike a dual action cylinder that is forced up or down, the HWH jack is forced down and held by a valve in the control. When the valve is released the fluid runs back to the reservoir as a result of the jack being retracted by the coach weight and the return springs..
If the jack is retracting but there is no fluid leak then the control valve is at fault.
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Old 02-17-2020
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Quote:
Originally Posted by gcyeaw View Post
These are single action cylinders.

If the oil passes the seal it goes out of the jack and will run down the shaft to the ground. The only entry and exit from the jack is the single line. Unlike a dual action cylinder that is forced up or down, the HWH jack is forced down and held by a valve in the control. When the valve is released the fluid runs back to the reservoir as a result of the jack being retracted by the coach weight and the return springs..
If the jack is retracting but there is no fluid leak then the control valve is at fault.
I am not that familiar with these jacks and will heed your experience. So I am asking you, is the rod seal only just a wiper with no real packing to speak of?
I ask this because not all single acting hyd cylinders are designed to leak seepage. Lift truck main lift cylinders are all single acting and do not leak unless the rod seal has failed along with the piston seal. The Pistons have check valves that allow oil to transfer back.
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Old 02-17-2020
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Quote:
Originally Posted by Dave&Beth View Post
I am not that familiar with these jacks and will heed your experience. So I am asking you, is the rod seal only just a wiper with no real packing to speak of?
I ask this because not all single acting hyd cylinders are designed to leak seepage. Lift truck main lift cylinders are all single acting and do not leak unless the rod seal has failed along with the piston seal. The Pistons have check valves that allow oil to transfer back.
With these jacks the rod is the piston. Somewhere in the forum there is a pic, but there is just one seal.

Here is a thread on one model of the jack. This one has a small cylinder to swing it down, then the main cylinder lifts the coach.

https://www.wanderlodgeownersgroup.c...wh+disassembly

Here is another thread for a different model.

https://www.wanderlodgeownersgroup.c...ssembly&page=4

On the ones I had there was a plug in the bottom of the foot. Take that out and there is a rod that goes through a hole up the center of the piston. The rod is bigger at the bottom and stops the piston from popping out. Unscrew the rod and the piston will pull out to service the seal. etc.
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Last edited by gcyeaw; 02-17-2020 at 04:16 PM.
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Old 02-17-2020
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There is 2 seals,one set of seals on the piston and 1 set where the shaft comes out of the tube.
They can leak without oil hitting the ground.
A few years ago i stopped in at HWH to get a few things done,one of my jacks would not return to the stored position.
HWH told me the piston seal was leaking and fluid was between the piston and the tube seal,which would not let the piston return to stored position.
It would have returned if the bottom tube seal would leak.
and i guess with time it would have leaked too.
So what Johns saying is possible.
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  #10  
Old 02-17-2020
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Quote:
Originally Posted by Randy Dupree View Post
There is 2 seals,one set of seals on the piston and 1 set where the shaft comes out of the tube.
They can leak without oil hitting the ground.
A few years ago i stopped in at HWH to get a few things done,one of my jacks would not return to the stored position.
HWH told me the piston seal was leaking and fluid was between the piston and the tube seal,which would not let the piston return to stored position.
It would have returned if the bottom tube seal would leak.
and i guess with time it would have leaked too.
So what Johns saying is possible.
Well, learn something new every day I know there are lots of models of HWH jacks, and I sure don't know about all of them, so as Roseanne Roseannadanna. says "NEVERMIND"
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