Yiu can see a portion of an Ebook book I use to teach the Bsics of Hydraulics and pneumatics (Fluid Power) at www.hydraulicspneumatics.com Go to the Ebok Link.
It is only about 80% posted so far but should give you enough to work on for awhile.
Assuming that you have just started studying about Hydraulic and Pneumatic Systems, these are a few sites that I had visited when I entered College to get myself more acquainted with these concepts Hydraulic Systems hydraulic technical library Hydraulic drive system Hydraulic machinery How Hydraulic Machines Work Pneumatic systems Pneumatics
A significant disadvantage of looking for information about Mechanical Engineering topics on the Internet is that there is no single repository providing you with comprehensive information about a given topic. Information is available in bits and pieces all over :(
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Get busy living.... Or get busy dying - The Shawshank Redemption
thanx buddy ya u r true about the mechanical stuff its really difficult to get all stuff at one place thanx for the response i will go through it keep in touch and share ur thouts about the topics on mechanical engineering. thanx