Try just stopping and starting the machine off a while.to see if the hammer appears.
SOURCE: Hi.I have a Hitachi H45MR.
Your hammer uses an air cushion created by drive piston to move a driven piston which contacts a second piston or striker. The second piston or striker is the part that contacts the bit. The striker can become restricted from moving to its full limits by debris or just worn slightly shorter (the part of the bit that enters the gun can wear shorter also ). Lack of movement due to debris or shorter length due to wear will cause weak hammering action. Assuming the bits are not worn where they enter the gun, as you push the bit all the way in into the chuck, the bit moves/pushes the striker into position close to the driven piston. The driven piston receives its power/movement from good vacuum between the driver piston. Good vacuum is created when there is good contact with orings to cylinder and good clean lubrication (Use Hitachi gear/hammer grease). As the grease heats up, it will run out of the cylinder. Good clean grease will remain in cylinder even after heavy use. Dirty grease and loose orings will loose power/vacuum to driven piston. You stated that you have different hammering action depending on position indicating that pistons are loose in their cylinder. The hammer should be stored with the nose pointing downward after use so that the driven piston will stay at the end of the cylinder and not slide against the driver piston (when the grease is hot, the driven piston can slide against the driver piston and will take longer to begin hammering).
SOURCE: complet break down of makitia demo hammer
Go to http://www.makitatools.com/en-us/Modules/Home/Default.aspx, put your model number in the search box and hit the arrow or enter. Select your tool and the parts breakdown and owners manual will be available to view or download. The owner's manual has their recommended lubrication requirements.
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