L4610 HST no hydraulic pressure to the loader

[Ricktech]

Hello all. I just acquired an L4610 that had been abandoned for 7 years outside in a field. It had no hydraulic pump, and the loader had been removed and left aside.
I’ve been cleaning it up for the last couple of weeks and installed a new pump and many new hoses have been replaced.
I replaced all the filters and have changed all the fluids. The machine fired right up with the new battery and runs well and steers well. I have removed the relief valve and cleaned it and the screen filter in the case. I just don’t seem to have any pressure at the control valve?? Original owner said the loader worked fine when he pulled it apart except the old pump leaked fluid.
Any advice would be welcome. I am a stubborn old fart and I hate it when I can’t figure things out. Thanks in advance for your thoughts… Ricktech

 

[TheOldHokie]

Its a simple hydraulic system. Start by checking pump output.

Take the inlet hose off the loader valve and stick it in a bucket. Start the engine and you should get oil flowing into the bucket. Immediately shut the engine off or you will pump all the oil out.

If you did not get oil either the pump is not working or you have the plumbing mixed up.

Dan

 

[Russell King]

One pump for external hydraulic power and steering both or two pumps involved?

I have no idea on that tractor, but you mentioned that the steering is fine.

If Dan’s test results in no flow out of the hose you might investigate if the pump is being driven from the engine properly or if the drive from the engine is broken or not meshed with the pump input shaft. (Assuming the pump is mounted on the engine).

 

[TheOldHokie]

One pump for external hydraulic power and steering both or two pumps involved?

I have no idea on that tractor, but you mentioned that the steering is fine.

If Dan’s test results in no flow out of the hose you might investigate if the pump is being driven from the engine properly or if the drive from the engine is broken or not meshed with the pump input shaft. (Assuming the pump is mounted on the engine).

If no flow first thing I would check is to see if the selector valve on the hydraulic outlet block is in the loader position. If it is I would then verify the hose is connected to the pump port on the outlet block.

Dan

 

[Ricktech]

If no flow first thing I would check is to see if the selector valve on the hydraulic outlet block is in the loader position. If it is I would then verify the hose is connected to the pump port on the outlet block.

Dan

View attachment 143606

I’ll check out the outlet block first thing in the morning. Thanks for the info

 

[Ricktech]

I’ll check out the outlet block first thing in the morning. Thanks for the info

Well. You sure earned my thanks on that suggestion. I had no idea about the select valve. I’m a happy owner now! Also on the bright side, I was able to repair several other potential issues while trying to sort out the hydraulics. Thanks again

Ricktech

 

[TheOldHokie]

Well. You sure earned my thanks on that suggestion. I had no idea about the select valve. I’m a happy owner now! Also on the bright side, I was able to repair several other potential issues while trying to sort out the hydraulics. Thanks again

Ricktech

Its amazing what you can learn by reading the owners manual

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3010%20L3710%20L4310%20L4610%20Owners%20Manual.pdf

Dan

 

[Ricktech]

Yes it is.. and now I have one
Thanks

 

[North Idaho Wolfman]

Yes it is.. and now I have one
Thanks

Do you have the WSM (aka Service manual) ?

 

[Ricktech]

Do you have the WSM (aka Service manual) ?

 

[Ricktech]

Sadly no I do not

 

[TheOldHokie]

Sadly no I do not

The WSM can also be downloaded from Kubotabooks.com. it is divided into two separate files - Part 1 and Part 2.

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3010%2CL3410%2CL3710%2CL4310%2CL4610%20WSM%20Part%201.pdf

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3010%2CL3410%2CL3710%2CL4310%2CL4610%20WSM%20Part%202.pdf

Dan

 

[Ricktech]

The WSM can also be downloaded from Kubotabooks.com. it is divided into two separate files - Part 1 and Part 2.

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3010%2CL3410%2CL3710%2CL4310%2CL4610%20WSM%20Part%201.pdf

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3010%2CL3410%2CL3710%2CL4310%2CL4610%20WSM%20Part%202.pdf

Dan

Downloaded and printed!