Oil Pressure Sending Unit

Another dump question. Sorry, Mine has a ground wire and wire going to the gauge. All I can find is a one wire. Don't the one wire ground itself through the lower metal body. Mine is located in the metal tube line and not the block.
mvphoto33256.jpg
 
The 3600 did not come with an oil pressure gauge from the factory. There was only a low pressure warning light. The only gauges were for temperature and fuel level. The low oil pressure warning light receives power from the same wire that powers the charge circuit warning light and the voltage stabilizer that in turn powers the two stock gauges. The other side of the warning light has a wire that goes to the "sender" which is in reality just a pressure activated switch that provides the path to ground whenever the pressure is below some minimal amount.

If yours has a gauge then the setup is not as it was when it left the factory and is is anybody's guess as to how it is supposed to be hooked up. My guess would be that the tube goes to the gauge, and the wire goes to the original warning light, but that the switch for the warning light is not mounted in the original location and was therefore not getting a good ground so that second wire from the body of the switch to ground was added to complete the circuit to ground.
 
On your tractor, somebody did a "workaround" to use a 2-wire N.O. oil pressure switch. It looks like a common Hobbs/Stewart Warner switch that was typically used to activate hour meters. Massey Ferguson used them to turn power on to the dash gauges and alternator "excite" upon engine startup, as well.

You can simply replace it with a 1-wire N.O. oil pressure switch, so long as the tubing provides an adequate ground to the new switch's body.
 
Is anyone else curious as to what lines that sender appears to be attached to? Those two lines appear to be
cooler lines of some sort, and they look factory by the way they're bent, but they don't look like anything
I've ever seen before on a Ford.

If those are SOS cooler lines, they're on the wrong side. And if they're SOS cooler lines, why does the
sending unit for what appears to be engine oil pressure look like it's tapped into them?

Finally, the bracket below the alternator, what's that for? Again, it looks factory, but unlike anything
I've ever seen before on a Ford.
 

Even though the tractor is a 3600 it was a special order for TVA.
It has a 4x4 torque convertor and planetary axle like used in a 340 utility.
The line that sender is attached to is the trans cooler lines but parts list doesn't show a fitting or sending unit in the line.
I'm thinking the sending unit like the brackets under the alternator are add ons.

801 Powermaster post a photo of the dash so we can see if any extra gauges, meters or lights have ben added.

Also look behind the power steering pump to see if the factory engine oil pressure sender is still there.
 
Makes sense on the torque convertor trans, although I've never seen that on an ag tractor. Who/what is TVA?

As I look at the picture again, I'm thinking that the sending unit is screwed into a tee which is screwed into the block, and that it only appears to be tied into the cooler lines. Coming off of the tee is an oil line which I'm guessing goes to an oil pressure gauge on the dash.
 
(quoted from post at 08:46:35 03/22/19) Is anyone else curious as to what lines that sender appears to be attached to? Those two lines appear to be
cooler lines of some sort, and they look factory by the way they're bent, but they don't look like anything
I've ever seen before on a Ford.

If those are SOS cooler lines, they're on the wrong side. And if they're SOS cooler lines, why does the
sending unit for what appears to be engine oil pressure look like it's tapped into them?

Finally, the bracket below the alternator, what's that for? Again, it looks factory, but unlike anything
I've ever seen before on a Ford.

This is the guy with the 3600 with the factory installed 4x4 torque converter auto reverser, so I would bet that they are the cooling lines for the trans, but given that it was a special order for the TVA, the guys at the factory probably had to do some non-standard bending to get them to work with the front end of a 3600 that doesn't have the big cast bolster like all of the Utility/Industrial models that the auto reverser trans would have normallly come on.
 
That makes sense, so thanks for that explanation.

The only mystery left for me is that bracket under the alternator. That doesn't look like a homemade job, and yet I'm struggling to think of what might have gone there. Air compressor maybe?
 
sorry, the picture is deceiving. There is a piece of pipe straight from the block, then a t with the switch on top and a steel line to the oil gauge out of the t. It isn't attached to the cooling lines that run to a front mounted transmission cooler. I will take a picture of the dash tomorrow and post it too. Thanks for all the help and I also have no ideal what was mounted next to the alternator.
 


Maybe this one out of jeep wrangler?
https://www.summitracing.com/parts/omx-1721905/applications

and this one out of a lincoln 250 pipe line welder for sure will work. When the oil pressure came up, it was used to connect the regulator to the alternator and turn on the charging. These were magneto welders and the off/on switch simply grounded the mag to turn it off, so the clever oil pressure switch fixed the charging problem, before internal vr were availible.

https://www.ebay.com/i/152959460425?chn=ps
 

Someones added in several gauges.
The sending unit in the prier photo is the switch to operate the hour meter.
The oil line should go to the oil pressure gauge.
Don't see the oil pressure sender so the light on the dash probably doesn't work.
Volt meter is a simple add on
Not sure where they installed the trans temp sender.
Everything on the dash should still work except the oil pressure light.
 

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