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Makita HR4000C Technical Information page 3

40mm rotary hammer
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3)How to replace the armature
a. Lower the chuck cover and remove the tool
holder cap.(See the figure 4.)
b. Remove the pan head screw, and then remove the crank
housing cover and gear housing cover.(See the figure 4.)
Tool holder cap
Chuck cover
Pan head screw
Gear housing cover
Crank housing cover
e. Remove the screws for holding the fix rod, and then pull
out the fix rod and the pick up coil.
Note) Pulling out the lead wire of the pick up coil without
removing the fix rod may cause the short-circuit.
(See the figure 7.)
f. Pull out the 3 pieces of terminals
(white, black and red).(See the figure 6.)
g. Remove the rear cover and loosen the nut
while holding the fan.(See the figure 7.)
h. Remove the fan and disconnect the 4 pieces
of hexagon-holed bolts for holding the crank
housing. (See the figure 7.)
i. Strike the rear of armature shaft to disconnect
the gear housing and armature from the motor
housing.
White Red
j. To assemble the armature, insert it after the ball bearing
6201 and the oil seal 14 are pressed into the gear housing.
(See the figure 9.)
Figure 4
Controller
Black
Figure 6
c. Remove the hexagon-holed bolt and then remove the
handle.(See the figure 5.)
d. Remove the connector white and black.
Black
Controller
White
Connector
Gear housing
Fan
Hexagon nut
Rear cover
Ball bearing 6201
Oil seal 14
Buckle plate
(See the figure 5.)
Handle
Hexagon-holed bolt :
6-piece
Figure 5
Hexagon-holed bolt
Crank housing
Motor housing
Controller
Lead wire
Screw
Fix rod
Pick-up coil
Figure 7
Gear housing
Apply the grease
Armature
Figure 8

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