Loader GC2310 hydraulic issues...again!

[slb04786]

As always you are correct, it is a priority flow control, although the factory service manual calls it "flow dividing valve". The steering valve gets 7.5 liters/min, and the implement flow is 16.5 or 18.7 liters/min depending on whether it is the 23 or 25 horsepower model.

That is good to know. As I said in another post I took the pressure spring out of the priority flow valve, reassembled and then I had pressure at my loader valves and BH.
Thoughts?

 

[dicktill]

Thanks for the reply. I have taken the pressure line off at the loader valve and got no flow when the tractor is running. I moved back to the block at the top of the main hydraulic control and got no flow there. Which stands to reason this is the block with piping that goes to the loader pressure hose. I put a gauge on the port near the power steering pressure hose and got 1200# with the steering turned far left or right. Overnight I looked the hydraulics schematic over and concluded it was either the flow control valve or the main hydraulic valve. This AM I started with the flow control because you can get it out without taken the whole valve body off the tractor. There is what appears to be some sort of pressure control or relief spring that controls a plunger that slides back and forth inside the flow control valve. This isn’t shown on the parts list. I took the spring out so the plunger was free to move back and forth. I reinstalled it, started the tractor and then I had hydraulics to the BH(I have the FEL hoses disconnected because the bucket is tied up to prevent it dropping down and dragging). I still didn’t have 3pt lift so that confuses me somewhat. I am leaning towards the flow control but would like to verify for certain. Anythoughts? I have my pressure gauge on the left side near the PS pressure line and I am only seeing readings from the PS. I need to get on the main pump port to verify full hydraulics pressure. Thanks guys!

<snip>

I do know the main hydraulic valve controls the flow to the 3 pt lift and hydraulics. You have no hydraulics when you are operating the 3pt handle. And that is the main hydraulics spool valve in that assembly under your seat. Ask me how I know.

Thanks for your valued input.

Yes, but in the opposite order: loader, backhoe, then 3-point. Have you looked at: How Massey Ferguson GC 1723 & 1725 hydraulics are plumbed?

" Ask me how I know." Please explain.

That is good to know. As I said in another post I took the pressure spring out of the priority flow valve, reassembled and then I had pressure at my loader valves and BH.
Thoughts?

Photos please! Have you taken out the pressure relief valve? It may have some crud in it.

Do you have the factory service manual?

 

[oldnslo]

Slb
How many hoses connect between the back hoe and tractor? Reason for asking is that some models do not allow the 3 point to work with the back hoe installed.

Can you post the hydraulic schematic that you have. It might help with potential doagnosis.

 

[slb04786]

Yes, but in the opposite order: loader, backhoe, then 3-point. Have you looked at: How Massey Ferguson GC 1723 & 1725 hydraulics are plumbed?

" Ask me how I know." Please explain.


Photos please! Have you taken out the pressure relief valve? It may have some crud in it.

Do you have the factory service manual?

Yes, I am aware of the flow order. I was commenting the the main control valve/3pt spool will override or disable the flow to the FEL and BH. I way I know this is I was working on my lower lawn which is a little wet are and got too close to the ditch and the front of the tractor slid down the ditch. I had my BH on so I was using that to lift and pull my tractor back out of the ditch. In process of doing this I turned in the seat to the right and was operating the BH with my right hand. All of a sudden I lost hydraulics to the BH and FEL. I thought I had blown my hydraulic pump. Turns out I had hit the 3pt lift handle with my right leg which moves the main control valve. Once I returned the handle to its detent I got my external hydraulics back.

That is what I thought had happened Sunday when the hydraulics stopped working, But a quick check ruled it out. I am now leaning towards the flow divider given my test this afternoon. I will keep you posted on what I find. Problem is I am running out of days. I leave to go to Florida for the winter in a couple of weeks and need to get my camper winterized, closed up, and the Massey fixed.

 

[slb04786]

Slb
How many hoses connect between the back hoe and tractor? Reason for asking is that some models do not allow the 3 point to work with the back hoe installed.

Can you post the hydraulic schematic that you have. It might help with potential doagnosis.

Oldnslo,
I have three hoses going to and fro the BH. One goes to the PB port on the loader valve, another to the tank return on the transmission, and the third goes to the main control valve from what I can tell. I think they are hooked up correctly and the tractor had been working ok until it just stopped. I may try unhooking the BH and bypassing it next time I am onsite.

I don't have a hydraulic schematic for the BH but I have the GC2300 service manual. I will attach the 3 pages about the hydraulics. It doesn't mention the FEL or BH connections, just aux valve/loader valve.

 

[oldnslo]

Your three lines to the backhoe sound correct and agree if was working they probably are not the problem especially since not getting any flow from priority flow control to FEL circuit. Typical operation of priority flow is if you block priority flow, excess flow will stop also. Blocking excess flow has little to no effect on priority flow.

Is there any passage in the priority flow block or manifold that could connect excess flow to tank? I.e. some drill path that is supposed to be plugged but plug worked loose.

This would explain having steering but no auxiliary functions.

Certainly not a “normal” failure mode.

 

[dicktill]

Yes, I am aware of the flow order. I was commenting the the main control valve/3pt spool will override or disable the flow to the FEL and BH. I way I know this is I was working on my lower lawn which is a little wet are and got too close to the ditch and the front of the tractor slid down the ditch. I had my BH on so I was using that to lift and pull my tractor back out of the ditch. In process of doing this I turned in the seat to the right and was operating the BH with my right hand. All of a sudden I lost hydraulics to the BH and FEL. I thought I had blown my hydraulic pump. Turns out I had hit the 3pt lift handle with my right leg which moves the main control valve. Once I returned the handle to its detent I got my external hydraulics back.

I am befuddled about this event! It makes no sense to me considering the way that the loader, backhoe, and 3-point valves are plumbed. Is there any chance that something else happened? (color me confused)

 

[dicktill]

I don't have a hydraulic schematic for the BH but I have the GC2300 service manual. I will attach the 3 pages about the hydraulics. It doesn't mention the FEL or BH connections, just aux valve/loader valve.

Look again at the link I provided above for the GC hydraulics. The backhoe valve is shown on that. But be sure to scroll down to the last post with the latest drawings. Those also show the loader lines albeit on your older model the coupler colors may vary.

I have looked back at your earlier threads on hydraulic problems and have refreshed my mind about "where we've been".

Good luck.