Makita 4112S Technical Information page 4

R
epair
[3] -2. Disassembling/ Assembling Gear Section and SJS (Clutch) Mechanism
ASSEMBLING
1) When assembling Lock spring 24 to Spiral bevel gear 57, first apply Makita grease SG. No.0 to the spring.
2) Then tilt and place Lock spring 24 on Spiral bevel gear 57, and press down the portion A (the highest portion) of
the spring using arbor press. As turning the gear counterclockwise, press down the portions B, C, D sequentially.
After one turn of of the gear, the top surface of the spring will be almost flat. Lock spring 24 can now be fit on
Spiral bevel gear 57 by pressing down the entire top surface of the spring. (Fig. 12)
3) Assemble Lock sleeve to Spiral bevel gear 57 the same way as you did to install Lock spring 24. (Fig. 13)
4) Then do the reverse of the disassembling steps.
Fig. 12
Arbor press
Lock spring 24
Spiral bevel
gear 57
[3] -3. Replacing Armature
1) Separate Base and Wheel cover. (Refer to [3] -1.)
2) After removing Brush holder cap and Carbon brush, separate the Gear housing section from Motor housing
by unscrewing four M5x40 Hex bolts.
3) Armature can now be removed from Gear housing by tapping the end surface of Gear housing with plastic hammer.
Ball bearing 6202DDW still remains in Gear housing in this step.
4) In order to remove Ball bearing 6202DDW;
Remove Retaining ring R-40 and Flat washer 30, and insert the removed Armature lightly into the ball bearing again.
Then pull out the ball bearing with the inserted armature while swaying the commutator end of the armature. (Fig. 14)
5) When fastening the Gear housing section to Motor housing, tighten four M5x40 Hex bolts to the recommended
torque of 7.4 - 15Nm.
Fig. 14
Retaining ring R-40
Flat washer 30
Ball bearing 6202DDW
Fig. 13
Lock sleeve
P 4 / 6
Ball bearing
6202DDW