87 case 245 ih overheating hydraulics

[rwinslow]

New member here,
so i have a case 245 ih that has had chronic hyd. issues. it has a front end loader added to it recently. at first the original pump would get hot and blow out the front seal. after fighting this i replace with the latest pump available from case. this is the second time i have used the tractor since i put on the new pump. while brush hogging my field i lost all hyd pressure after @ an hour or two of running. The hyd pump was blistering hot but the engine was normal operating temp. I did change all the hyd fluid and cleanned the hyd screen when i changed pumps. i put royal purple syntractor 3 back in.any help is appreciated

 

[J_J]

Case 245 Tractor - Attachments - Specs

If the attachment pump is pumping the 4.5 GPM through all hyd valve in neutral, the fluid should be flowing freely through all valves with no or very little pressure.

If the fluid is over heating, with the valves in neutral, then something is providing resistance to the flow, and maybe flowing through a relief valve.

I recommend using a 3000 psi hyd gage and determine what pressure you have at any time.

You can install the gage in a tee in the IN port of the first valve, and use it to monitor and trouble shoot the hyd system.

 

[rwinslow]

i will have to get a flow meter to confirm this, will be doing so soon. i have a guage teed in and it has been running @ 2000psi i lowered the relief to 1500 psi just to see what happened and it seems to be better but it still feels like its getting hot. im also in the process of finding a temp guage to see what the temp actually is. Im considering installing a small hyd cooler as there is enough room between the battery and the radiator.

 

[Harry in Ky]

The cooler idea is a waste of time. You need to find out why the system pressure is so high. If you're serious about a system pressure of 2000 PSI with no valves in play, you have something plumbed incorrectly or some sort of valve problem somewhere that no oil cooler will cure. You need to examine your pressure/return routing and make sure all valves are in neutral. If you can't find the problem, have someone with more experience look at it, or you will be buying more pumps.

 

[Cpjlube]

How did you plumb in the loader? There is a serious issue somewhere. If all these problems started with the loader install, start there. Can you temporarily remove the FEL and the plumbing and return the tractor to it previous state? Then you could put the gauge in into the system and check pressures. Ill bet the loader is plumbed wrong or there is a valve issue with the FEL controls.

Chuck

 

[rwinslow]

yes i agree i really should put it back original. then look at what i have. It looks as if the guys that put the loader on teed into the pressure line. but i havent traced the return line out to see where it goes. i didnt think the pump should be running that kind of pressure on it all of the time, but i havent messed with tractors very much. the hydraulic pumps i deal with at work run that kind of pressure all of the time but they are not gear pumps they are axial pumps. thwe more i think about it, im starting to wonder if the valve is wrong, i would think it should be a P-T valve center and it acts like an all ports blocked. thanks for the info. and if anyone else has any input i will certainly welcome it. i will troubleshoot this some more tomorrow and post what i find guess i should have taken it to a dealer for the loader install.

 

[J_J]

Is your tractor open center or closed center hyd system.

Someone may have put a CC valve on a open center hyd system.

If you read 2000 psi on the gage with all valves in neutral, then it could be a CC hyd system, or it is an open center hyd system and someone hooked the valve up wrong.

Open center hd system usually have a gear pump.

 

[rwinslow]

yes it was 2000 psi with all valves in neutral. so it must be a closed center valve. if it was plumbed backwards the relief valve shouldnt have lowered the pressure when i adjusted it. but what about the 3 point hyd? shouldnt it allow the system to bypass when not in use? just wondering. because it was previously plumbed directly to that before i had the loader installed. either way im going to verify the plumbing today and see what i come up with.

 

[J_J]

Did your 3pt function normally after the loader was installed?

Do you know how valves are connected on both open center and closed center hyd system?

All open center valves are in series, with a PB port feeding downstream valves, and the pump fluid flows freely though all valves in neutral.

Closed center valves are all parrallel, meaning that all valve IN ports have the same pressure available and may have full pressure or a standby pressure at the IN port of all valves. Fluid only flows when a valve lever is activated and a cyl or motor is doing work. When the action stops, the fluid stops, or is routed to tank.

If you insert a closed center valve in an open center hyd system, you inhibit the normal flow, and the fluid will build up pressure and dump over the relief valve, heating up the hyd system.

 

[Cpjlube]

The Case 235, 245, 254 etc are Mitsubishi tractors, rebadged. All, to my knowledge, are open center. There is a hydraulic port on the left side, as you are sitting on it, under the seat, above the axle. That is where the loader hydraulics are plumbed in from the factory.

Chuck