John Deere 790 front loader problem

[conesville]

I have a John Deere 2007 790 with a John Deere 300 cp loader 61" and all of a sudden the loader will not tilt more than an inch. The transmission and the power steering works and the raising of the bucket works. The fluid reads full and no signs of leaks. I tried removing and putting hoses back but still no change. The selector switch is not locked for any movement either. Any suggestions on what else to check?

 

[TBN Support]

Welcome to the forum.

That sounds like a problem! I'm going to move your thread on over to the John Deere section to see if we can find you some advice.

 

[zzvyb6]

One of the bucket curl lines may be blocked. Failed hose, connector not fully inserted into the coupling, bent tube. Try switching the lift and curl circuit hose lines to see if the problem moves with the change. If you've now lost lift, then the problem is in the tractor lines. If bucket curl is still a problem, its in the loader. By any chance is the tractor parked outside and ice has formed in the hoses somewhere ?

I suppose you could just open the lines by removing the connector and streaming some oil into a bucket to see if there is flow.

 

[conesville]

Thanks for the reply.
I already disconnected and put back the quick connect on the selector control side. I do not see any bent lines. I will try to switch the hoses to see if the problem follows the hoses. But if it does could maybe the selector switch have a problem in it self that it is working only in the one direction? Do you know if those selector switches are made in a way that it is even possible to fail in one direction. It is not in any of the locked positions.
What could actually break down and the loader itself? It is greased! The piston maybe? Odd that it moves only by about an inch or so!

 

[conesville]

Welcome to the forum. That sounds like a problem! I'm going to move your thread on over to the John Deere section to see if we can find you some advice.

Thanks Catherine I am new to site. How do I even select a forum to write into it. I only was able to write the original in my profile page., I looked everywhere on site and nowhere do I see where to select and write into the forums .

 

[pmsmechanic]

I just want to see the eventual solution to this problem.

 

[sixdogs]

I have a 790 TLB and there is a "lockout" lever on mine over by my right knee. if you bump it or knock it off just a little, it locks a portion of the loader function. I recall it prevented tipping the bucket more than an inch or so. Mine looked OK but it was locked just a little bit. It's worth a look and I hope this isn't what you mean by "selector" switch.

 

[Zebrafive]

Do either of your hoses have an adapter between the hose and coupler? Normally you only see this adapter on the boom/lift cylinder hose for lowering the boom. The adapter is used to house an orifice to slow the lowering rate. It could have been installed on the wrong hose and if so it could be plugged.
I would do as zzvyb6 suggests; swap the bucket hoses with the lift hoses at the quick couplers.

 

[conesville]

Six dogs the lockout on the selector was the1st thing I checked and that does not seam to be the problem.

 

[conesville]

Do either of your hoses have an adapter between the hose and coupler? Normally you only see this adapter on the boom/lift cylinder hose for lowering the boom. The adapter is used to house an orifice to slow the lowering rate. It could have been installed on the wrong hose and if so it could be plugged. I would do as zzvyb6 suggests; swap the bucket hoses with the lift hoses at the quick couplers.

Zebrafive. Neither of the hoses have an adapter that I see. I do see a dial on the tractor that states turn to slow down. I thought that was for the rear ptu. I already tried to turn it and does not seam to work anything.