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No oil pressure?

L

Lamont in NC

Member
My JD755 has been laid up for over a year now waiting for me to have time to fix a broken gear in the front wheel drive. I probably started it the last time about 6 months ago. I stated it up this evening as I was thinking if I got enough snow/ice I could slide into the shop from the out building with the FEL holding the front up but I wasn't sure the battery would start it. It started but I noticed the oil light wouldn't go off--never had problems with it before. I pulled the dip stick and it was covered with oil--wiped it off and stuck it in and removed it again--perfectly on the full mark. So, I tried restarting it but still the light stays on. Any ideas on what to check/what might have happened?
 
Probably the combination of sitting a long time, and thick, cold oil. The pump may have lost it's prime and the oil is too thick to start pumping.

It will probably be OK when it warms up, or you can pump some oil into the system through the gauge port to prime the pump. When you start it, leave the gauge line off, be ready to kill it as soon as oil flows. That will relieve the upstream pressure, let the pump prime easier.
 
I tend to go with Steve, the oil had already leaked down while it was sitting then the bump did not pull that cold oil up so now it is sitting there with no oil. Wait till warm weather to mess with it or you will end up trashing an engine. Like he said you may need to prime the engine pump.
 
Hi You are saying the tractors out in the snow and Ice it's sat out all that year. I have seen this problem happen once and destroy a crank and bearings, Water /condensation got in the oil pan . It didn't show on the dipstick but it froze the suction screen in the bottom of the motor. when it started no oil can get through the ice. It Might be worth getting it warm in the shop and drop the oil plug and see if you get water,if you can't find any chewed wires or other problems.
Regards Robert
 
Sorry miss read the snow ice part and can't "edit the post" but still wondering about condensation frozen in the oil pan.
Robert
 
I have an old tractor the same thing happened, water in the oil pan was actually in the oil pump so the pump drive gear broke. Had to drop the pan pull the pump and replace the gear along with clean the pan etcetera.
 
No problem Robert, that is something I wouldn't have thought of but in this particular case it was and had been for awhile above freezing so even if it was pumping water--at least it would have been pumping. It's below freezing this AM and I have a good layer of snow on the ground here in Greensboro, NC.
 
Thanks everyone.

I'm hoping for the mouse scenario. I'd figured the light would stay off if the wire was "disconnected", but it would make more sense for the pressure switch to break the ground upon seeing pressure so the light would be on for ANY problem. I do have those critters out there.

While it's cold and snowy I'll look over the repair manual, find the sensor and plan. I haven't gone out yet but they said we'd have 4 to 6 inches and I'd guess the driveway (paved) would probably be 3-4" but grass would be more of course. That's a lot for us but at least this is just snow--we normally get at least some ice in it. They say it'll be below freezing through Monday but they actually predict 60 this coming Friday! Sounds like a better time to mess with the tractor.
 
Usually, on a one wire sensor if you ground the wire the light will come on,and if it is unplugged(open,cut in two),the light will not come on.I,betting the sensor failed,stuck from setting maybe.Mark
 
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