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Have you checked the steering knuckles (spindles)? My M4000 locked up and I assumed it was booster or pump. I disassembled the complete system. It was the right front wheel knuckle. would not rotate. Still have not freed. I have it on a 12 ton press and still haven't been able to free.

It is a 1981 Kubota M4000, S/N 11913, I have all operators manual, parts list (english/japanese), workshop manual. I bought it in 1994 with 2000hrs on it and have put almost 1000 hours since then. It has a Bushhog QT 2400 FEL and oversize tires front and rear. It's been a pretty good tractor for...

I removed pump and the PS rotates with implement pump. I replaced both maybe 10 years ago for similar issue and the input shaft on the PS was worn to point there was no engagement with the implement pump. BUT, I just disassembled pumps and see that the cavity between the two is filled with oil...

My PS is out. The pump seems to be fine so I'm left with booster. Anyone have insights into issue? I have workshop manual and there is nothing on PS trouble shooting....thanks in advance