I have a Turbo Diesel Ford 4630 that is "emissioned", which means it was one of the last they built. Different injection pump and fuel filter setup, although it uses same fuel solenoid as earlier 4630's. First it would not start and I figured out the solenoid was bad. Replaced it, and started fine (after priming it) but then would not shut off with key. Kept running. Had to turn off fuel at the tank, which meant it lost prime again. Replaced the solenoid again and it did the same thing. Now, it won't start again.
I figured out that the relay puts voltage to the solenoid when key is turned on, but when you turn the starter, the voltage at the solenoid drops to zero. Thought it was the relay, but I pulled it and tested it and it works fine. Tested it with resistance measurement but then put a load on it and it still worked fine. However, voltage at the solenoid still drops to zero when the starter is running.
I can't find a wiring diagram on this machine. Have seen several and have the IT shop manual (worthless for the emissioned tractor) and the New Holland Operator's manual (also almost worthless for this tractor). No wiring diagram. Found several through this forum and I gather there is a diode that may be causing the problem but don't know where it is or what it looks like.
Dealer finally told me how to shut down the tractor without turning off the fuel. Just put it in high gear, with throttle down as low as possible, and gradually let off the clutch. Tractor will bog down and die. Sure saves priming the darn thing every time.
Still no idea why it would not shut down, but first thing first, I have to get it to running. I guess running a wire direct from the battery to the solenoid would keep it open, but would like to fix it right.
I figured out that the relay puts voltage to the solenoid when key is turned on, but when you turn the starter, the voltage at the solenoid drops to zero. Thought it was the relay, but I pulled it and tested it and it works fine. Tested it with resistance measurement but then put a load on it and it still worked fine. However, voltage at the solenoid still drops to zero when the starter is running.
I can't find a wiring diagram on this machine. Have seen several and have the IT shop manual (worthless for the emissioned tractor) and the New Holland Operator's manual (also almost worthless for this tractor). No wiring diagram. Found several through this forum and I gather there is a diode that may be causing the problem but don't know where it is or what it looks like.
Dealer finally told me how to shut down the tractor without turning off the fuel. Just put it in high gear, with throttle down as low as possible, and gradually let off the clutch. Tractor will bog down and die. Sure saves priming the darn thing every time.
Still no idea why it would not shut down, but first thing first, I have to get it to running. I guess running a wire direct from the battery to the solenoid would keep it open, but would like to fix it right.