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Not sure there is a instruction manual, if you go to this web site; http://www.firehooksunlimited.net/ look for the Hydra-Ram listing and you will see a picture of it in use, keep in mind you might need a flat head axe, or a pro bar (haligan) to tap it to get it started, one or two pumps and the door should be forced.
If need be yes, but a lot of times you just stick it in the door and pump it once or twice and the door pops open.
You can also just use a halligan to tap it in as well. I see this method used more often.