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Hydro 70 Question

R

rustyacresnd

Member
Wondering if anyone has any experience with Hydros and pulling loads. I have a Hydro 70 with a D312. When it's cold it pulls anything the engine can handle, but when it warms up it loses pulling power. It makes a noise as if the pump is cavitating, about like a power steering pump low on fluid. If i ease back on the speed ratio lever it quiets down and pulls again at the lower speed. The fluid is full and the filters have been changed. I have had the tractor for 14 years and it hasn't gotten any worse since I've owned it. I use it for loader work, mostly pushing snow in the winter and as long as I don't have more than an hour's worth of heavy work to do it works fine. Light work it doesn't bother at all. Anybody have any clues or run into this before?
 
First off , make sure the foot-n-inch pedal is not contacting the platform. It has to clear it so valve can be fully seated. Pedal must have good spring and be free. If that is ok, take off the return line fitting from that valve and put tractor under load that makes tractor stop. If oil comes out of that fitting, it means the valve is leaking unless you are reaching max pressure which I would doubt or it would pull. Maybe broken spring in valve. Next test is to cap with steel caps the two fittings coming off top of transmission to control valve. This will eliminate all external causes of problem. You will not have use of the foot pedal then so you would have to be very careful. Unfortunatly, you say it works ok cold, that sounds like worn plates causing lift off when warmed up.
 
Thanks for the advice. Seems to me that the foot n inch pedal does hit the platform but will have to check to be sure. Your statement about the plates sounds reasonable since it happens when the fluid is hot and thin. Again thanks.
 
I gotta ask, are you using hy-tran? Sounds like your oil is foaming and causing the pumps to suck foam instead of oil.
caseman-d
 
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