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Re: TO-35 Hydraulics
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I would rebuild the pump if the majority of it is in good shape. It's not too tough a job and there are good kits available from this website. Having said that, some of the kits include pistons, cylinders and everything you need to make it work like new. While you are at it definitely replace the pressure relief valve, myself and others have done it without replacing it and promptly cracked the lift cylinder or top cover, it's a cheap part so replace it for sure.
The draft lever shouldn't have anything to do with lifting, put it roughly centered and try it but I'm sure you've tried it in different positions. The leakdown time you state sounds pretty typical which would tend to indicate that the hyd. piston and rings etc. are in decent shape. My 35 is pretty worn out and starts to leak down immediately but I'm replacing the pump and lift with the rebuilt one from my 202.
Being as how it is a piston pump I would expect it to be a little jerky at low RPM. The GL1 gear oil is a very thick oil to start with but I have heard it recommended to put in 10W30. I am in the process of rebuilding my TO35 and I plan to put 10W30 in it but I'm up in Canada where we get very cold temperatures. My 202 has the GL1 in it and I wouldn't even dream of using the 3pt in the winter with that, just too thick!
I would replace the O-rings for sure while you have the stand pipe out, it certainly can't hurt and might even solve your problem.
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