JD 6410 1 2 3 work fine 4th is slipping in partial power shift??

[fatdaddyfarmer]

Any help on what to look for or how to repair would be greatly appreciated!!

 

[JD6400NZ]

Bent gear rod, Bad syncros ?

 

[Tx Jim]

I would think that there are hyd ports to check pressures to aid in diagnostics.

 

[fatdaddyfarmer]

Bent gear rod, Bad syncros ?

( Thanks JD6400NZ) The Quad range part of the transmission all four ranges A B C n D are working fine just 4th in the power shift portion of the transmission when in any of the 4 ranges is the problem. Also can the power shift part of this transmission be repaired or removed which ever might be needed in this case without splitting the tractor. Thanks again to all.

 

[Zebrafive]

I would think that there are hyd ports to check pressures to aid in diagnostics.

There are. Two, one for lube pressure and one for system pressure.

 

[Zebrafive]

( Thanks JD6400NZ) The Quad range part of the transmission all four ranges A B C n D are working fine just 4th in the power shift portion of the transmission when in any of the 4 ranges is the problem. Also can the power shift part of this transmission be repaired or removed which ever might be needed in this case without splitting the tractor. Thanks again to all.

This is a full frame tractor, so it is not split. If open station the plat form must be removed, if a cab tractor the cab tilted rearward. Then the PQ trans can be removed.

 

[Zebrafive]

Have you checked for error codes. Your Owners Manual should tell how to do this. Post error codes.
It might be a shift valve is stuck for the 3-4 shift.

 

[fatdaddyfarmer]

Have you checked for error codes. Your Owners Manual should tell how to do this. Post error codes.
It might be a shift valve is stuck for the 3-4 shift.

I don't have a owners manual ,didn't buy tractor new, but I will get one ,sounds like an excellent place to start

Thanks again to all

 

[JD5210]

Check this JD site to see if there is an online manual you can look at.

John Deere Ag - New Equipment: Technical Publications - Equipment List

 

[fatdaddyfarmer]

Tried to get error codes I think there are none, although my display is not working perfect either, did buy a repair manual on cd but it has no diagnostic section of course, that is a different manual I will try and get one of those and keep you posted. The way it looks 1 2 3 go through the planetary and 4th is direct drive or engine rpm so I don't know what the problem is.

 

[Zebrafive]

Tried to get error codes I think there are none, although my display is not working perfect either, did buy a repair manual on cd but it has no diagnostic section of course, that is a different manual I will try and get one of those and keep you posted. The way it looks 1 2 3 go through the planetary and 4th is direct drive or engine rpm so I don't know what the problem is.

Which manual did you get? TM4572 or TM4574?
Although 4th gear is direct drive it is achieved by locking together the second and third gear sun pinion gears. So there is a 4th gear clutch in the Power Quad transmission.
The Power Quad has a built in oil pump. If 1st, 2nd and 3rd work OK, I think the pump is OK, but there is a port to check it's pressure. The engagement pressure should be 170psi.
There are also shift valves and the valve(s) could be not fully shifting or leaking.

 

[fatdaddyfarmer]

Which manual did you get? TM4572 or TM4574?
Although 4th gear is direct drive it is achieved by locking together the second and third gear sun pinion gears. So there is a 4th gear clutch in the Power Quad transmission.
The Power Quad has a built in oil pump. If 1st, 2nd and 3rd work OK, I think the pump is OK, but there is a port to check it's pressure. The engagement pressure should be 170psi.
There are also shift valves and the valve(s) could be not fully shifting or leaking.

I now have both of the manuals, the engagement pressure is 170 so the pump is fine. when I shift from 3rd to 4th it pulls some but able to stop the tractor with the brakes, also when the tractor is in 4th it does not speed up, it moves at 3rd gear speed. also can the shift valves be removed without removing the transmission or can you remove the shift valve housing and then pull out the shift valves?

Thanks for all the help ,Randy

 

[Zebrafive]

Not sure if valves can be removed without removing the shift valve housing. It's on the bottom of the trans. In TM4574 see page 55-10-7 it shows the shift valve housing. page 55-10-23 has removal instructions. Page 55-10-26 show the valves. Key D B3-C4 shift valve is for 3rd to 4th gear shift and the one that might be sticking. If it's Ok then it might be the clutch pack.

 

[fatdaddyfarmer]

Ya I looked at tractor pretty sure valve housing will have to be removed to get out shift valve. workin on second crop hay now when I get some time I'll pull housing hopefully shift valve is the problem, not sure if I could handle clutch pack myself.

 

[bigblock]

I was thinking clutch when I read the title. Clutch slipping problems usually start showing symptoms in high gear.

 

[Zebrafive]

If not a shifting valve problem, I think it's the fourth gear clutch pack, not the main clutch.

 

[fatdaddyfarmer]

Finally removed shift valve housing, did not find any problem there, everything looked good. Probably a clutch pack.