John Deere 2955 Hydraulic Issues Help!

[Tx Jim]

If hyd's operated that indicates that frt pump is GOOD but has an oil supply problem when it doesn't operate correctly. Frt hyd pump doesn't have the capability to SUCK oil so therefore oil must be pumped to it by trans pump.

 

[mkt]

I知 going down and try t see what the flow rate is for the rear pump. Also I see a Double headed nut or what may be some type of plug on the top side of the oil filter casting cover.The large hex is 1. 1/4 and the smaller hex is about 3/4 could this be a bypass that you mentioned? Can稚 figure out out how to post pictures from iPhone or I would post a picture. Thanks

 

[Zebrafive]

Does it have HI-Lo trans? I am thinking Hydraulic PTO clutch. Both of these are fed from trans pump. If an internal line breaks, flow will go to sump rather than to front pump.

 

[Kyle_in_Tex]

I知 going down and try t see what the flow rate is for the rear pump. Also I see a Double headed nut or what may be some type of plug on the top side of the oil filter casting cover.The large hex is 1. 1/4 and the smaller hex is about 3/4 could this be a bypass that you mentioned? Can稚 figure out out how to post pictures from iPhone or I would post a picture. Thanks

I wish I had good news for you, but I don't. My friend bought one used, but only test drove it for 20-30 minutes in a lot. He had the same symptoms when he got home. Turns out he had to have the tractor split and replace the pump (and possibly the lines) in the rear. While he was in there, he did a full clutch job, and put all new seals and such. The tractor had 5000 hours on it when he bought it. They had put new tires on it. It probably was used for pulling logs around.

There is some good news, after getting it done, it has been a great tractor for 10 years, other than the normal wear and tear issues. He still loves it.

 

[mkt]

I just did the test and it pumped 4.5 gallons in 1 minute. Cold start about 1/3 throttle. Now what痴 next? Thanks

 

[Kyle_in_Tex]

I just did the test and it pumped 4.5 gallons in 1 minute. Cold start about 1/3 throttle. Now whatç—´ next? Thanks

When the oil heats up after a while, it gets thin and doesn't pump so well. You lose hydraulic pressure across the board.

 

[mkt]

The tractor does not have hi-lo. It has high and low range gear shift. Tractor shows 1455 hours. Thanks everyone!

 

[Kyle_in_Tex]

 

[Tx Jim]

Hyd filter relief valve that I recommended checking is keys 28-31 in photo below.

 

[Kyle_in_Tex]

The tractor does not have hi-lo. It has high and low range gear shift. Tractor shows 1455 hours. Thanks everyone!

It could be that you possibly have hydraulic oil going through a small orifice, such as a barely open valve or something, that is heating the oil up. Check all your control valves and joystick valves for easy and free operation. Anything that should be self centering, should be centered. Anything that should be shut, is shut. So on and so forth. Cable operated valves are very often a culprit. I have to lube stuff with spray lubes, and sometimes take them apart to free up corrosion.