2520 Injection Pump Fuel Solenoid Sticking

40JDG

Member
I have a 69 2520 Diesel and the fuel shut off solenoid in the injection pump seems to be sticking, it has the big pump like the 72 models. If it sits for a few hours it will start rite up, but if i shut it off and try to start it you can not hear the little click from the pump and it will not start. If i give it a light tap with my pliers on the top of the pump it will fire rite up every time. Is my solenoid junk or is there a connection problem, also if it is the solenoid can i replace it by taking the top cover of the pump off? Thanks
 

Yes you can replace it easily by pulling the cover off the top of the pump. JD has a newer, better design IMO that has a small plunger. The plunger connects to the flap and when it magnetizes the plunger pulls the flap in. I have replaced several now and you can really hear them click. Just not a cheap little part.
 
Ever try some fuel additive that lubricates or just some 2 cycle mixing oil in the fuel? Sounds like the metering valve is sticking a bit......Ron
 
If you have the early type flapper solenoid try opening the throttle a bit. The internal spring on the linkage bar will then help the solenoid turn on when hot, which is sometimes needed with the old type. New type plunger solenoids will work with the throttle left at idle. The new type can be installed in your cover, but some machining is needed inside the cover before it will fit.
 
We have a 69 2520 also,. We usually put fuel additives in and I always start it at 1/4 throttle. I don't know if the injection pump was changed when my uncle put the 239 engine in but after 5,000 hours we have had no problem. Since I said that it won't start tomorrow!
 
Thanks a lot for the tips. I usually always leave it at idle when i start it so i will try giving it a little throttle and a fuel additive Thanks. Nick
 
I would not say the old "flapper" solenoid is any worse then the new "plunger" type. The newer plunger type can get stuck too. Even more prone to it since debris can get stuck in the plunger.

There is NO direct mechanical connection between the solenoid and the fuel valve that turns on your tractor. So, there is no way to know if the problem is actually the solenoid or just linkage until you pull it part to look. All the solenoid does when turned "on" is get out of the way so a spring can turn your pump to "run" position.
 
Here are three versions of solenoids that show how they changed a little over time.
a229525.jpg
 
Metal from weight retainer pins beating because of
plasticast retainer missing will collect on the
solenoid. Possibly you can just clean it.
Problem is the pump will need to be disassembled to
replace retainer.
 

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