Posted by Paul J. on March 20, 2011 at 18:05:23 from (97.114.49.157):
I bought a IH 444 gas last fall with a Westendorf loader. According to the serial number, I think it is a 1970 model. It had been sitting in a barn for 10 or 15 years with minimal use prior to my purchase. We changed all of the fluids, but did not drain the loader cylinders, and we did not changed the hydraulic filter or clean the screen.
We used it regularly all winter to plow snow. (approximately 12 times for 30 to 45 minutes each time) Hydraulics worked fine over each of those uses.
The hydraulics worked when I shut the tractor off a week ago, and today when I started the tractor I had nothing in the way of hydraulics, 3-point or power steering.
In looking at the book schematics and tracing the lines on the tractor; It appears that I have a screen filter in the hydraulic reservoir under the seat and a canister filter under the steering counsel. The hydraulic pump is on the right side of the tractor under the distributor. In addition to the 3-point I have one set of original equipment remotes.
After market there has been a t pipe plumbed into the pressure line coming off the pump. That T in the line feeds the 2 loader control valves.
I need some direction on where to start looking for problems. Possible ideas I have come up with but I have not tore into the tractor yet;
1) The screen filter under the seat has became plugged
2) The canister filter under the steering column is plugged
3) There is a valve, preasure regulator or some other connection that is not closing or not opening properly.
4) The hydraulic pump has spontaneously quit.
5) The drive gear on the pump has broken or a key sheared off.
Does anyone have any ideas on where to logically start looking for a solution? Is there an idea that seems most likely given that it seemed to be working fine when I shut it off and it is not now when I started it?
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