Bosch Power Tools 11258VSRC manual Maintenance, Service

BM 1619P00836 12-06 1/5/07 9:43 AM Page 10

You will extend the life of your bits and do neater work if you always put the bit in contact with the workpiece BEFORE pulling the trigger. During operation, hold the drill firmly and exert moderate, steady pressure. Too much pressure at low speed will stall the hammer. Too little pressure will keep the bit from cutting and cause excess friction by sliding over the surface. This can be damaging to the drill and bit.

Shanks of all drill bits should be wiped clean prior to using and immediately after removing.

Recall these instructions for safe operation:

1. Some materials require slow drilling speeds; whereas, others require higher speed to produce the best results.

2. All work must be supported or secured before drilling and steady, even pressure applied in line with the drill bit.

3. As the drill bit cuts through the opposite side, reduce the pressure and continue running the drill as the bit is withdrawn.

Materials such as glass, porcelain, ceramics, tiles, plastics, etc., should be drilled at low speeds with specially designed drill bits and lubricants.

DRILLING WOOD OR PLASTIC

If backing block is not used, ease up on the pressure just before the bit breaks through the wood to avoid splintering. Complete the hole from the opposite side immediately after the point breaks through. If bit binds, reverse the drilling operation to help remove the bit from the work.

DRILLING METAL

Make a center punch in the material for easier starting. Use enough pressure to keep the bit cutting. If the bit is allowed to merely spin in the hole, it will become dull within a short time. When drilling a larger hole, it is faster and easier on your power pack to first make a smaller hole and enlarge it to the required size. Lubricate the tip of the bit occasionally with CUTTING OIL for easier metal drilling. If bit binds, reverse the drilling to help remove the bit from the work.

DRILLING MASONRY

Use carbide-tipped masonry bit for cinder block, mortar, common brick, soft stone and other materials. The amount of pressure to be used is dependent upon the type of material being drilled. Soft materials require less pressure while the hard materials need more pressure to prevent the drill bit from spinning.

			Service	Maintenance			CARBON BRUSHES
			Preventive maintenance			The brushes and commutator in your tool
	!	WARNING
			performed	by unauth-		have been engineered for many hours of
orized personnel may result in misplacing						dependable service. To maintain peak
of internal wires and components which						efficiency of the motor, we recommend every
could cause serious				hazard.	We	two to six months the brushes be examined.
recommend that all tool service be performed						Only genuine Bosch replacement brushes
by a Bosch Factory Service Center or Autho-						specially designed for your tool should be
rized Bosch Service Station.						used.	BEARINGS
		TOOL LUBRICATION
Your Bosch tool has been properly lubricated						After about 300-400 hours of operation, or at
and is ready to use. It is recommended that						every second brush change, the bearings
tools with gears be regreased with a special						should be replaced at Bosch Factory Service
gear lubricant at every brush change.						Center or Authorized Bosch Service Station.
						Bearings which become noisy (due to heavy
						load or very abrasive material cutting) should
						be replaced at once to avoid overheating or
						motor failure.

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