We are planning to implement SAP-PM. I have only come across old SAP R/3 manual; however, I suggest you please go through the SAP demo/tutor by visiting the website:
http://help.sap.com/bp%5Futilitiesv1500/UTL%5FIndia/html/In above website, please select, Business Information. Then select, Preconfigured Scenarios. Then select scenarios like U70. Then download the required software before playing the tutor. There is a word document that supports understanding the tutor.
Scenarios
U70: Complete Order Process
U71: Equipment Construction Management
U72: Preventive Maintenance
U73: Overhaul Management
U74: Refurbishment Management
U75: Work Clearance Management
U76: Reliability Centered Maintenance
U77: Raw Material (Coal) Procurement
Regards.