Yale N/A:
Help With Valve Body?

Hi all,

First off, sorry for not including the proper Series/ Model, I'm not sure of it, that's one of my problems. From the looks of it it's a '65 model year and it has the Chrysler flat 6 engine in it. Here are a few pictures of it, hopefully you guys can let me know what it is. This is my dad's machine that I work on for him in my spare time. It's only used once or twice a week for a few minutes. He can't justify a new machine so he decided to have me fix this old beast up.

The problem I'm having is that after putting a whole bunch of work into rebuilding the main lift cylinder and getting the engine running right I found that main valve body(not sure if it's the correct terminology) is leaking. Even before getting the rebuilt cylinder in we had a problem with air in the system and I thought it was because of the leaking cylinder. After the rebuilt piece went in I couldn't get the air out and then we discovered another leak. Well it turns out that the spool valve leaks where the plungers(?) are. My dad had this piece rebuilt a few years ago supposedly and they told us that they couldn't do anything about the plungers, we would have to get a whole new unit.

I'll have more questions later on but I'd like to get this resolved first because we can't use it as is. Some more pictures to help identify the unit. Basically what I'm looking for is if this spool valve can be rebuilt, if not where can I get a new one? Everybody in this area seems to be clueless with this machine since it's considered "ancient".

The pictures are in the link to my photobucket account bellow. I tried to direct link them but there getting censored? Please add "http://" to the link bellow.

s261.photobucket.com/albums/ii67/paintballdude05/Yale%20Forklift/

Thanks,
Steph
  • Posted 29 Mar 2011 14:36
  • Modified 29 Mar 2011 15:29 by poster
  • Discussion started by paintballdude05
  • Ontario, Canada
Showing items 1 - 2 of 2 results.
Thanks for the reply,

Is this job very hard to do? He had it rebuilt a couple years ago like I mentioned, is there something that would cause it to go bad that quick? It's not like it's been used a lot, but it might have been ran with not enough fluid.
  • Posted 31 Mar 2011 13:44
  • Modified 31 Mar 2011 13:45 by poster
  • Reply by paintballdude05
  • Ontario, Canada
That looks like a very old (early '60s) G51C. The leaking hydraulic control valve should be fixed by just taking the spools/plungers out and installing new O rings. Air can get in through a leak or bad clamp connection on the suction hose from the tank to the pump.
  • Posted 29 Mar 2011 21:25
  • Reply by mrfixit
  • New York, United States

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