John Deere 245 loader won't rise completely

[T-Hunter]

I have a John Deere 245 loader on a 2755 tractor. Lately, the boom does not go up like it did before. The loader lifts very heavy loads Ok until the back part of the boom is all the way up. Normally, the front part of the boom (forearm) would rise at this point but it does not. The front booms (forearms) no longer go higher than horizontal to the ground. The hydraulic fluid is topped off. I have tried to bleed the lines to the cylinders but only fluid (no air) comes out. Thanks for you input.

 

[Jim.ME]

WE need to clarify what you are asking about. Forearm is not a loader term I am aware of. I labeled a picture of a 245 loader with more common component names for you. Perhaps it will help us understand better if you describe the issue using these terms. If your loader is not like this, please post pictures of it.

The cylinders on these loaders are self-bleeding, you do not bleed them.

Do you have an Operators manual for your 245 loader?

 

[buickanddeere]

Is the bucket fully curled or fully dumped ?

 

[Tx Jim]

Sounds as if a faulty breakaway coupler connection is partially blocking oil flow.

If FEL hyd circuits have any hyd breakaway couplers involved I suggest to lower boom completely then disconnect/reconnect all breakaway couplers associated with FEL.

What type hyd valve controls FEL(ind or scv)?

 

[Jim.ME]

Sounds as if a faulty breakaway coupler connection is partially blocking oil flow.

If FEL hyd circuits have any hyd breakaway couplers involved I suggest to lower boom completely then disconnect/reconnect all breakaway couplers associated with FEL.

What type hyd valve controls FEL(ind or scv)?

From the linked post, he also made yesterday, it looks and sounds like he is using the SCVs to operate the loader. Also, he has installed a diverter valve in a circuit. There may be some relationship between the current issue and the plumbing done for the 3rd function. Or a bad coupler(s) as you mentioned.

JD 2755 3rd Function or Diverter

 

[buickanddeere]

Loaders function better if they have their own dedicated joystick control . Supplied from a T into a high pressure line , after the power steering priority valve . With the oil returned to a ported transmission oil filter cover .
With the grapple or what ever aux function supplied from an SCV . I stead of fooling around with a diverter valve .

 

[Jim.ME]

Loaders function better if they have their own dedicated joystick control . Supplied from a T into a high pressure line , after the power steering priority valve . With the oil returned to a ported transmission oil filter cover .
With the grapple or what ever aux function supplied from an SCV . I stead of fooling around with a diverter valve .

Or a three-function loader valve. They are available as a two-function joystick with a lever for the third or a three-spool, three-lever valve, to eliminate diverter valves and have all the valve controls in the same place.

 

[T-Hunter]

Thank you for all the feedback. I'll try to clarify what I meant. The back segments of the boom rise normally under full load regardless of the curl. When the back segments have risent fully, the front arms should start to rise and the boom should straighten out a bit adding to the overall height. This no longer happens. The diverter has worked and continues to work as it should. I'm attaching a picture of a loader that has the front arms of the boom fully extended. I'm also attaching a photo of my loader. The picture shows my loader as far as it will rise (red line). The yellow line shows about how it used to extend. The problem started after a breakaway coupler came loose and was reconnected. I'll try to play around with the connection to see if that resolves the problem.

 

[Jim.ME]

Thank you for all the feedback. I'll try to clarify what I meant. The back segments of the boom rise normally under full load regardless of the curl. When the back segments have risent fully, the front arms should start to rise and the boom should straighten out a bit adding to the overall height. This no longer happens. The diverter has worked and continues to work as it should. I'm attaching a picture of a loader that has the front arms of the boom fully extended. I'm also attaching a photo of my loader. The picture shows my loader as far as it will rise (red line). The yellow line shows about how it used to extend. The problem started after a breakaway coupler came loose and was reconnected. I'll try to play around with the connection to see if that resolves the problem.

The boom is a solid frame it does not pivot at the right end of your red and yellow lines. The triangle shaped part in the center of the boom, with the rods and bucket cylinders attached to the top of it pivots, it is a self-leveling linkage for the bucket.

I am going to say you just provided the answer to the issue. Since you say it started with a coupler that came apart, It is most likely the coupler that came apart is the issue and is preventing the boom from fully raising. Look at the picture you posted of the other tractor. Do you see how near vertical the boom cylinders and rear of the boom frame is? Yours should look more like that when raised, see the attached picture of a 245 raised higher than yours.

Having too many couplers, is another reason to install a dedicated three-function loader valve and stop using the remotes in my opinion.



Edited to add drawing on the boom.

 

[Tx Jim]

I'm curious what type valve controls grapple?? I'll guess a breakaway coupler that's not seated correctly is limiting boom height.

 

[Jim.ME]

I'm curious what type valve controls grapple?? I'll guess a breakaway coupler that's not seated correctly is limiting boom height.

In the post I linked, in post #28, he posted " I installed a Summit diverter on the curl circuit downstream from the pressure relief vavle located on the boom."

In post #8 here, he posted the problem started when a breakaway coupler came apart and was reconnected. I think you had the answer in post #4.

 

[T-Hunter]

Thank you for explaining how the boom functions. I'll try to disconnect and reconnect the couplers. Regarding the Summit diverter: it is connected to the curl lines for the loader. It allows me to switch between curl and pinch with the grapple.

 

[T-Hunter]

Thanks to everyone for your input. Special thanks to Jim who explained how the boom functions and identified the problem. I disconnected and reconnected the hose coupler for the boom lift and it solved the problem. You guys are an awesome resource!