JDB injection pump no fuel after cleaning and sealing

Manuel2000

New User
I tore down my Roosa Master (JD 450-C) JBD 435 MD2802 2500RPM
I did like wise to my Case 480CK DBGFCC 431 24AJ 1750 RPM

I cleaned it up. Installed a new flex ring and resealed it. It is getting plenty of fuel to the inlet. The Delivery valve looked good and was cleaned. The plunger pistons were clean and moved easily in the rotor.

I am not getting any fuel to the injector outlet ports on the hydraulic head.

I was pretty careful to keep the cam ring in c/cc position.

I'm pretty sure my metering valve is working properly, as is my fuel shut off. The JD is 12V solenoid and the Case is mechanical.

I'm hopping someone has had this problem.

I'm also wondering if one of the plunger piston in the rotor could
be blocking the Delivery Valve port?

Hope to hear back tonight or I'll be tearing them apart again tomorrow.
Thanks
 
Did you assemble the vane transfer pump correctly?

Is it filling the pump housing with fuel and returning fuel?

Transfer pump pressure forces the pumping plungers outward, taking on a charge of fuel, then they are forced inwards by the cam ring, pumping a measured amount of fuel through the delivery valve.

The delivery valve isn't likely to be causing your problem.

It's function is to retract at the end of injection, allowing the the quick, sharp end to flow from the injector, so the injector doesn't "dribble".
 
Thanks DT, I just wasn't sure if they might move far enough over if pushed to block Delivery port.

I'm at a loss. Both pumps are doing the same thing. No injector fuel.

I checked the fuel shut off on the JD solenoid with a 12 volt battery, and it seemed to be working fine. The Case shut off seems to not be able to assemble wrong.

I'm brand new at injection pumps, but am pretty mechanical. Took pictures as dissembled and have the manual for the pumps.

It seems to me that the only thing to stop fuel is, fuel shut off, metering valve and delivery valve. Am I wrong?
 
Thanks Bob. I think the vanes are assembled right. How would they assemble wrong? It seems they can only assemble one way. One with the notch up and the other notch down. Am I wrong about that? The Case has solid vanes and the John Deere has 2 piece with the spring.

Like I said, the delivery valve is free and I think working properly.

I understand that the vane pump forces the pistons out. The thought that I had was when putting them back in could I have pushed them all the way to one side and blocking the inlet from the vane pump?
 
Cam rings, and transfer pump liner are directional. Delivery valve stop screw torque is critical. JD pump turns clockwise, the 188 Case turns counter-clockwise. Older flapper type stop solenoids some times needs the throttle opened a bit for the solenoid to allow metering valve to move, late plunger type should pull in without opening the throttle..
 
Thanks again DT,
I am positive I put the JD in Clockwise and the Case in CC.

I torqued the Delivery valve to Spec.

The JD is a plunger type and seems to be working right. I checked while dissembled with a battery and can hear a solid click installed when ignition is swiched on.
I've tried the throttle full open, half open and closed on both, with no success.

I'm very confused. I thank you for all your help and would appreciate further info if anyone can help.

I have evidently screwed something up. Pulling tomorrow.
 
After sleeping on it, I've come to the conclusion that I must have gotten the pump out of time. I can't think of any reason not to have fuel at the injector ports other than the delivery port and the hydraulic head port are not lined up on compression of the plungers. Any thoughts?
 
Hey dieseltech, thanks for the reply.
I understand that the Cam Ring is directional, but I thought the rotor retainer ring simply retained the rotor retainers from displacing? Is there a up and down to it?
 
(quoted from post at 09:51:18 05/09/18) Not the retainer ring, the transfer pump LINER is directional..
I understand. I guess I will take it apart and check them out.
Thanks again for your help.
 
The cam ring for a pump with carbon veins is different from ones with steel spring loaded veins. Did you get the delivery valve out, or just the spring and button? Am I reading this right, Are both pumps not working? Al
 
Well I took it apart again. The cam and vein ring are in the correct position.
I put it back together and installed it. I'm priming it now.

Maybe I'm expecting too much. Can anyone tell me how long it should take for the injector tubes to fill and see fuel at the injector nozzles?
 
Hey Bob, before I pulled it checked it and reinstalled it, the bowl was full and it was returning fuel. A little fuel was coming out of the third line but not the others. Maybe I just did not turn it over long enough.
It makes me cringe to keep turning over a dry (top) engine.
 
I got it started today. Had to charge the battery 5 times to get enough fuel to the injectors. It's running rough. I only let it run for a few minutes. Don't know if it's still a little air in the lines or something else.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top