Looks like these manuals are hard to come by... one of the augers won't turn, I likely need a new shear pin, but maybe other parts as well - really need a manual to be able to get the right parts. Any help would be greatly appreciated!

Hi,
They can be extremely difficult because of ownership changes. Parts breakdowns are more common in three places if looked up as a Murray.
The model number is assuredly a requirement. Could be a 8 digit number hyphenated between the 4th and 5th digits or have an alphabetic character and a 7 digit number.
Peace,
Clarke