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Oliver 1850 hydraulic troubles... Need some insight..

S

smokenrust

New User
Oliver 1850 diesel later production is having Hydraulic problems. First up, the power steering won't turn front wheels. Sometimes on startup, the steering wheel spins, and other times it centers itself and very hard to turn and still will not turn front wheels... previously it wanted to turn to the right more than left but now it don't turn at all... Fluids and filter have been changed and did not help...
The top of the lift system gets hot quick, just minutes...
Pto continously turns, does not seem to have brake.
The 3pt. won't go up and won't go down unless the engine is around 1400 RPM or more.
A couple of new lines have been put on the steering control but do not believe they were mixed up.
What could the problem, or problems be. thanks


Also on a different note, I remember a ShepVA on YT and he had his own site, Shep's World, of repowered Oliver/cummins tractors.. Where did they go? thanks again nuff questions. Smokenrust
 
You said: The top of the lift system gets hot quick, just minutes...Is the 3 point up or down when this happens? If the top gets that hot that quick it sounds like the oil is going over the relief valve to start with. If the 3 point is up lower it about 2 inches. Have you checked the spool in the flow divider to see if it is stuck Is anything hooked to the remote outlets?
 
(quoted from post at 09:49:39 05/06/14) You said: The top of the lift system gets hot quick, just minutes...Is the 3 point up or down when this happens? If the top gets that hot that quick it sounds like the oil is going over the relief valve to start with. If the 3 point is up lower it about 2 inches. Have you checked the spool in the flow divider to see if it is stuck Is anything hooked to the remote outlets?
Click to expand...
Arms were not all the way up to start with, and there were nothing attached to the remotes.
We have had the flow divider out and it did not seem to be stuck.
"The oil going over the relief valve" That was my first thoughts too but then why have to raise the engine RPMs to get 3pt to work? Then it seems I hear a louder buzz from a relief valve opening... Or so I think... can't exactly tell where from, (hearing isn't the greatest) if its the flow divider squaking louder or some other valve...
Moved the remote levers both backwards and forwards and nothing changes either.
Is this open or closed loop system?
I know the 1855 is closed loop, and thought 1850 and earlier were open loop.
 
(quoted from post at 19:13:12 05/06/14) When the top cover gets hot is it hot in front of the seat? Does this tractor have power-beyond ?
Click to expand...
Hot all the way to the end of the oil filter housing.
No, I do not believe it has power beyound.
Was just thinking about this, the oil cooler out front of the radiator seemed to be cool.

How/where does the oil come from to be cooled? from the power steering unit? so if oil is not passing the unit, then you get no cooling in the cooler, and if oil can't pass steeringunit, then if system is open loop, it builds pressure and thus creates a high pressure back in the system and then maybe causes the other problems???
Of course passing the bypass creates heat fast.
 
Worked on a 2-70 that did just what your explaining. Replaced a steering line on hydramotor, steered fine but hydraulic got hot! After lots of head scratching replaced hydramotor and took care of problem. Apparently oil cooler oil goes through hydramotor to oil cooler, with out this flow oil goes over relief valve and gets hot. 2-70 is different hydramotor but i assume same principle.
 
(quoted from post at 18:31:31 05/07/14) Worked on a 2-70 that did just what your explaining. Replaced a steering line on hydramotor, steered fine but hydraulic got hot! After lots of head scratching replaced hydramotor and took care of problem. Apparently oil cooler oil goes through hydramotor to oil cooler, with out this flow oil goes over relief valve and gets hot. 2-70 is different hydramotor but i assume same principle.
Click to expand...
ell today I went over and took a look at saginaw. I see the unite has 4 lines... and I am believing the pressure line is on the left side of unit as you sit in the seat, and I see the return line headed to the cooler on the back side (towards operator) and heads out to the right side... and thenthere are two lines on the front side /top side.... I believe they are for left/right steer and go to steering cylinder.
This tractor has pressure line currently attached to lower port front side and Left port of steering unit is attached to the line headed to the steering cylinder.
So I believe you are right in your observation of oil getting hot. and if I am correct in my observation of lines hooked wrong, the pressure line is pushing on a port that oil should be flowing out of... I will find out tomorrow... when I have wrenches with me. Hope its just that simple. Thanks
 
Well, changed the lines on the saginaw and the steering wheel turnes on its own, but now, at least it will steer some. Probably take another Saginaw we have and try that and see if it works better.
 
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