7308 Loader Problem

[snikers01]

I have a tc33 with a 7308 loader, the tilt down is seized up, it will good up curl back to not curl down. Has anyone fixed this issue. I have never had a control valve apart.

 

[5030]

Sure you don't have dry pivot pins?

 

[dusty3030]

Make sure hydraulic quick connections are fully seated.

 

[dieselscout80]

I went through a similar situation but with lowering the loader boom. It wouldn’t lower except for when I put it in the float position.

When I call the valve manufacturer Prince they said that the couplers could be the problem. However, I swapped the lines to lift the boom with the bucket till lines. When I did that the issue followed the boom lift lines that were then on curl cylinders and I could NOT move the bucket in one direction (added for clarity).

I had to replace the valve to fix it.

 

[snikers01]

Has anyone ever taken the control valve apart?

 

[dieselscout80]

I went through a similar situation but with lowering the loader boom. It wouldn’t lower except for when I put it in the float position.

When I call the valve manufacturer Prince they said that the couplers could be the problem. However, I swapped the lines to lift the boom with the bucket till lines. When I did that the issue followed the lift lines.

I had to replace the valve to fix it.

I left out switching the lines (in pairs) is a great way to know if the valve is the issue. If the problems follows the lines it’s the valve. If it doesn’t then it another issue.

 

[dieselscout80]

Has anyone ever taken the control valve apart?

Prince said there’s nothing rebuildable in my valve.

 

[John_Mc]

I left out switching the lines (in pairs) is a great way to know if the valve is the issue. If the problems follows the lines it’s the valve. If it doesn’t then it another issue.

Maybe I'm just not following your description, but if the problem follows the lines, doesn't that mean it's not the valve? If curl down is not working and he switches those lines to the lift function on the valve and the curl down still does not work, the problem has followed the curl lines, indicting that it was not the curl section of the valve that was causing the issue.

 

[dieselscout80]

If one has two circuits #1 and 2 and number one is on valve number one and two is on valve two. If you move the lines from one to valve two and the issue goes with the lines the valve is the same and so it is the issue.

Think of it this way valve one is the boom lift circuit and valve two is the bucket curl circuit. In the move the lift valve will control the curl and the curl valve will now control the curl cylinder(s).

 

[WM75Guy]

Like others have said I would disconnect, clean, and reconnect the lines. If it persists, I would swap the lines to determine if it is the valve or some other issue such as a bad hydraulic line or cylinder. It looks like the valve is not serviceable and NH has discontinued the valve, but maybe Messick's has another source if it is the valve. That valve fits 19 models so you might also find one in a tractor salvage yard.

 

[John_Mc]

If one has two circuits #1 and 2 and number one is on valve number one and two is on valve two. If you move the lines from one to valve two and the issue goes with the lines the valve is the same and so it is the issue.

Think of it this way valve one is the boom lift circuit and valve two is the bucket curl circuit. In the move the lift valve will control the curl and the curl valve will now control the curl cylinder(s).

But in that example the issue moved with the lines, it didn't stay with the valve. If the issue is with curl not working and you move he curl lines to another valve and the bucket still won't curl, the the issue has moved with the lines, not stayed with the valve.

 

[dieselscout80]

Yes it did meaning the same valve had the issue with both sets of cylinders so the valve is the common denominator and is the faulty part.

Also the fault now is happening on the other set of cylinders.

 

[WM75Guy]

Yes it did meaning the same valve had the issue with both sets of cylinders so the valve is the common denominator and is the faulty part.

Also the fault now is happening on the other set of cylinders.

Good news is the valve for the TC45DA is still available, Messick's has 1 in stock. Bad news is it is $1201.96. The valve can be rebuilt according to the parts diagram, there was a complete kit available at one time. Some of the individual parts are still available.

 

[dieselscout80]

Yes the TC45DA is available I just bought one this year.

When I replaced it I asked about the repair kit but it is the detent parts. If the valve spool(s) or body is worn it’s replacement valve time.