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kubota L3750 hydraulic problem

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Posted by pete-nj on February 25, 2003 at 18:38:16 from (

I have a Kubota L3750 with hydraulic shuttle transmission, bought it used with about 1400 hours. I serviced it at about 1500 hours, in late summer, changed all fluids, filters, etc. as per service manual. My problem started when I serviced the machine, prior to this I had no problems.
The problem began when I started it and then could not get it to move and the front end loader did not work, basically it had no hydraulics. I thought there might be air in the system, so I pulled a line off the loader, no air in the line. Talked to a kubota mechanic and he gave me some things to try, none of whiched worked. I seemed to think the pump was not pulling any fluid and started to look at a way to "prime" the pump.
I ended up pulling a sensor of the top of the pump and then used a bulb to shoot some oil (about 9 oz.) into the pump. I was careful to clean all dirt off the top of the pump before removing the sensor. This worked and the tractor ran fine. If I would not use it at least once a week or so, I would have to go through the priming process to get it going. Once it gets primed it works strong as it should.
It had been about 2 months since I used it and then we had the big snow storm, 2/16/03, I could not get it going at all. Even after "priming" it with about 20 oz. of fluid, which was not easy in 20 degree weather.
This obviously is not right. Does anyone have any ideas as to what I have to do to fix this? Do I need a new pump? or what. Why would changing the hydraulic fluid (transmission fluid) cause this? I did not notice a lot of metal fillings in the oil or on the magnetic drain plug. Used JD hydraulic fluid at the dealers recommendation.
The fluid has small amount of small air bubbles, but it is not cloudy. The fluid level is all the way to the top of the dip stick.

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