4400 compact utility

[kodiak4012000]

The tractor has been sitting unused for a few years. I have fuel going in and coming out of the return on the injector pump. The fuel shut off solenoid clicks hard like it's working, but no fuel comes out of the injector line ports. Something is obviously stuck, frozen up with the fuel shut off in the injector pump. Is there any way to unstick it without removing the injector pump. Dealership wants $1300 to R&R the injector pump.

 

[super55]

Before you jump all the way to the injector pump make sure you are getting fuel all the way up to it. As far as I know the injector pump does not have a shutoff the system relies solely on the fuel shutoff solenoid.

Before the high pressure pump there is a low pressure pump that feeds up to it. Make sure thats getting fuel. The JD shutoff has two hold in relays in it. One is to help initiate and then shuts off to keep the thing from burning up. The shut off solenoid is well known for failing so make certain that it is functioning properly and you are getting fuel up to the injector pump.

 

[beenthere]

Welcome to TBN
Send a pm message to thepumpguysc. He has shown a lot of expertise as well as has been very helpful to TBN members.
You also can look at the threads and posts to read what he has posted. May find your answers there as well, and also enjoy his knowledge.

thepumpguysc

www.tractorbynet.com

 

[kodiak4012000]

Super 55, I have fuel out of the filter into the lift/primer pump, Fuel out of the primer pump, Fuel into the injector pump, and Fuel coming out of the return line on the injector pump, but not where the injector lines come out of the injector pump. That leads me to believe that whatever mechanism that shuts off the fuel to the injector pump is stuck closed. Before I throw a bunch of money at it I would like to better understand how the fuel shut off works on this particular injector pump.

For instance does the solenoid push or pull? It has a very hard click when you switch on the key leading to believe that it's working partly anyway. I need like a cut away of the pump to better understand its function.

 

[super55]

When the key is in the run position it energizes two winding sets to get the solenoid to retract open. After it is open only the "hold-in" circuit stays energized to keep the solenoid from burning out. You should be able to remove the shut off solenoid and turn the key to the run position and visually see the plunger retract and hold once the key is turned.