M4500dt hydraulic problems

[mtn man]

I have a m4500dt, given to me by father in law. The 3pt arms won't lower, it is not the lowering control valve, nor the remote spool valves stuck open. Just wondering if anyone had any thoughts, also there is an inspection/adjustment under the seat, through a port covered with a rubber plug. I am curious what this adjustment is, and what it should be adjusted to. Thanks, chris

 

[North Idaho Wolfman]

I would suggest investing in the WSM as it will have the answer on what it adjusts.
That tractor has a unique three point set up and doesn't match newer setups.

 

[JohnDB]

I have a m4500dt, given to me by father in law. The 3pt arms won't lower, it is not the lowering control valve, nor the remote spool valves stuck open. Just wondering if anyone had any thoughts, also there is an inspection/adjustment under the seat, through a port covered with a rubber plug. I am curious what this adjustment is, and what it should be adjusted to. Thanks, chris

PM me - I can help with the manual.

 

[Kubota Newbie]

Make sure the hydraulic response speed valve under the seat is in the position for the fastest response. On my 4500 it doesn't have to be adjusted much toward the slow side before they won't lower with no load on the arms.

 

[mtn man]

Make sure the hydraulic response speed valve under the seat is in the position for the fastest response. On my 4500 it doesn't have to be adjusted much toward the slow side before they won't lower with no load on the arms.

I'll double check it, but it won't lower no matter where the speed valve is. My father in law may have made some adjustments to make the 3pt stay up, he used the old tractor as a log loader in the timber years ago, had some ballast on the back end for the fel

 

[North Idaho Wolfman]

He could have removed some of the linkage?

 

[mtn man]

He could have removed some of the linkage?

Nothing is removed as far as I can teĺl, but it's hard to say what he may have adjusted. He's a heck of a good guy, but not much of a mechanic, haha

 

[mtn man]

PM me - I can help with the manual.

Id be very interested, not sure how to pm you

 

[mtn man]

Make sure the hydraulic response speed valve under the seat is in the position for the fastest response. On my 4500 it doesn't have to be adjusted much toward the slow side before they won't lower with no load on the arms.

I’ve got it wide open, tried it every which way, no change

 

[Russell King]

Id be very interested, not sure how to pm you

Go up to the post fro @JohnDB and click on his na on the left side, then select “start conversation” and you will be private messaging (PM)

I think you can also click on the orange name in thi post

 

[JohnDB]

Go up to the post fro @JohnDB and click on his na on the left side, then select “start conversation” and you will be private messaging (PM)

I think you can also click on the orange name in thi post

Yip, thanks Russell, he now has access to the manual.

 

[mtn man]

I have a m4500dt, given to me by father in law. The 3pt arms won't lower, it is not the lowering control valve, nor the remote spool valves stuck open. Just wondering if anyone had any thoughts, also there is an inspection/adjustment under the seat, through a port covered with a rubber plug. I am curious what this adjustment is, and what it should be adjusted to. Thanks, chris

So after getting the manual, and testing a little, I tore the cylinder off and disassembled the control valve and piston/cylinder. It was all froze up solid with years of accumulated crud, caused by never using the 3pt hitch. Cleaned er all up, put it back together and it works like a champ. Thanks for all the help and info!!

 

[Russell King]

So after getting the manual, and testing a little, I tore the cylinder off and disassembled the control valve and piston/cylinder. It was all froze up solid with years of accumulated crud, caused by never using the 3pt hitch. Cleaned er all up, put it back together and it works like a champ. Thanks for all the help and info!!

That is excellent news.

I think I would consider changing all the hydraulic fluid and filters. Also the engine oil and filters and the air filter.

Then you will know when they were changed, unless you can find out from the father in law