L1500 Low oil pressure: Kubota Review  -- Kubota Tractors Discussion Forum and Review L1500 Low oil pressure: Kubota Review -- Kubota Tractors Discussion Forum

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 10-10-2003, 19:37 Post: 65982
rtate
2003-10-10 19:37:19
Post: 65982
 L1500 Low oil pressure

I was having trouble with low oil pressure on my L1500, so I replaced the oil pump. Mowed with it today and after working it pretty hard the low oil pressure light started coming on again. It seemed to be running pretty hot. What could the problem be if it's not the oil pump? It does seem to run ok for a longer period of time with the new pump, but started coming on anytime the RPM dropped below about 800 RPM.

HELP!






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 10-10-2003, 19:44 Post: 65984
kwschumm



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 L1500 Low oil pressure

I'd start by checking the oil pressure sending unit. If it's working OK then a couple of other possibilities could be using an oil of too light a viscosity, or (and this is bad) a worn out engine (bearings, valve guides, etc).






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 10-11-2003, 04:33 Post: 66002
harvey



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 L1500 Low oil pressure

I'd get a live pressure guadge and put it were the sending unit is mounted. Me thinks before you start replacing stuff you should get a accurate reading of the pressure.

If you have low pressure after running, are return passages partially plugged? Shut down engine and pull dip stick is it low? Does the level come up after a while? This problem is usually caught while oil is cool.

If you have excessive engine wear an oil anaylisis can tell you where the wear is.

As ken asked what kinda oil are you using? Is the engine burning oil? Losing/leaking oil? Does the engine have enough oil?

Did someone swap a dipstick and give you one that is too long, 2-3 quarts will show full while it should have 5-6???






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 10-11-2003, 07:51 Post: 66010
Art White



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 L1500 Low oil pressure

What is the low RPM limit supposed to be for that tractor? You could have an engine that is that worn that it would be over heating and causing your problem. The boys gave you some good advice from both Ken and Harvey, a cheap oil would also do what you are refering to.






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 10-11-2003, 08:39 Post: 66018
TomG

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 L1500 Low oil pressure

For more exotic problems, I've heard that a few Kubota engines had an aluminum plug on the ends of the rocker arm shaft. These plugs had a tendency to come out, which would produce low pressure and a lot of oil under the rocker-arm cover. I don't know which engines they were but I heard there was a factory fix for the problem.

Good to make sure the pressure is really low and maybe the engine really is over-heating before doing a bunch of troubleshooting though.






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 10-11-2003, 18:30 Post: 66046
rhtate



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 L1500 Low oil pressure

I Need tohook up a gauge again. I did that before I replaced the oil pump and it would show good pressure until it warmed up, then the pressure would drop.

It was overheating when the pressure really dropped this time. I think I was overworking it in very tall, thick wet grass. I did not relieze it was too hot until I shut it down and i could hear the coolent boiling. I am running Dello 400 10w40 oil. Any othe ideas?






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 10-11-2003, 18:31 Post: 66047
rhtate



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 L1500 Low oil pressure

Would overheating cause low oil pressure?






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 10-11-2003, 18:36 Post: 66048
rhtate



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 L1500 Low oil pressure

Would a worn out engine cause low oil pressure with a new oil pump?






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 10-11-2003, 19:44 Post: 66051
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 L1500 Low oil pressure

Both over-heating and excessive engine wear can produce low oil pressure. Multi-grade oils thin out above some temperature and excessive bearing clearances or a broken line will reduce pressure. Not an easy thing to sort out because low oil pressure can cause over-heating and so can heavy work on hot days.

If the pressure is OK at first, I'd start by looking for causes of over-heating, but first I'd check the temperature with a thermometer unless the engine makes black smoke or a gauge shows it's over-heating. A bad rad cap can cause the coolant to boil at normal coolant temperatures, but it usually boils over too. Then, I'd start on the list of over-heating causes and there are a bunch. Fan belt tension and clogged rad are easy to check. Water pump, thermostat and hoses are not too bad. Flushing the cooling system and replacing with new 50/50 coolant isn't too difficult. Checking for exhaust obstructions, and engine adjustments is a little more difficult and there are some other things. You might notice if the engine oil level increases and if there are bubble in the coolant. A bad head gasket also can cause over-heating.

At least typical causes of over-heating can be checked out and eliminated as causes in a fairy systematic way and without a huge amount of work. If the pressure starts out low and especially if if it has high hours I'd start by checking out the engine. I'd keep in mind that it's not good to shut down an over-heated engine or to run one that has low oil pressure.






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 10-12-2003, 05:33 Post: 66063
TomG

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 L1500 Low oil pressure

I was too busy figuring an organized way to sort out the problem and forgot to mention an obvious test and I also assumed it's a conventional water-cooled diesel engine.

Looking through the rad cap hole when the engine is at operating temp is a quick check for many coolant system problems. The coolant should be swirling due to the pump flow after the thermostat opens--assuming the tractor has a water pump, thermostat or rad for that matter. It does help to know how normal flow looks though. Some more assumptions on my part are that the the oil filter is right and reasonable new and that the oil pump pressure-relief valve is OK because a new pump was installed.






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