Bosch Power Tools 400 Series XPR manual Maintenance, Carbon Brushes

MAINTENANCE

!		WARNING	Preventative maintenance
			performed by unautho-
rized personnel			may result in misplacing
of internal wires and components which
could cause serious hazard. We recom-
mend that all tool service be performed
by a Dremel™ Service Facility.
!		WARNING	To avoid injury from unex-
			pected starting or electri-
cal shock, always remove plug from wall
outlet before performing service or clean-
ing.		Carbon Brushes
The brushes in your tool have been engi-
neered for many hours of dependable serv-
ice.
To prepare the brushes for use, run the tool
at full speed for 5 minutes under no load.
This will properly “seat” the brushes, and
extend the life of the tool.
To maintain peak efficiency of the motor,
examine the brushes for wear every 40-50
hours.			Using the tool with worn
!		CAUTION
			brushes will permanently
damage the m			otor.
Use only original Dremel™ replacement
brushes.’
Inspect the rotary tool brushes after 40-50
hours of use. If the rotary tool runs erratical-
ly, loses power, or makes unusual noises
check the brushes for wear and possible
replacement. Remember: brushes in the
rotary tool are similar to oil in a car; the more
you check/service, the better the perform-
ance.
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 to pry up and release the clip on
	the brush cover (Figure A).
2. Remove the brushes from the tool by
	pulling the shunt and brass clip which
	are attached to the brush (Figure B).			clip
NOTE: Be sure to note how the brass

slides out of the slot next to the brush pock- et. Also, note how the detent on brass clip fits into brush pocket slot, which secures the brass clip into proper position.

3. Check each brush for wear. If brush is less than 3/8" long, or if contact end is rough or pitted, replace the brush.

A

2

4

Removing Brush Cover

B

Removing/Inspecting Brushes

C

"V" Notch

Installing Brushes

14