oil pressure problem identified...question re pump

There is a small key on one of the inside gears that locks the gear to the shaft. This has been damaged and no longer locks the gear in place.

This "key" is damaged and I cannot tell whether it was a screw or was wedged in. There is a similar key on the external big gear, it looks like it has a flat screw head. But it doesn't really look like a screw....maybe it driven into place with something shaped like a flat screw driver in order to spread it out.

What were these keys, screws or wedges? Can they be replaced without having to buy a full rebuild kit? For example, can you drill them out and install a new one?

Weather has turned warm and I am looking forward to getting it running again.

thanks,

George

And be certain nothing but oil can go in the intake or you will break the rebuilt pump someday.

Gerald J.

So I looked the kit up in my MF-135 parts book. The key for the outside driven gear is a screw. Called a French Key. The book doesn't give a size. The shaft and gear inside the pump come together. They aren't supposed to come loose, so I have no hint of how they were attached. The kit includes three gears, two shafts and a bushing plus gasket and that screw and some other parts.

I don't know what would have caused the inner gear to come loose from the shaft other than not having been attached well when it was made or bushing and shaft wear have it striking the case and binding up, though a chunk of something hard in the gears would cause a great complaint.

Gerald J.

Gerald J.