“Unit Used On” Index

Is there a reference that identifies what piece of equipment a certain part number applies to?

The reference you are describing is called the “Unit Used On” index. The version I have is on micro-fische. The index was originally printed in booklet form like the “Master Price List”. Updated versions were issued periodically as new part numbers were issued. I suspect this document is now an online document dealers have access to.

The index was originally printed in booklet form like the “Master Price List”. Updated versions were issued periodically as new part numbers were issued. I suspect this document is now an online document dealers have access to.

The third booklet dealers had was the “Parts Substitution List”. It listed new part numbers for parts as they were upgraded, or in the case of assemblies, converted to individual part numbers. Dealers usually had these three books under the counter.

The problem with the Parts Substitution list was MF would often change the number of a part in a new edition of a parts book with no reference to the old part number, and no cross-reference in the Parts Substitution List.

This is why old editions of parts books are so valuable. As a result MF dealers have parts under the old part number on their shelves, and when they look up the part in a parts book they only find the new part number. Those obsolete parts were scrapped or sold to an NOS Parts dealer like The Depot. Some of these parts languish in dealer’s parts bins collecting dust. There they wait until guys like me with old parts books do a dealer search for the old part number through the MF dealer locater system, or The Depot’s stocks to locate those hard to find no longer available MF parts.