High oil pressure?

[michal]

Hello,
Please, I have question. I bought Kubota L2601 year ago. It had low pressure (5 PSI), so I removed front gear case and fixed fallen camshaft plug. Now with gauge I am reading 60 PSI hot idle and 100 PSI at 2500 RPM. Which I think is quite high. Is it high?

Oil is 15W-40 (fresh oil). Even previous owner used this oil, he maybe tried to compensate low pressure (missing cam plug). Manual says 10W-30 for this engine. I am going to change oil. Will it help enough, what do you think? Or should I do something else...
I checked relief valve on the filter cover on the engine side. It is in good shape.

Thank you very much.

EDIT - I left tractor idling about 10 minutes with gauge connected in sender port, not sure if oil get fully warmed. But at cold start, it was 80 PSI idle.

 

[Dave_eng]

Your tractor does not seem to be one which was sold in North America.

The D1301 engine was used in the L295.

65 psi would be highest oil pressure I would ever expect to see.

I would check with a second gauge.

There is a oil pressure relief valve to prevent oil pressure from going to the levels you are seeing. Was this affected by the repairs you just did?

I would not run the engine until you have this completely diagnosed.

What oil filter do you have on the engine?

Dave

 

[bernhardine]

... I am reading 60 PSI hot idle and 100 PSI at 2500 RPM.

looks like a faulty pressure regulation valve.
Doublecheck your gauge first. If it's correct, you'll have to check the valve.
I don't know the specs of that engine, but normaly the valve is located in the Oilpump housing.

 

[boz1989]

Could the p o have modified the pressure relief to try to "fix" the low oil pressure?

Sent from my LGMP260 using Tapatalk

 

[Dave_eng]

Could the p o have modified the pressure relief to try to "fix" the low oil pressure?

Sent from my LGMP260 using Tapatalk

The pressure relief by design would only be diverting oil back to the sump when the engine is cold.

Normal operating temps should not have pressures needing the action of the relief valve.

Most of the time the engine issue is too low oil pressure caused by worn bearings or, something in the oil gallery has fallen out creating a big leak and thus low pressure.

I cannot imagine being able to alter the relief valve to create higher pressure.

Of course putting the wrong oil pump in the engine could change everything.

Dave

 

[michal]

Thank you guys for answers.

Oil filter is Donaldson P502022.
I only plugged the front of the cam, I didn't touch anything else.

Oil pressure relief valve looked clean, BUT - i did not checked if someone installed shim inside it. I will check this. I think there isn't relief valve on the pump. According to part list for D1301, there should be only relief valve on oil filter housing (with big nut), which I mean.

I will test the gauge itself for sure (it is new, low cost). Maybe I could remove the relief valve, plug the hole - only the first (external) hole, if you understand, what I mean. Then do the test - if pressure is very low, then path to relief valve is clear and the valve itself should be the issue. Am I right?

 

[Dave_eng]

Thank you guys for answers.

Oil filter is Donaldson P502022.
I only plugged the front of the cam, I didn't touch anything else.

Oil pressure relief valve looked clean, BUT - i did not checked if someone installed shim inside it. I will check this. I think there isn't relief valve on the pump. According to part list for D1301, there should be only relief valve on oil filter housing (with big nut), which I mean.

I will test the gauge itself for sure (it is new, low cost). Maybe I could remove the relief valve, plug the hole - only the first (external) hole, if you understand, what I mean. Then do the test - if pressure is very low, then path to relief valve is clear and the valve itself should be the issue. Am I right?

Unfortunately since you are in the Czech Rep. I do not know if you can buy genuine Kubota filters. We have seen on this forum, owners with problems which are traced back to the use of fluids and filters which are not a good match to a Kubota's needs.

For example, when I search for the recommended Donaldson filter for an equivalent to a Kubota 16414-32434 (L295) I get P550318 which is different than you are using. Next, Kubota has replaced the earlier number with HH164-32430. Donaldson say their P550939 is equivalent which again is different from what you are using.

This confusion can be a clue to a serious problem or maybe not.

Before commenting further, I would be more comfortable knowing your gauge is reading the correct pressure.

Dave