Makita Detailed Repair Instructions for Drills HP1630 and HP1631

Repair

[3] DISASSEMBLY/ASSEMBLY

P 4 / 6

[3] -3. Helical Gear 37 and Ball Bearing 6202DDW

DISASSEMBLY

1)	Remove Gear housing. Refer to page 3.
2)	Remove Pin 4 and Steel ball 3.5 from Spindle to prevent
	missing and breaking. (Fig. 6)
3)	Hook awl to inner periphery of Ring spring 12 and remove
	Ring spring 12. (Fig. 7)
4)	Put Gear housing section on 1R037 and fit 1R026 to Spindle.
	And then press Spindle slightly with arbor press. (Fig. 8)

Fig. 6

Spindle

Steel ball 3.5

Pin 4

Fig. 7

Spindle Awl

Helical gear 37

Ring spring 12

5) Put 1R283 on Spindle and push out Spindle from Helical

gear 37 with arbor press. (Fig. 9)

Note: When Helical Gear 37 is removed from Spindle,

a heavy load arises in Ball bearing 6202DDW in Gear housing section. Therefore, be sure to replace Ball bearing 6202DDW.

6)Remove Retaining ring R-35 in Bearing room, and remove Ring 12 and Ring 19.

7)Remove Compression spring 16 from Spindle and insert Compression spring in Ball bearing 6202DDW.

Strike Spindle top with plastic hammer, and Ball bearing 6202DDW can be removed from Gear housing.

Fig. 8

	Spindle end
1R026	is put in
	1R283.
Gear
housing
section

1R037

Fig. 9

ASSEMBLY

1)Complete assembling work to installation of Retaining ring R-35 in the reverse order of the disassembling steps.

2)Mount Compression spring 16 on Spindle and put a little amount of Molybdenum disulfide lubricant to Compression spring 16, and then install them to Ball bearing 6202DDW.

3)Put Spindle on 1R035 and set 1R028 on Helical gear 37, and then Press-fit Helical gear 37. (Fig. 10)

1R283 Helical gear 37

Fig. 10

1R028

1R035