1955 To-35 lift problems

ncsu602

New User
Hi, I'm having an issue with my tractor. The lift is slow and jerky but lifts everything and holds it up for hours, just takes a while and RPMS don't really matter. A little background, I bought the tractor last year and went through the hydraulics myself over the winter. It has a brand new pump assembly, newer style 2500psi system with a 2000psi pressure relief valve, new 2.5" piston with single washer and oring, cylinder was in good shape, new o-rings on the stand pipe, pretty much everything new in the hydraulics. It has less than 10 hours on it since then. I took the side cover off and cleaned the filter, it had a little junk on it but not alot, no improvement.

I was using a 6' box scrape this past weekend and running it pretty hard scraping a 1000' driveway that was compacted. There was some larger rocks sticking up and the box scrape bounced around alot. Also there was some softer stuff that would fill the box up, enough that when I'd raise it to smooth everything out it would pick up the front of the tractor. The last pass I made is when I noticed the issue. Any ideas? Bad pressure relief valve? Thanks!
 
The jerky action can only be one thing, pump failure. Usually a broken valve in the pump.

I wouldn't think using the box blade would have had any effect, just a coincidence.
 
Is the fluid the right type
I had trouble a few years ago with it jerking when going up
I changed fluid and it made a big diff.
nice and smooth , I think previous had wrong type in it.
 

Well great....

That definitely helps narrow it down, but narrows it down to the fact that I'm going to have to pull the pump. I was afraid of that, even though I could have the pump out in about 20 minutes (had alot of practice replacing it the first time, didn't line the linkage up right a couple of times). I appreciate the advice!
 

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