Posted by GarryinNC on August 30, 2012 at 19:39:43 from (66.44.242.123):
I am working on a friends JD 5320 tractor. It quit running on him the other day shortly after pulling it out of the shed. The fuse in the circuit the powers the injection pump fuel solenoid blew every time you turned the key switch on. I finally pulled the relay marked 'start bypass' and straight wired the pump to get it running temporarily.
Today I did some more trouble shooting, thinking there might be a wire to the pump grounded some where. The pump has two wires on the hot terminal. The one from the switch turned out to be okay but the other wire goes up to a sensor near the top radiator hose. That wire is shorted to ground and was the problem. Left it unhooked, tractor starts and runs fine.
Look this part up on the JD parts website and it is listed as a cold start advance sensor. Was just wondering it purpose(emissions or something else) and how it makes the pump advance. I assume it means timing advance. Will replace sensor, but in the meantime will it cause any problems to operate tractor without it hooked up? We live in North Carolina if climate is any factor.
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