Broke by Model 48 Backhoe

[MMH]

Perhaps stating the obvious, but the linkage is all attached and working? Any fluid leaks?

No fluid leaks and all linkages OK. Not stating the obvious at all. I would be embarrassed to admit how many times I did things the hard way because I overlooked the obvious.

 

[texasranger556]

Before pulling the valve out, I'd pull a line off at a swing cylinder or the output of the valve to verify the valve is at fault.

Sisupower sounds like he's dealt with a similar problem before so you're probably headed in the right direction if you already started pulling the valve.

 

[MMH]

it was a broken cylinder. The nut that holds the piston to the rod totally backed off and then the piston came off. Actually the nut backed off until it was only on by two threads which then sheared. There was plenty of blue loctite on the threads so either the nut was not properly torqued, or oil/grease was still on the threads when the loctite was put on. I cleaned up the ends of the threads & chased them. All other parts (seals, piston, etc.) seem OK. So I am going to reassemble & assume that all will be OK. Even if it is not, I have nothing to lose - no parts just my time. I will properly degrease, apply loctite liberally, and torque the s**t out of it!

 

[sisupower]

Good!!

 

[texasranger556]

I guess that makes sense, the oil would have a direct path through the center of the piston so no restrictions at all.

On my loader one of the bucket cylinders was leaking and allowing the bucket to dump by itself in about 20 seconds. Since both cylinders are tee'd, it's not obvious which was leaking. If you dump the bucket all the way, disconnect the retract hose on the right cylinder (or left, up to you), then with the tractor running try dumping slowly. If oil comes out the hose, it's the left cylinder, if it comes out the cylinder port it is the right cylinder that needs rebuilt. Could use a similar method to troubleshoot parallel swing cylinders.

Glad you found the problem!