Hobo,NC
Well-known Member
- Location
- Sanford, NC
This old Snap-On transmission jack YA714A about whooped me. I picked it up used about 30 years ago about 20 years ago it stopped working. I had a local hydraulic shop check it out he said he could not get it to work so I set it aside under my shed. When nnalert set in I found time to clean out from under my shed when I came across the jack I set out to take it all the way apart clean it up and re-seal it.
The base was full of rust and Teflon tape from previous attempts to seal the pump circuit’s cap/nuts. Cleaned it up all looked good installed new 0-rings, all the O-rings matched up to off the shelf basic standard O-rings. It worked right off the bat once I got the second stage fully extended I applied a generous amount of hand pressure to the pump peddle as then all of a sudden it puked oil out the top retaining nut for the second stage cylinder. I pulled it apart the O-ring looked good so I tried a harder O-ring I had the same issue now it was cutting the O-ring. At first I thought it used some exotic O-ring I would never find I had the O-ring grove measured it fell into a odd size for the application. I then set out to make a custom O-ring all was good BUT it also cut the one I made.
Then it hit me somehow the second stage cylinder was cutting the O-ring when it maxed out. I took it back apart I found the second stage cylinder is a straight rod that has a larger coupler pined to it with a 5/32” spring pin (roll pin) the pin had seared allowing the holes for the pin to move into and beyond the stop in the retaining nut. The O-ring set deep into the nut I never saw this the pin was dragging hard enough on the coupler the coupler never came off and when you used your hand to retract the cylinder the coupler moved back onto the shaft where it was supposed to be.
Notes in case someone does a search for this jack
Seal kit # Li240520
Tools and Hydraulics INC 423-622-8282
Cut o-ring
Gap in cylinder to stop sleeve allowing the cylinder to go into and past the o-ring
In the position it should be in
I painted it IH 2150 Rouge red : )
The base was full of rust and Teflon tape from previous attempts to seal the pump circuit’s cap/nuts. Cleaned it up all looked good installed new 0-rings, all the O-rings matched up to off the shelf basic standard O-rings. It worked right off the bat once I got the second stage fully extended I applied a generous amount of hand pressure to the pump peddle as then all of a sudden it puked oil out the top retaining nut for the second stage cylinder. I pulled it apart the O-ring looked good so I tried a harder O-ring I had the same issue now it was cutting the O-ring. At first I thought it used some exotic O-ring I would never find I had the O-ring grove measured it fell into a odd size for the application. I then set out to make a custom O-ring all was good BUT it also cut the one I made.
Then it hit me somehow the second stage cylinder was cutting the O-ring when it maxed out. I took it back apart I found the second stage cylinder is a straight rod that has a larger coupler pined to it with a 5/32” spring pin (roll pin) the pin had seared allowing the holes for the pin to move into and beyond the stop in the retaining nut. The O-ring set deep into the nut I never saw this the pin was dragging hard enough on the coupler the coupler never came off and when you used your hand to retract the cylinder the coupler moved back onto the shaft where it was supposed to be.
Notes in case someone does a search for this jack
Seal kit # Li240520
Tools and Hydraulics INC 423-622-8282
Cut o-ring
Gap in cylinder to stop sleeve allowing the cylinder to go into and past the o-ring
In the position it should be in
I painted it IH 2150 Rouge red : )