1979 jd 450c track loader hard to start

[Chris2026]

Hey Guys I replaced my injection pump on my 79 450c track loader now it's hard to start for some reason even after I spray with starting fluid. It runs the batteries down and I have to put jumper cables on it. After about a hour of trying it starts to fire and then will start and run fine. Any suggestions on what to check? Thanks

[Jim B]

Out of time?

How did you remove and replace the injection pump? Did you time it before pulling the pump?

what is the replacement pump? Used, rebuilt?

[Chris2026]

Hey buddy yes we put it in time before we took the old pump off. It's a rebuilt pump from Diesel pro in PA.

[Jim B]

I would start by talking with the shop that it came from and see what they have to say. A vendor should get the first call when there is a problem with their product. That is the best way to keep any warrantee there might be.

When you timed it before pulling the old pump did the timing marks in the pump window line up?

Did you pin (timing pin) the flywheel?

Does the pump drive shaft have a dot on one side of the tang at the end of the shaft? Did the mating slot in the pump have a dot on one end of the slot? Did they line up when the pump was installed?

Did you blow out/the fuel return lines back to the tank to be sure it was not plugged?

New check valve on the return line or reused old one?

Did you bleed the system including cracking the high-pressure lines at the injectors, while cranking the engine, to clear air from those? This should be a non-issue after it started and ran for a few minutes.

Is the shut of solenoid getting good constant power when the key is on?

Look carefully at the top of the injection pump. There should be a small strap or wire from one of the electric fuel shutoff terminals (opposite the stud the power wire is on) to a screw on the pump body. I have seen a couple of the straps break (showed as a crack in the strap) and cause intermittent operation of the shutoff solenoid as the ground was lost.