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no oil pressure

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chris krivohlavek

Member
I have a T200 bobcat with no oil pressure. I have an actual gauge installed on it. Started and worked with it on 20 degree day next day have no oil pressure. What should I look for before putting in new pump. I put in new timing belt 300 hours ago. What I found here, I will need to pull motor again.
 
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chris krivohlavek

Member
The bobcat sensor says low and shuts motor off. Also I put on a gauge that shows 0 pressure. I put this on over a year ago, because it would not start and coded oil pressure low. It was plug wire to oil pump sensor.
It only ran 2 to 3 min. before light came on and motor shut off.
I would like to thank all who are trying to help me.
 
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Tubroos

Tubroos

Member
I'm no Bobcat expert, but I'd always temporarily plumb in a known good mechanical gauge under these circumstances to help see what's really happening...
 
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chris krivohlavek

Member
no gauge was used to put belt on. I did not do the work my nephew put it on. I believe he used a straight edge and measured the deflection of the belt??
 
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chris krivohlavek

Member
Ok talked to nephew , we did rent a gauge to put new belt back on. Also cut filter and found no metal. Where would there be a bypass for oil filter. Could it have stuck open when I started in cold weather?
 
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Tinkerer

Senior Member
It could be a failed oil pump. I don't know about a Bobcat pump, but it may have a pressure regulating spring in it that has failed. I have seen it happen and the same symptoms you describe is what I saw.
The supply tube for it may have gotten loose and it is sucking air. Especially if it was low on oil.
 
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Samuel47

New Member
This isn't the first time this has happened to me. It was either a bad sending unit or a faulty gauge every time. I wouldn't be concerned about the light because you've added a mechanical gauge that shows good oil pressure.
 
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Tinkerer

Senior Member
Samuel47 said:
This isn't the first time this has happened to me. It was either a bad sending unit or a faulty gauge every time. I wouldn't be concerned about the light because you've added a mechanical gauge that shows good oil pressure.
Click to expand...

My understanding from what I have read is that Chris still has NO oil pressure.
The gauge they used entered the discussion when his nephew installed the new serpentine belt.
Perhaps I misinterpreted what I read.
 
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chris krivohlavek

Member
New gauge is also showing 0 oil pressure. It was 2 1/2 qts low of oil. If there is not a bypass plug on it so I can check that. It will have to go to dealer.
We pulled motor once do not want to do it again. How much damage if I drive it on a trailer, would be less than 2 or 3 min.
 
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56wrench

Senior Member
Just my 2 cents. If it actually has NO oil pressure and that engine uses a spool(or similar) type oil pressure regulating or relief valve, the valve may be stuck in an open position due to moving beyond its normal travel range during an abnormally cold start-up caused by thick oil. In the untravelled part of the valve bore there can be varnish build-up causing the spool to stick because the clearance may be less in that area. I saw it happen once about 30 yrs ago
 
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