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Hey everyone, first post. I have a JD 300D backhoe I bought used from a guy who had his own business, little over 4000 hours. I had a leak coming from the injection pump gear cover so I figured easy enough, ordered new gasket and replaced it. Well when I took the cover off I noticed the nut for the pump gear inside had contacted the cover and rubbed into it but I had not heard any noise and didn’t think too much of it. then I happened to notice a nut was missing off of the 3 bolts that hold injection pump to the engine. So I found a nut that would fit and tightened them all down until snug and crunk up engine and now it makes a metal screeching sound where I think the nut inside was contacting gear cover before. Any help to fix this would be appreciated it.
 

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I’ll try to add a picture after work but the 3 bolts that hold the actual injection pump on is where I added the nut to. The nut that is scraping the injection pump gear cover is on the inside and is, I’m assuming, the nut that holds the gear on
 

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It’s similar but where the IP meets the engine the bolts have a triangular pattern instead of round but overall looks very similar. The shinier nut is the one I added. The nut that was scraping was under the gear cover on opposite side.
 

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That's odd because all the inj pump schematics that I located for a JDB pump has round body held to engine block with 2 studs. Later model 301A has similar inj pump mounting held by 3 studs.
 

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Weird, I have a feeling it’s been messed with before but I actually solved the issue. The bolt holding IP gear down was half way stripped but I could flip nut over and tighten it down and it’s foxed the issue. Would anyone happen to know a good asking price for a machine like this if I was looking to sell?
 
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