stretch5881
Active member
Howdy, I rebuilt my hein-werner os jack today. It pumps up beautiful but will not release. What did I miss?
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hein-werner jack help
- Thread starter stretch5881
- Start date
Howdy, I rebuilt my hein-werner os jack today. It pumps up beautiful but will not release. What did I miss?
Is the release gear rotating? Did you tear the release mechanism apart to replace the packing? If so.. When you reassembled did you make sure the gear was pressed down far enough for the gear to mate with the splined portion of the shaft?
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stretch5881
Active member
Every system I tore down, I rebuilt, and reassembled before going to the next system. The release gear is all the way on the splines and the packing replaced. The needle is threaded on the shaft and raises and lowers, so far as I can tell anyways. I am rotating the gear by hand, the jack is still disassembled. I am using the drill press to try to push the ram back in.
I believe in testing things before total assembly.
I believe in testing things before total assembly.
Every system I tore down, I rebuilt, and reassembled before going to the next system. The release gear is all the way on the splines and the packing replaced. The needle is threaded on the shaft and raises and lowers, so far as I can tell anyways. I am rotating the gear by hand, the jack is still disassembled. I am using the drill press to try to push the ram back in.
I believe in testing things before total assembly.
So the Hydraulic Unit isn't even inside the Frame? How tight do you have the packing nut? It takes quite a bit of grunt to push a Newly sealed Ram back into the cylinder by hand. Id be willing to bet its fine and will fall under load.
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stretch5881
Active member
You don't think that I could budge the ram in a drill press?
You don't think that I could budge the ram in a drill press?
Hydraulic Press? or a Drill Press? Obviously its going to need to be retracted in order to facilitate putting it back in the frame. Loosen the Valve, Turn the assembly on end and using the back of the Unit, push down against the floor. When that Ram is retracting its pushing a cylinder full of oil back through a tiny return hole/vein.. Hence the "Grunt" Portion of my earlier statement. You want to turn the star gear to the right to raise the needle off the seat.
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stretch5881
Active member
The only way the piston retracts is if I pull the valve all the way out.
OP
stretch5881
Active member
That would be my problem, it doesn't matter how far or which way I turn the valve, the piston doesn't budge.
The only way the piston retracts is if I pull the valve all the way out.
Retract it, Put the Release mechanism back in (correctly) and put it in the frame. My 500 plus OS/boy/WS Rebuild experiences tell me that it will be OK. The Reason it retracts so easily with the Release mechanism removed is that Return vein that mentioned earlier, is Now not the path of least resistance.
That would be my problem, it doesn't matter how far or which way I turn the valve, the piston doesn't budge.
How are you installing the Release mechanism? More importantly the Stop piece <-- The piece that threads into the block and the top piece threads around.
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stretch5881
Active member
Ok, that makes sense. I'll get to it a little later. I have to look at a water pump issue on the neighbor lady's van. Thank you Hiball.
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stretch5881
Active member
I had to get the parts sheet to understand. I threaded the stop all the way into the block.
OP
stretch5881
Active member
I'll bet that I should have threaded it into the nut and then into the block. Is it possible that it is blocking the hole?
I had to get the parts sheet to understand. I threaded the stop all the way into the block.
That's the easiest way to do it, Then barely thread the Needle into the Release mechanism enough to allow the square shoulder of the Needle to rest inside the square portion of the Stop and "ALSO" allow the Upper release mechanism to start to thread on the outer piece of the stop. Once you get it started.. Thread the Release down till its stops (Needle bottoms out on the seat) and "Slowly" turn the Gear to the Right while "simultaneously" threading the outer piece down till it bottoms out.
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stretch5881
Active member
Threading the stop into the block all the way blocked the side hole on this jack. I had to do it the hard way and thread it into the nut. A few times of adjusting the needle and it pumps up good. 2 turns of the handle and it comes down on its own.
Thank you Hiball for helping me to understand this part AND it was your threads that helped me decide to rebuild it in the first place.
Thank you Hiball for helping me to understand this part AND it was your threads that helped me decide to rebuild it in the first place.