Cat 3406b mechanical

Murphy switch. Protects from low or no oil pressure. Normal on older equipment. Roll on

 

Yeah that's a Murphy switch. A lot of John Deere people in the old days had them on their equipment. They're just an add-on an extra protection.

 

3406E is electronic. This is the tech they used back before computers were a thing.

 

If I remember right, a lot of of them came with oil, pressure and water temperature.

 

We had one on a 1976 White Plainsman. It was even red, white and blue. I wanna say that has an Allis Chalmers engine in it.

Most irrigation equipment runs Murphy switches too.

 

Lot of Pop’s trucks had them. My freind owns a 1996 Case 850G long track dozer. Uses a little 6 cylinder Cummins, you have to hold the button on it as well till oil pressure jumps up on the gauge…