Sinking Eagle Hitch.

L.Fure

Well-known Member
The eagle hitch on the 300RN I have been working on won't stay up. It sinks faster when I have the bush mower on it. I have to keep one hand on the control lever to bump the hitch up every few seconds. I'm thinking it might be the two interlock check valve balls (7210) not seating. Can these be reseated using a brass drift, or does the ball and seat need to be replaced?
 
Very likely piston seals leaking by. Remember you had an overfull transmission and low hydraulic oil in the torque not too long ago. The 311 has flooded axles so transmission oil level rises slowly compared to torque tube oil level dropping. I would keep an eye on the hydraulic oil level.

Joe
 
(quoted from post at 02:07:43 10/29/17) Do you constantly have to add fluid to the range-hyd housing?

I haven't owned the tractor long enough to establish oil consumption yet. I'll check the oil levels in the torque tube and transmission to see how much might be getting by the lift cylinder seals. As fast as the eagle hitch is leaking down the torque tube should be empty by now. I'm still leaning towards the check valve leaking though.
 
Hold Up on playing with the pump !,..I am Beting on the Piston Seal ,.,. That is common ,with nearly every 430
that wandered up the drive here looking for a home to earn their keep ,. Not saying You are incorrect in your
diagbosis,, Monitor the Oil Level in the rear end ,after a days use the torque tube will be empty,the dripn
piston sits directly over the rear end ,, this is how the oil gets in the rearend . a full rear axle of oil will
labor the engine hard to churn all that oil in hi gear on the road,.. Guess How I KNOW ?
 
If it is leaking back through the interlock then the control valve has to be leaking through also for the hitch to drop.

Joe
 

I checked the oil levels in the 300, this morning, and didn't see any loss in the torque tube. I did see a little milkyness in the transmission though. This most likely came from the axel housings that I neglected to drain, even though I was advised to do so. One thing I did notice that there is air in the lift cylinder. It has a spongy feel to the lift arms when they are raised to the top.
 
(quoted from post at 20:09:20 10/29/17)
I checked the oil levels in the 300, this morning, and didn't see any loss in the torque tube. I did see a little milkyness in the transmission though. This most likely came from the axel housings that I neglected to drain, even though I was advised to do so. One thing I did notice that there is air in the lift cylinder. It has a spongy feel to the lift arms when they are raised to the top.

The spongy feel may be from oil leaking pass the piston being replaced with air during down time. Milkyness in trans oil is likely as you say from an incomplete drain but air entrained oil doesn't look all that much different, maybe some of both.

Joe
 
Tom , That Valve Just may be his problem after all , judging from his report of the oil levels and the sponginess in the lift arms .,.If You Have to teach the process of troubleshooting and diagnosing the proper repair , I would like to learn all i can so my own ignorance could be cured somewhat.
 

I'm going to put this project on the back burner for now, and take it up this spring. The 300 won't be used during the winter, plus I don't like working on something like this when it's cold outside. I don't have an enclosed area where I can work on something like this in comfort.
 
One thing you might check before you hang it up for the winter is the linkage for wear or binding that can prevent the control valve spool from centering in neutral when the lever is in the neutral position. Any leak by the control valve spool in the return stroke will allow pump pressure to enter the interlock pushing the ball off the seat.

Joe
 
(quoted from post at 19:31:48 10/30/17) One thing you might check before you hang it up for the winter is the linkage for wear or binding that can prevent the control valve spool from centering in neutral when the lever is in the neutral position. Any leak by the control valve spool in the return stroke will allow pump pressure to enter the interlock pushing the ball off the seat.

Joe

Surprisingly, the linkage is tight and right on this tractor. The 530 that I own had issues with the linkage when I bought it. I had to replace a roll pin on the valve side of the linkage. That was a real challenge getting the pin started in the hole.

I do have one question though. How can I bleed the air out of the eagle hitch hydraulic cylinder?
 
(quoted from post at 13:01:48 10/31/17) They self-bleed
cnt

I've already ran it up and down quite a few times, the other day, with no change. I'll put the scraper blade on it and see if that helps get the air out.
 

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