John Deere 4410 e-Hydro issue (maybe)

[Daves_Farm]

Hello, long time member, just haven't been around much. I recently purchased a 2002 John Deere 4410 e-Hydro trans. It has the 430 loader on the front and a 48 backhoe on the rear. The problem I'm having is that I get no forward or reverse drive until I have the RPMs up around 1500 or higher. Below that, there is nothing. Loader and backhoe both operate fine at the lower RPMs. Another thing I have noticed is that when I'm driving at around 1500 RPMs, steering will cause the tractor to slow down. A full fluid/filter change was recently done on the tractor, with nothing out of the ordinary noticed in the fluids. When driving, it seems to have plenty of pulling power, just not anything at lower RPMs.

Wanted to get some opinions before I started really digging into it. I've seen some threads that mention charge pressure, but wasnt' sure if that was the right direction to head. Any help or suggestions would be greatly appreciated.

Thanks,
Dave

 

[mddorange]

:welcome:
To the TBN forum Dave. Glad you finally are letting us know you are here.

I can't help with that problem but someone on here will be able to shortly.

 

[GhostWriter]

Does the return line at the hyd pump collapse, or partially collapse? It may be as easy as cleaning the pre-filter screen.

 

[beenthere]

Daves_farm
Did you clean the sump screen when changing fluid/filter ? as already mentioned..

Also, are all the e-buttons in the correct position ??

 

[Daves_Farm]

Sump screen was cleaned. I haven't looked to see fi the return line is collapsing, but with the screen cleaned out, I'm guessing that's not going to be the case. I'll check this afternoon after I replace one of the hydraulic lines on the backhoe, decided to take a hydraulic fluid shower the other day.

 

[mike48130]

How many hours? Is the hydraulic oil foaming? The power steering, 4x4 cylinder and the hydro trans are all fed from the front pump. The rear pump feeds thenloader, 3pt and backhoe.

The oil goes thru the power steering valve before it feeds the hydr trans.

Might have a bad front pump. There is a solenoid valve on the right side under the operator station that has a test port. Pressure should be at 175 psi.

If you are getting foaming oil you have an air leak on the suction line.

 

[Daves_Farm]

Tractor has right at 500 hours. There is no foaming of the hydraulic fluid that I have seen either before or after fluid change. I'll have ot see if I can get a test set put together to check the pressure at that location. Forgot to add that when it is moving, it does have a whine to it, not sure if that will help with internet diagnosis.

Thanks for your help.

Dave

 

[mike48130]

What gear is it in? If you have it in C it might do that. Move bit to Aand see what it does. Try it in N and see if it still whines. Is parking brake off? Sounds like it is over loaded somehow.

 

[Daves_Farm]

Does it in all three ranges, A,B, and C. Parking brake is off. No noise at all in N. At lower RPMs, there is no whine at all, even though the tractor isn't moving.

 

[mike48130]

Lift the rear end and check if the rear tires rotate. You should be able to rock them. I assume you are in 2wd. If not try again to eliminate the front drive.

These tractors are know for the brakes locking up. The seal on the brake shaft is far in the housing and it corrodes. Several threads here on that.