Service Jack Repair

[Don52]

The last step was re-assembling the jack with the new spring guidance can. If you didn't know any better, you couldn't tell the new can from the old one.

14. New can installed


And here is the jack all done.

15. Jack all done
...

[Don52]

So the way it works is that the spring pushes on the new can. The new can pushes on the original washer, which has a counter bore on the top which holds a clip ring. The clip ring pushes on a groove in the piston. When you push the jack handle down it compresses a piston, which lifts the load. When...

[Don52]

The next two pictures show the new washer welded to the EMT conduit.

7. Washer welded to EMT conduit


8. Penetration of weld on back side


Next I pressed the original washer into the top of the new can.

9. Original washer installed...

[Don52]

The can was originally made by rolling over the edge of a cylinder to trap a washer.
We decided to make a new can by welding a piece of 1-1/4" EMT conduit to a new washer to simulate the rolled over edge and to use the original washer on top of the new washer. I had to soak the EMT conduit...

[Don52]

I borrowed a service jack from my friend John's son, to help us move the machine tools into the new addition, Just about the time we were finished using it, the jack wouldn't raise, when you pumped the handle. Upon inspection we noticed that the screw that attached the handle to the jack had become...