Dremel 4000 Maintenance Information, Carbon Brushes, Maintenance of Replaceable Brushes on Model

! WARNING

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Maintenance Information

Service

Preventive maintenance performed by unauthorized 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 Dremel Service Facility.

! WARNING To avoid injury from unexpected starting or

electrical shock, always remove plug from wall outlet before performing service or cleaning.

CARBON BRUSHES

The brushes and commutator in your tool have been engineered for many hours of dependable service.

In order to prepare your brushes for use, run your tool at full speed for 5 minutes under no load. This will properly “seat” your brushes, which extends the life of both your brushes and your tool.

To maintain peak efficiency of the motor, we recommend every 40 - 50 hours the brushes be examined. Only genuine Dremel replace- ment brushes specially designed for your tool should be used.

MAINTENANCE OF REPLACEABLE

BRUSHES ON MODEL 4000

The brushes should be inspected frequently when tools are used continuously. If your tool runs sporadically, loses power, makes unusual noises or runs at a reduced speed, check the brushes.

To continue using the tool ! CAUTION in this condition will

permanently damage your tool.

Follow these steps to check/change the rotary tool brushes:

1.With the power cord unplugged, place the tool on a clean surface. Use the tool wrench as a screwdriver to remove the brush caps in a counter-clockwise direction (Figure C).

2.Remove the brushes from the tool by pulling on the spring that is attached to the carbon brush. If the brush is less than 1/8" long and the end surface of the brush that contacts the commutator is rough and/or pitted, they should be replaced. Check both brushes (Figure D).

FIG. C

R

BRUSH CAP FIG. D

BRUSH SPRING

R

CURVED END OF

BRUSH MUST

MATCH

BRUSH CURVATURE OF

HOUSING

Usually the brushes will not wear out simul- taneously. If one brush is worn out, replace both brushes. Make sure the brushes are installed as illustrated. The curved surface of the brush must match the curvature of the commutator. Also check that the brush caps sit flush with the tool housing.

3.After replacing brushes the tool should be run at no-load; place it on a clean surface and run it freely at full speed for 5 minutes before loading (or using) the tool. This will allow the brushes to “seat” properly and will give you more hours of life from each set of brushes. This will also extend the total life of your tool since the commutator surface will

“wear” longer.

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