Just bought a Stieger with an 855 in it to fix up. It will start on the second try everytime. You have to crank it once then the second time it pops right off. Doesn't matter how short or long you crank it the first time and you can wait a while after the first try and it will pop right off. I'm thinking I'm missing something with the Murphy switch. Measured the voltage on the fuel valve at the pump and it looks like it has plenty of voltage on the first crank.
- Thread starter MF294-4
- Start date
Gene Davis (Ga.)
Well-known Member
The Murphy switch group on my generator has a button you have to manually hold in for a few seconds while the oil pressure builds up enough to raise the needle off the stop peg in the oil pressure gauge. it is a small black button on the beside the oil pressure gauge. Yo can crank this generator till the cows come home and if the push button is not held in it won't allow it to start up. Oil pressure failure safety feature. It stops the engine if the pressure falls below 5# on the gauge.
After it has sat long enough that it likely won't start, run a jumper wire from the battery terminal on the starter solenoid to the fuel shutoff solenoid, and see if it will now start right up, then you will know if it's an issue with the Murphy relay, or an IP/fuel shutoff issue.
(Not sure HOW the Murphy system gets overridden for starting, do you have to hold in a button, or is there a "crank" voltage connection between the starter switch and the Murphy relay or other method?)
(Not sure HOW the Murphy system gets overridden for starting, do you have to hold in a button, or is there a "crank" voltage connection between the starter switch and the Murphy relay or other method?)
T in NE
Well-known Member
- Location
- Cambridge, Nebraska
Never heard of a tractor having a Murphy switch.
If your Murphy system is working correctly then the issue is in the fuel system on the 855. I have a straight truck that is that way. If you just jump in and start cranking you can run the batteries clear down and it will not start. Crank it 10 seconds an wait 20 seconds and it will hit off right away. It has been that way for over 15 years. I think some thing in the fuel pump solenoid/shut off sticks and needs some fuel pressure to open.
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