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Maintenance – Bosch 11258VSR User Manual

Page 10

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Service

Preventive maintenance

performed by unauth-

orized personnel may result in misplacing

of internal wires and components which

could cause serious hazard. We

recommend that all tool service be performed

by a Bosch Factory Service Center or Autho-

rized Bosch Service Station.

TOOL LUBRICATION

Your Bosch tool has been properly lubricated

and is ready to use. It is recommended that

tools with gears be regreased with a special

gear lubricant at every brush change.

CARBON BRUSHES

The brushes and commutator in your tool

have been engineered for many hours of

dependable service. To maintain peak

efficiency of the motor, we recommend every

two to six months the brushes be examined.

Only genuine Bosch replacement brushes

specially designed for your tool should be

used.

BEARINGS

After about 300-400 hours of operation, or at

every second brush change, the bearings

should be replaced at Bosch Factory Service

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.

!

WARNING

Maintenance

-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running the drill as the bit is withdrawn.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.

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

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