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Discussion Starter #1
Any tips on testing a piston style pump on one of these? I replaced my vane pump and can't get lift on the 3 point now. So far I've replaced the unloader valve o ring and pulled inspected and replaced the pressure valve. now i suspect whoever rebuilt the pump didn't seal it right...
 

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Discussion Starter #3
Hey Bee Catcher, yea I bled the pump with the screw on the side of the pump, thinking now I should have pulled the plug down by the pressure valve too. I'll try more things when I get the new pressure valve in the mail and I can put it all back together...
 

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Discussion Starter #5
I put it all back together with the new pressure valve but still no lift, I still suspect it's the pump itself but havn't had a chance to tear into it yet. Funny you should ask though, my wife was just hollering at me yesterday that she wants her garage spot back ;)

I'll update when I get a chance to tear that pump apart...
 

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Discussion Starter #8
She's been working without the lift for awhile now, only using the loader. Just rebuilt the carb and she runs like a top. I've thrown the towel in on the lift problem. I can't seem to get it figured out. Going to give the boy's down at the tractor shop a shot at this one...Weather guy say's 4 days of rain coming in but I'm way past due for a mowing!
 

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Open the connection on the pressure side of the pump just a turn or fraction of a turn. Just enough for the fluid to seep out, while the engine is running. I think you will see a bubble of air now and then. Let it seep for 2 or 3 minutes and see if the lift doesn't start rising.
 
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Some of those old piston pumps had 2 pipe plugs in the front of the housing, make sure your at the end of the pump (towards the fan) and closest to you. Run a barbed fitting into the threads and some vinyl tubing back to your fill plug. Run it till the air clears out and put the pipe plug back in.
 

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Now that is one I will store in my memory bank. Thanks for posting it. It should save about a week's work and worry after changing a pump.
 

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Discussion Starter #14
Finally got a chance to work on this, I have the 3 point going up and down now, there's still a problem with the remote hydraulics though. They are remotes that sit on top of the cover under the seat, if I move the remote hydraulic lever even a 1/4 inch off center in either direction then the 3 point stops moving. There's a bleed screw on the front of that remote unit that's getting plenty of oil.

I think I may pull the remotes off (I don't use them) and grab a block off plate from the bone yard...
 

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I still say O-rings on the spool valve are worn or broken. Replace them and look for a chip out of the inside of the housing where the spool slides.
 
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