When I was mowing the pasture in 100 degs temp, the radiator became
plugged with debris and the tractor overheated. When I noticed the problem,
I let the tractor idle for a half hour before shutting it down. But apparently
it had been overheating for several hours before I caught it.
The next day when I went to use the tractor, the hydraulics are now
very weak. I have to run the engine at 2000 rpm just to lift the front
loader bucket up --- plus it stutters. And the hydraulic power steering
also has the same stuttering and weakness. The hydraulics worked just fine
even at idle speeds previously. I could even steer it just fine at idle previously.
Now it has to be running at 2000 rpm just to begin to be able to
turn the wheels plus lifting the bucket is very labored with the same stuttering.
Had anyone worked on the hydraulics for the Kubota L3940HST?
It was time to replace the fluids on the tractor anyway so I replaced all
of the fluids --- engine, radiator, front axle, 11 gallons super UDT in the hydraulics.
All with no help at all. Its still very weak hydraulics that stutter.
There is only 420 hours on this 2009 L3940HST with never a
problem previously. Anyone have an idea as to what the overheating might have caused? Is it possible for both hydraulic pumps to become defective from overheating or is this more of a problem with the hydraulic valves? I've never worked on hydraulics before.
The nearest tractor service center is a 250 mi drive so I'm hoping to fix it myself.
The only thing I've seen out of the ordinary after it overheated is the short length of hose attaching to the inlet to the power steering hydraulic pump has a stress fracture and leaks a small amount of fluid. When I drained the fluids they all looked ok.
Anyone have any ideas what the overheating has caused to go bad?
I suspect the pumps are still good and that the problem is the control
valves. But I've never done any hydraulic work before.
The engine runs just fine. So the overheating has only effected
the hydraulics.
Frank
plugged with debris and the tractor overheated. When I noticed the problem,
I let the tractor idle for a half hour before shutting it down. But apparently
it had been overheating for several hours before I caught it.
The next day when I went to use the tractor, the hydraulics are now
very weak. I have to run the engine at 2000 rpm just to lift the front
loader bucket up --- plus it stutters. And the hydraulic power steering
also has the same stuttering and weakness. The hydraulics worked just fine
even at idle speeds previously. I could even steer it just fine at idle previously.
Now it has to be running at 2000 rpm just to begin to be able to
turn the wheels plus lifting the bucket is very labored with the same stuttering.
Had anyone worked on the hydraulics for the Kubota L3940HST?
It was time to replace the fluids on the tractor anyway so I replaced all
of the fluids --- engine, radiator, front axle, 11 gallons super UDT in the hydraulics.
All with no help at all. Its still very weak hydraulics that stutter.
There is only 420 hours on this 2009 L3940HST with never a
problem previously. Anyone have an idea as to what the overheating might have caused? Is it possible for both hydraulic pumps to become defective from overheating or is this more of a problem with the hydraulic valves? I've never worked on hydraulics before.
The nearest tractor service center is a 250 mi drive so I'm hoping to fix it myself.
The only thing I've seen out of the ordinary after it overheated is the short length of hose attaching to the inlet to the power steering hydraulic pump has a stress fracture and leaks a small amount of fluid. When I drained the fluids they all looked ok.
Anyone have any ideas what the overheating has caused to go bad?
I suspect the pumps are still good and that the problem is the control
valves. But I've never done any hydraulic work before.
The engine runs just fine. So the overheating has only effected
the hydraulics.
Frank