I have been given bosch psr 14,4 drill driver but no instructions and i dont know how to put it into hammer mode.

SOURCE: Broken Forward/Reverse Switch on Bosch Model 1198VSR Hammer Drill

Yes .. should find it here http://www.toolpartsdirect.com/bosch-tool-parts.html
Hope this is Helpful ! Thanks

SOURCE: Bosch 11247 Hammer drill works

Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.

SOURCE: i have a bosch rotary hammer 11245evs and it was

They are filled with a special grease that comes from Bosch. It sounds like the impact bolt or the striker pin in the unit are not moving the way they should. These are the pieces that work together to create the hitting action. About all that can be done now is the unit has to be dismantled to get those to pieces moving again. Bosch makes what they call service packs for all thier hammers. They have all the o-rings and grease to get your hammer working again. A Bosch service center can supply you with the kit. Ask for P/N 1617000225, or they can take care of it for you.
Hope this helps

SOURCE: Bosch VSR 1199 hammer drill keeps slipping in hammer mode

Inside there is a little plastic shaft, where the selector hooks to. They have had problems over the years stripping. Replacement part is still plastic. Yay! You may need a bearing puller or find some way to get the clutch off the shaft. Lemme know. Please rate me

SOURCE: how long do I charge my 18 v PSR bosch cordless

about 180 mins or an hour and a half. if the light does not change, just make sure you put it properly on the charger base and time it for charging. Disconnect it after you are done. Usually, the light on the charger is just an indication that it is powered on.