As you already know caterpillar Electronic Technician (ET) is a software part of Caterpillar diagnostic tool. It allows you to diagnose vehicle ECM and check error codes, change ECM configurations and much more. But a part of ECMs settings is locked and to unlock these parameters you will need caterpillar factory passwords.25$ 
Yale is included in following programs
Forklift Trucks + Manuals
Yale 2014 PDF Parts Manual
Electronic directory Yale 2014 PDF is parts catalog, which contains full technical information on the original spare parts, parts and accessories, intended for forklifts Yale.
|spare parts catalog||English, German||WorldWide||01/2014||200|
Yale 2014 Service Manual
Yale 2014 contains guidance on repair and maintenance, special repair manuals, instruction manuals, description of repair procedures, information on forklifts Yale.
|repair manual||English, German||WorldWide||01/2014||200|
Yale Service Manuals Class 1 2014
Service documentation for forklift trucks Yale CLASS 1 repair manual and wiring diagrams.
Spare parts catalog and repair manuals for Axcess Yale
|repair manual, spare parts catalog||WorldWide||01/1998||50|
Yale PDF electronic database is a catalog of spare parts for trucks, which includes a detailed catalog of parts and accessories trucks of all types and sizes of Yale.
|spare parts catalog||EN||WorldWide||10/2006||50|