Bosch Power Tools 1821 manual Wire Brush Operations, Maintenance

! WARNING

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Wire Brush Operations

Wire brushes are intended to “clean” structural steel, castings, sheet metal, stone and concrete. They are used to remove rust, scale and paint.

Avoid bouncing and snagging ! WARNING the wire brush, especially

when working corners, sharp edges etc. This can cause loss of control and kick-back.

Be aware that wire bristles ! WARNING are thrown by the brush

even during ordinary operation. Do not overstress the wires by applying excessive load to the brush. The wire bristles can easily penetrate light clothing and/or skin.

BRUSHING PRESSURE

1.Remember, the tips of a wire brush do the work. Operate the brush with the lightest pressure so only the tips of the wire come in contact with the work.

2.If heavier pressures are used, the wires will be overstressed, resulting in a wiping action; and if this is continued, the life of the brush will be shortened due to wire fatigue.

3.Apply the brush to the work in such a way that as much of the brush face as possible is in full contact with the work. Applying the side or edge of the brush to the work will result in wire breakage and shortened brush life.

WIRE WHEEL BRUSH

CORRECT:

Wire tips doing

the work.

INCORRECT:

Excessive

pressure can

cause wire breakage.

WIRE CUP BRUSH

CORRECT:

INCORRECT:

Wire tips doing	Excessive
	pressure can
the work.
	cause wire
	breakage.

Maintenance

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 Authorized 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.

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