JD 2440 won't shut off

[NEPA ED]

My 2440 won't shut off by pulling the injector pump shut off leaver. I opened the top of the injector pump and found the shut off cam (J shaped clip) laying in the pump. I can't seem to put it back on. It's supposed to snap back in place but doesn't snap in. It doesn't look bent and it's not broken. What could be wrong?

 

[wore out]

NOT sure why it would snap out of place, but I've heard of that before.

To put back, it must be oriented correctly, there's a partial slot in the shaft where the flat part of the "J" must fit against the flat area in the slot.

Once it's properly lined up it takes a pretty good push to snap it into place.

DISCLAIMER: A mistake in that area of the injection pump could cause uncontrolled overspeeding and not being able to shut it down! Proceed at your own risk! Consider having a little board or HEAVY rag that could be used to choke off the air supply should it "run away", and have a plan in advance as to how to do that.