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#1
11-10-2019, 06:06 PM
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Help with 129 hydro!
Hello all! First off I want to thank you all for the knowledge you have shared. So far I have been able to search and solve all kinds of things on my new to me 129. However, I have a new issue and even after searching I can't seem to come up with what is going on.
I was backing the tractor out of the shed and the ramps I was using broke and it dropped down a foot or so and got hung up on the deck. I had to use a floor jack to raise the back end enough to get it back onto a new board and was able to use the hydro lever to back it the rest of the way out. When I went to move forward there was a loud grinding sound (which I have never heard before). Afterwards the lever went completely loose and had no resistance when trying to move forward or reverse and it would no longer move. I also have hyrdo lift which is now no longer operating either. The pin where the shaft meets the pump doesn't appear to be sheared. I pulled the seat/body off and when I spin the shaft by hand it is also turning on the rear of the pump. I am new to hydros and what I do know I have learned from here. When I move the hydro lever on the steering wheel the linkage all moves and moves the shaft on the side of the hydraulic pump, but it is all completely loose and offers no resistance. When I push the lever to the forward drive position all the way it will just start to creep forward, nothing in reverse. I knew my check valves were sticking. I thought maybe when it slammed down it caused them to stick down so I pulled them, soaked them in PB blast and they seem to work pretty well. One is still a little sticky, but I'm not sure how else to free it up. What else could it be?! We are supposed to get our first snow next week and I'd really like to get the plow hooked up and working before I need it this winter. 
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#2
11-10-2019, 07:38 PM
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You need to have the engine running with the driveshaft turning the pump to have both movement and lift.
It seems plausible that the spirol pin for the pump (rear) has sheared. Just because you can turn it by hand doesn't mean it isn't broken. The "ragged ends" of the broken spirol pin may be causing enough resistance that it seems OK moving by hand but may be slipping under engine power. You need to look underneath to see if the shock of dropping broke any other parts. Check all the pivots where the hydro lever moves the linkage. EDIT Adam's suggestion below is spot on.
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#3
11-10-2019, 07:41 PM
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Check the suction tube at the bottom front of the rearend. Maybe you crushed the tube when it fell.
__________________
Adam 1964 Model 100 w/ K301 12hp and custom hydraulics 1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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#4
11-10-2019, 08:13 PM
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Pics and videos
Thanks all, I went out and took a few videos to hopefully help.
Video of shaft rotating before pump Video of the rear of the pump shaft turning with motor running Video of linkage moving with motor running Video of linkage with up close detail with motor off I also checked the tube below and it is fully shaped and doesn't appear to have taken a hit. Fluid is filled to the fill plug in the rear as well.
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#5
11-10-2019, 09:02 PM
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Oh I don't know but maybe you broke something inside..... That's rare! Very rare.... !
Maybe broke an axle? Jack the rear up and spin both tires forward and back. The other tire should go the opposite direction with little slack.
__________________
Two 125's and a 124 all with 42" decks Plow blade #2 Cart QA36 snowthower
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