Make a Bosch 11247 hammer? - Bosch 11247 1916" Spline Combination Hammer

John,
Try the following link. You may have to register, which is free, to be able to get a parts diagram.
Bosch Power Tools Contractor Tools Accessories

this 1 615 437 511 40 ml oil

And this 1 617 000 430 a special consumables kit
http://www.powertools-aftersalesservice.com/public/boschprof/service?p_auth=7NpuAYB2&p_p_auth=9xkD3xxM&p_p_id=WSRP_bc93764e__6873__4b00__9a29__b331c9759da9&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&_WSRP_bc93764e__6873__4b00__9a29__b331c9759da9_wsrp-navigationalState=L0JPUy9QVEFTLVBULVNJUy1TaXRlL25sX05MLy0vRVVSL1ZpZXdQcm9kdWN0LURpc3BhdGNoO3BnaWQ9YmI5NWI3MGRjM2E3NzQxY2ExYzA0OGYyM2IzMHVpYjMyYlY0O3NpZD12MElCS3pCTTZ4VzMwbWR6cXZzZDBEX0hxWW15eWZsWEpVT0NnTExzcVlteXliUG5QZUk9

It says on the drawing Renolin PGW150. 50ML

Top up the transmission with PAG150 oil. The Bosch stuff is hideously expensive, but it's the same as the 150-grade oil used in car a/c systems. I fill them so the oil *just* covers the big gear.

SAME ISSUE *****SOLVED*****

You were on the right track but needed to go farther with top description without disassembly!!

I have a barely used Hammer drill also that will rotate and run motor but does not hammer in any position.

Grease is the issue.....

Heat and sitting causes the grease to weep out & even a small amount of dust binds up the hammer drill.

******SOLUTION*****

GREASE, GREASE & MORE GREASE....

REMOVE BIT....SQUIRT IN ALOT OF THE BOSCH GREASE HOLD LOCKING CHUCK OPEN. INSERT A SPLINED BIT INTO THE HOLE AND PLUNGE GREASE IN SLOWLY SEVERAL TIMES. REMOVE BIT & REFILL GREASE & REPEAT.....VOILA.....HAMMER WORKING AGAIN....

BE SURE TO USE LOTS OF GREASE & DUST COVERS ON Bosch HD WHEN WORKING. WE ALL ERROR AND FAIL TO MAINTAIN FROM TIME TO TIME!

hola le hace falta aceite a los engranes por eso no golpea puedes usar aceite para transmision

Go to eReplacementParts.com : Power Tool Parts and Tool Repair

Most ac motors will run with a +/- 10%. Quick calculations say you drop will only be 2.3%. You should be just fine.

There is a clutch in the main spur wheel of the unit. These sometime begin to slip, on rare occasions they will slip to the point where the drill will not rotate. If you are interested the part number for this clutch is 1617000817.

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.