The diesel fuel leaks through the injection plungers(i don't know the correct name for them) There is no seal, they are manufactured so precisely that the plungers can move freely but the gap between plunger and cylinder is so tight that not even the high pressure diesel can get through. If the fuel is not clean enough the plungers wear out and the diesel fuel leaks into the pump.

The big screw plug on top of the governor housing is there so you can adjust the breakaway and high idle while calibrating. The entire pump runs off the same oil, there is a hole in the back of the main housing and the front of the weight housing that allows oil to flow through it.

You are mixing 2 different lubrication systems. One version of these pumps need to be serviced manually, it always has a breather cap instead of the plug at 7:56. And the one in this video gets lubricated by the engine lubrication system, so it is basically maintenance free

kraden18 These flat head screws on each and every cylinder of the injection pump are special guide screw during installation of plunger in the injection pump housing.

The larger one is called the torque capsule. This adjusts the amount of fuel the engine gets at the torque rating. The smaller one is to be set while you are setting low idle.

Sounds like the control rack is stuck a little. The shutoff lever runs the rack, if the shutoff is constantly engaged it's more than likely because the control rings on the control sleeves aren't allowing your control rack to return all the way.

I'm not familiar with the pump on a JD 4600. If it is an inline pump like the bosch in this video, I might try checking the control rack to see if it move freely. Perhaps it has become stuck sitting for 5 years? Good Luck.

+Greg Niebergall Thanks for the response. I was able to get it running. The plungers/rack were stuck, but after some soaking, and a few taps with a wooden dowel, I was able to break them free. Now I can't get it to turn off lol. The rack is moving like it should, and the solenoid is too. I'm not usually a diesel mechanic, but its smoking a good bit, and has more knock than it should, so I'm pretty sure its running rich as well. Probably have some injectors stuck open, I'm hoping that may be why it won't turn off as well. Haven't had much time to work on it lately, but hopefully sometime in the next week I'll get back to it.

@@gniebs1 Do you know if installing a brand new governor what to do if it idles really high on startup ?

Should be self lubricating. what is it on? Different machines it was different

It’s in the governor and rack I believe

I have the same question. Had to reinstall the governor and now when it starts it goes nuts and wont idle down.

@@FrequencyOfThought you need to adjust the setscrew on the side in conjunction with the screw on top of the swiveling lever inside the weight housing. In order to get to the screw in the weight housing take off the bid screw plug on too of the weight housing

@@Matthew-hg4fm Wow thanks for the response! Somehow I ended up fixing it and it was the dumbest thing ever. A nut came loose somehow and it starts right up and idles. I now know enough from messing with it I can tune a pump by using small plastic cups and my ear. I don't even need to take it to a pump specialist.. That's how long I messed with the pump.. days and days and hours spent on it..

The small screw in the back of the pump loosen the jam nut and loosen it out(counter clockwise) I would advise doing 1/8 to a 1/4 of a turn each time and would set it where u had a little black smoke when giving it full throttle and a little smoke at a load

Very good, how do i remove spring and plungers have some rusted tight?

Sir where are you