Starter/Injector pump problems

Due to unfortunate timing and "other" family obligations I just now got to put my JD450 back together.

First problem...turn the key to start and the starter spins like a mad man. (No injectors in). The problem is when you let off the key, the solonoid will not disengage. It keeps spinning. I had to cut the negative battery cable with cable cutters to get it to stop. Starter wire is on the "S" terminal. I tried it again by bypassing the key and jumped from the battery connection on the starter to the "S" terminal and removed the jumper as soon as it started to spin and it still stayed engaged. Had to disconnect ground again. ????? ?????

Second problem..I"m getting fuel all the way to the injector pump but nothing is coming out the return fitting or going out the injector lines. Took the top of the pump off. Metering valve ,shut off solonoid and everything else seems to be per the book. Am I missing something very obvious?????

In regard to the fuel injection pump - there are many things that could be wrong - if you had it apart. No insult intended - but like any mechanical device - it has to be put together correctly to work - and I don't know how far you had it apart. I would never install an injection pump without testing it first. All you need to do - is stick the pump in a vise (gently), stick a large scewdriver in the drive end - and turn the pump - while you squirt diesel fuel into the fuel-inlet with an oil-can. That's all it takes to test it. Even at the slow-speed you'll be turning it by hand, and the low-tech method of squirting fuel into it - a pump that is working correctly will prime itself and pump fuel. If it doesn't - you fix it before installing it. If it's a clockwise pump - all internals must be set for clockwise. And, if counter-clockwise, the opposite. In regard to the pump - I cannot cover all the possibilities - but - is the solenoid swing-arm adjusted correctly where is contacts the metering valve? If you didn't change it, it should be fine. Do you have the low-pressure transfer-pump section assembled correctly - spring-loaded blades installed, liner ring pointing in the correct rotation direction (it has arrows on it), cam ring pointing in correct rotation direction (again, arrows on it), delivery valve is not stuck and you've installed the delivery valve stop correctly? To be very simplistic here - fuel enters the transfer pump section (with the spring loaded blades are). From there - it travels to the metering valve port. Assuming the valve is opening - the fuel is then delivered to the high-pressure pump plungers. They get activated by the rotation of the cam ring. If all that is working - you should be getting fuel.

On the starter, that should be a replaceable solonoid? YES? NO? I know after several attempts that once its spinning, if you break the ground it will disengage. You can then reconnect the ground and it will not engage again until you jump it again. Too bad..It was just installed and on it's maiden run.....

Thanks once again for your help Sir.

To answer your questions, #1. I had the new and old metering valve side by each just to make sure they are identical. I still have all of the old parts so I'll be checking them again. #2. The delivery valve WAS free. God only knows about now. I'll be checking that too. 3. Everything was out. I put in a new modified weight retainer and governing spool. What I did NOT do is back off the adjustments on the spring plates that adjust the rollers. I also did not adjust the automatic advance. Those settings are the original. The new end plate is also a modified type that is supposed to aid in low pressure pickup.

I'm positive it will be some small pain in the rear thing just because it knows my hands are old and the weather is getting colder. LOL.

Thanks again.. Chip

On the General Electric T700-701C turbines I work on, there is what is known as an HMU.. Short for Hydro Mechanical Unit. Basically a computer/electronic controlled fuel delivery system with hundreds of moving parts. It has to be so precise that if anything goes wrong with the power settings the HMU has to go back to the manufacturer for service or adjustment. Mine will be something like the rubber plug stuck.

On the way home and after reading your last post, I am going to tear down the pump again and go thru each step again. New gaskets are cheap.Pumps aren"t. And the more I think about that 50/50 mix, the more I like it. Count your blessings that I don"t live just down the road from you. You"d have company for supper tonight. LOL. Chip