PrindelCreek
New User
Hello,
We have a 4020 with intermittent hydraulic chatter. I have just started working on it but the problem has been worked by a few people first.
The tractor is a late model with the side console and syncro-range transmission. It is used to operate a JD 158 loader from time to time. We do not have the loader installed now though.
When it is acting up I hear the pump chattering but also hear chatter near the steering wheel. The front pump was already replaced and pressure adjusted. The new pump was actually a rebuilt one, but with a new housing. The control valves were all rebuilt. The work was done by a professional, not by us. It should theoretically be good, and no longer part of the problem.
I checked the pressure from the transmission pump. It maxed out at 140 PSI, I don't have a flow meter or I would have checked the flow. The manual said to remove the transmission filter cover and filter, crank the engine, generous amounts of fluid should flow out of the filter housing. I got nothing with it cranking, but when I start the engine it pours fluid out like it should. I have not cleaned the sump screen yet. I wasn't sure if not flowing when cranking was a problem or not so I checked the pressure at the priority valve, just after the front pump. It sits at 2250 when the tractor is running at idle, just like it should. As I am operating things, even the front loader, the pressure stays relatively constant. As long as I keep the RPMs around 1900. When the tractor starts it's chatter the pressure drops down to around 500 PSI. It'll start to chatter with the clutch in or out but it does it more when the clutch is depressed. To stop the chatter I can wait it out or sometimes just give it more RPM's
I have already found that the brake valve is leaking. For troubleshooting I have taken that out of the system. Removing the brake valve made the tractor run much much better. It does the chatter much less, this makes me think I need to hunt for more leaks.
Where should I head next? Does it seem like there may be a problem with the trans pump? 140 PSI seems plenty, doesn't it? It just doesn't flow when cranking. Is it worth buying a flow meter for testing? I was quoted $160 for one I can add to my manifold. That's a lot for just the one test.
Any pointers would be greatly appreciated.
Thanks
We have a 4020 with intermittent hydraulic chatter. I have just started working on it but the problem has been worked by a few people first.
The tractor is a late model with the side console and syncro-range transmission. It is used to operate a JD 158 loader from time to time. We do not have the loader installed now though.
When it is acting up I hear the pump chattering but also hear chatter near the steering wheel. The front pump was already replaced and pressure adjusted. The new pump was actually a rebuilt one, but with a new housing. The control valves were all rebuilt. The work was done by a professional, not by us. It should theoretically be good, and no longer part of the problem.
I checked the pressure from the transmission pump. It maxed out at 140 PSI, I don't have a flow meter or I would have checked the flow. The manual said to remove the transmission filter cover and filter, crank the engine, generous amounts of fluid should flow out of the filter housing. I got nothing with it cranking, but when I start the engine it pours fluid out like it should. I have not cleaned the sump screen yet. I wasn't sure if not flowing when cranking was a problem or not so I checked the pressure at the priority valve, just after the front pump. It sits at 2250 when the tractor is running at idle, just like it should. As I am operating things, even the front loader, the pressure stays relatively constant. As long as I keep the RPMs around 1900. When the tractor starts it's chatter the pressure drops down to around 500 PSI. It'll start to chatter with the clutch in or out but it does it more when the clutch is depressed. To stop the chatter I can wait it out or sometimes just give it more RPM's
I have already found that the brake valve is leaking. For troubleshooting I have taken that out of the system. Removing the brake valve made the tractor run much much better. It does the chatter much less, this makes me think I need to hunt for more leaks.
Where should I head next? Does it seem like there may be a problem with the trans pump? 140 PSI seems plenty, doesn't it? It just doesn't flow when cranking. Is it worth buying a flow meter for testing? I was quoted $160 for one I can add to my manifold. That's a lot for just the one test.
Any pointers would be greatly appreciated.
Thanks