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Massey Harris & Massey Ferguson Tractors Discussion Forum

Hello Big Dean, Question

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txblu

08-30-2004 10:21:48

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Looking at your wiring diagrams, #7 of 8, shows voltage wiring from the ammeter to the oil press switch, thru the oil press sw to the fuel gauge.

Does this mean that the fuel gauge is acting as the oil press indicator? Like if no oil press, fuel will show empty regardless of the amount in the tank?

Or is the hot supposed to to to the oil press sw and then off to the fuel gauge and the other side of the oil press sw goes to a light which is grounded?

Thanks,

Mark

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Big Dean

08-30-2004 12:12:30

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Re: Hello Big Dean, Question in reply to txblu, 08-30-2004 10:21:48

Mark the oil pressure switch is activated at about 7 PSI. On the 100 series with a diesel engine that have an alternator & external regulator. The oil pressure switch excites the regulator in turn the number 4 terminal on the regulator become live sending current to the fuel gauge. Tractors with a diesel engine that have a generator the oil pressure switch sends current directly to the fuel gauge. When you shut off engine and the oil pressure drops below 7 PSI the current is shut off from the oil pressure switch to the regulator or fuel gauge according to what you have. The 200 series farm tractors with a diesel engine or and older tractor with a diesel engine that has been converted to the late style alternator with a built in regulator the oil pressure switch sends current to the number 1 terminal of the alternator to excite it and also sends current direct to the fuel gauge. Hope this answers your question about the purpose for the oil pressure switch.

Big Dean's Massey Ferguson web site

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txblu

08-30-2004 12:48:42

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Re: Hello Big Dean, Question in reply to Big Dean , 08-30-2004 12:12:30

So I think what I"m hearing is that since the diesel doesn"t need electrical ignition, something needed to turn things on/off when you used the tractor. Oil pressure made a good switch for that.

So, was there an idiot light for oil pressure which isn"t in the diagram or did your owners manual tell you something so that you knew you had it, or how did you know?

Good getting to talk with you.

Thanks,

Mark

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Big Dean

08-30-2004 19:49:23

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Re: Hello Big Dean, Question in reply to txblu, 08-30-2004 12:48:42

The Massey Ferguson tractors up through 1982 if I remember right had a manual oil pressure gauges they had a line that run from the oil galley on the block up to a tee that was screwed onto the back of oil pressure gauge then the oil pressure switch screwed into one opening of the tee and the oil pressure line from the engine screwed into the other opening that was left. They did not have an idiot light unless someone added one some people like the idiot light because it is usually notices quicker than the oil pressure gauge is when it the pressure get low. Big Dean

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txblu

08-31-2004 06:13:23

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Re: Hello Big Dean, Question in reply to Big Dean , 08-30-2004 19:49:23

Thank you sir. I have the gauge of which you speak. So to get my fuel gauge working, it"s off to find the oil switch..... off to see the wizard, the wonderful wizard of oz.....couldn"t help that.

While I have your attention. Your thoughts, please.

Understand that idiot lights work around 10 psi oil press. My MF35 has a color coded gauge where it"s red to 15, amber to 30 and green to 60. What would you feel is an acceptible low value of oil pressure in the summer, on a pretty hard worked tractor (hot engine), at idle?

Thanks,

Mark

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