Makita HM0860C Technical Information page 5

(5) Separate Rear cover from Motor housing by removing
four M4x18 Tapping screws as in Fig. 8.
(6) Remove Fan 76 as described below;
Holding Fan by hand, turn M6 Hex. nut located under
Fan 76 counterclockwise with an M10 hex socket attached
to Makita impact driver.
Caution: Be sure to wear gloves when you hold Fan 76
on removing M6 Hex. nut, or Fan 76 could
injure your hand.
(7) Armature assembly can be separated from Motor housing complete by removing four 5x25 Tapping screws that
fasten Crank housing to Motor housing complete.
Armature assembly will be removed from Motor housing complete together with Crank housing. So remove
Armature assembly from the Crank housing by knocking on the end of Crank housing with wooden or plastic
hammer.
(8) Remove Ball bearing 6201LLU and Sleeve 12 from Armature assembly at the same time using Bearing
extractor (1R269).
(9) Remove Ball bearing 608DDW and Insulation washer from Armature assembly at the same time using Bearing
extractor (1R269).
<6>-2. Reassembling Armature Assembly
(1) After setting Flat washer 12 in place, press-fit Ball bearing 6201LLU to the drive-end of armature shaft using
Bearing setting plate 12.2 (1R034) and arbor press. (Fig. 9)
Note: Don't forget to set Flat washer 12.
(2) Gently press-fit Sleeve 12 to the drive-end of armature shaft using Bearing setting plate 12.2 (1R034) and arbor
press. (Fig. 9)
Fig. 9
(3) Gently press-fit Insulation washer and Ball bearing 608DDW to the commutator end of armature shaft
using Bearing setting plate (1R034). (Fig. 10)
Fig. 10
(4) And then fix Armature assembly to Crank housing.
Do the reverse of the procedure described in "Disassembling Armature Assembly" in page 4 to 5.
Ram of arbor press
Flat washer 12
Ball bearing 6201LLU
Table of arbor press
Bearing Setting
Plate 12.2
(1R034)
Fig. 8
Motor housing
4x18 tapping screw
(4 pcs.)
ø12.2mm
(1/2")
Bearing Setting
Plate 12.2
(1R034)
Insulation washer: The end with smaller periphery
Ball bearing 608DDW
P 5 /14
Rear cover
Sleeve 12
must face the direction of Ball
bearing 608DDW as illustrated.