Idiot lights
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=7961
Printed Date: 30 Jan 2025 at 11:41pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Idiot lights
Posted By: D17JIM
Subject: Idiot lights
Date Posted: 11 Feb 2010 at 1:42pm
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OT: My sons Kubota's oil light is coming on and staying on until the tractor is speeded up cnsiderably. According to him this is a change and he was wondering if it could be the oil pump or the sensor or the light. I said yes. He said the tractor sounds fine as always and has never used any oil. It's a 3 cy diesel. Is there any testing I can do before he just changes the sensor and or light. Hate to drop the pan but if we need to we can haul it to my shop and tackle the job. Any suggestions before we do that. THX, Jim
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Replies:
Posted By: Rawleigh
Date Posted: 11 Feb 2010 at 1:56pm
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Put a Tee where the pressure sender is and put a back mounted mechanical gauge on it as well as the idiot light
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Posted By: Gregor
Date Posted: 11 Feb 2010 at 1:57pm
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I'd get a pressure guage and check the pressure. I don't know the spec's but your dealer should. There is a chance that the sending unit is bad and needs more pressure to turn the light out (hopefully). Also does it take more RPM to turn out the light when the engine is warm, if so that is and indication of low oil pressure due to something out of clearance . I don't know much about kobuta, but get a pressure check done. If low, then you got a project to figure out where. Good Luck.
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Posted By: Gerald J.
Date Posted: 11 Feb 2010 at 9:39pm
I have also seen the oil pressure switch be the cause of low oil pressure as it was leaking through the switch.
Gerald J.
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Posted By: D17JIM
Date Posted: 12 Feb 2010 at 6:59am
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Thanks to all. I hope to get over there and check it out Saturday. The T idea is a good one if I can find a metric T. Darn metric stuff is still hard to find around here. Jim
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Posted By: firebrick43
Date Posted: 12 Feb 2010 at 7:00pm
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Are you sure its metric? Many metric tractors and engines still use SAE NPT and JIC fittings.
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Posted By: DiyDave
Date Posted: 12 Feb 2010 at 7:39pm
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I had a kubota, that would act like you describe, I would put a mechanical gauge on it, as the other poster said. If that confirms drop in pressure, try dropping the oil pan, and take the suction tube off of the pump at the joint. There is an o-ring that got hard, and cracked, when the oil got thin enough it would suck air. That model was a 2 cyl, L185, if I remember the # right.
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