newbie JD 510 injector pump help

hope this is the right place to post. i have a john deere 510 3 cylinder diesel tractor that purred like a kitten and then just shut off. there is fuel to the injector pump but no fuel to nozzles. i removed timing cover on pump to line up marks (roosa master) but no matter how much i turn it , i don"t see the second mark (governor mark i think) to line up. i looks as if the forward part is not turning. i believe it is suppose to turn. any tips would be helpful. i want to pull the pump off , but i would like to line the marks up first. also is there a sure way to determine if i am at TDC (compression stroke)using the flywheel pin besides pulling the valve cover and looking at the valve position? thanks in advance.

bruce

The injection pump driveshaft may have broken.

It is "necked down" in an area around it's midpoint so it breaks when the hydraulic head seizes (sort of like a fuse blowing).

(Or, it's POSSIBLE the last pump shop guy forgot to scribe a timing mark on the governor damper ring.)

You ARE seeing the stationary timing mark on the cam ring, correct?

thanks for your input, yes i see the stationary mark. can i go ahead and pull the pump and set up timing later (supposing i find the problem)? i am thinking adjust the engine to TDC and pulling the pump to have a look. if i don"t "move" the engine i am thinking i can line up the marks on the pump and re-insert it and it will be timed. is this correct?

I would set the engine to TDC before pulling the pump. No reason NOT to. Take a peek at what the rocker arms are doing or pull the #1 injector to determine when it is coming up on #1 TDC of the compression stroke.

you were bang on Bob. i did my virgin (first time for everything)removal of the injector pump and sure enough the shaft was busted right where you said it would be. now i gotta hit the NET and hit the BOOKS to figure out how i am going to fix this now. thanks again for your insight.

bruce

The broken shaft is likely a result of a seized "head", usually caused by water or debris in the pump. BIG bucks!

Hate to bring an old thread back from the dead, but in the off-chance that someone who's successfully taken that Roosa Master injection pump out is still reading these boards, how on earth did you get the pump shaft out from the timing gear? From the parts blowout it looks like its just a tapered shaft with a D-shaped key holding it in, but I've gotten everything off this tractor except for the timing cover (which I really don't want to do unless absolutely necessary!) and removed the pump itself, leaving just the shaft dangling out still stuck in the gear... All the pounding I've done so far hasn't budged it a bit! I've put the nut (#2 in the pic below) flush with the end of the keyed shaft (#36 & #4) and smacked it pretty good with a 3lb mallet, but I'm afraid to hit too hard in case I break that $350 gear! Not sure that I should heat it either for the same reason, not to mention that its covered in oil.... Could I get the key out perhaps? Given the shape I don't see how, but I'm right out of ideas at this point :?
Or maybe someone else has run into this particular design and successfully removed it without putting a puller directly on the gear (which I can't do unless I remove the entire timing cover)

Thanks,
Dan


P.S: Hmm, looks like i can't post images yet I'll get it up ASAP.
If you want to cut&paste the URL, the image is ytforums.ytmag.com/photos/7094.jpg