Makita HR4001C, Technical Information

P 16 /20 

R

epair

[3] DISASSEMBLY/ASSEMBLY
[3] -6. Brush Holder Unit

[3] -7. Field

Fig. 51

Fig. 52

DISASSEMBLING

1)  Referring to 1) to 5) of [3] -4, disassemble the Motor section.
     Note: Before proceeding to the next step, be sure to disconnect Controller
               from Brush holder unit. (Fig. 27)
2) Brush holder unit can now be separated from Motor housing by removing
    four 4x18 tapping screws, (Fig. 50)

Fig. 50

Tapping screw
4x18 (4pcs)

Brush holder unit

Guiding line on the inside
surface of Motor housing

Brush holder unit 

[Handle side]

Connector to Controller

Base portion of
Brush holder unit

ASSEMBLING

Terminals

Field cannot be installed in place on Motor if Brush holder unit is already
assembled in place.
When assembling Field to Motor housing, therefore, make sure that
Brush holder unit is not installed on Armature.

Following the steps described below, assemble Brush holder unit to Motor
housing (Fig. 51):
1) Place Brush holder unit so that the connector to Controller on the unit
    faces toward the Motor housing side and toward the Handle side.
2) Align the top surface line of the base portion of Brush holder unit with 
    the guiding line on the inside surface of Motor housing.
3) Keeping the base portion of Brush holder unit parallel to the guiding line,
    push straight into Motor housing.
4) Then fasten Brush holder unit to Motor housing with four 4x18 Tapping screws, and the terminals on Brush holder
    unit is now connected with the receptacles on Field.
Note: Be careful not to tilt Brush holder unit in any direction when pushing into Motor housing.
           Inserting tilted Brush holder unit into Motor housing will result in deformation of the receptacles on Field
           and the terminals on Brush holder unit. 

Receptacles