JD 4600 injection pump

[mflippin]

After tractor runs at working temp for a while it will not restart after it is shut off. Problem is the fuel shut off solenoid on the end of injection pump fills with motor oil. The guy at the pump repair shop says that the oil level in the pump should not get high enough to get in the solenoid. Anybody seen this problem?

[Tx Jim]

Does oil in inj pump require changing similar to piston type inj pump on Ford tractors?? It's possible inj pump crankcase oil is getting contaminated with diesel fuel from one or more of the inj pump plungers that are leaking fuel

[mflippin]

No sir, Oil is supplied from crankcase as continious flow.

[Tx Jim]

No sir, Oil is supplied from crankcase as continious flow.

Then it appears to me that what ever valve/orifice that is intended to maintain correct inj pump lube oil capacity is malfunctioning.

[mechanic327]

Oil getting to this solenoid is not a problem, it is very common. The problem is the thermistor. Solder in a new one and problem is gone. On the ten series JD did away with thermistor because of this problem and went with a plug in fuel solenoid relay in fuse box.

[mflippin]

Thanks for the info but where is the thermistor?

[jd110]

The thermistor is located on the back side of the fuse box. Unbolt the fuse box and pull it out. It is soldered into the wiring. It is orange in color and looks like a Chicklet piece of gum.

[mflippin]

Thanks for the help!