Hydraulic cylinders come in all shapes and sizes, so you will need to know what you are going to use them for in order to know where to start looking for the type you need. For instance, if you are going to make use of a hydraulic cylinder on your car you will go to a car parts store or auto repair supplier in order to find the piece for your car.
This is to say that all the cylinders out there are made differently, because they are made to do specific things, so you need to be sure that you are buying the right part for the job at hand. The first thing that most people will look is the yellow pages. This is a good place to start, but you need to know that there are online yellow pages too, and the internet is the perfect place to start looking, especially if you want to know how to rebuild hydraulic cylinders.
There are a number of guides online for just about anything, but if you are going to pay for one you will need to make sure that you are getting the one that you need. Make sure that the title specifies what type of hydraulic cylinder it shows you. If the title does not specify, be sure to send the seller of the guide an email to find out.
While you are waiting for the reply to your mail be sure to check out the blogs. There are a number of people out there sharing information about services and tools they have bought online. If you were to find a mechanics blogs you may come across an article or two about the person you have emailed about that guide you were going to buy.