Makita JR3050T Technical Information page 8

R
epair
[3] -5. Gear Complete
DISASSEMBLING
1) Separate gear housing from gear housing cover as described in 1) to 3) of [3] -3.
2) Remove two gear plates from gear housing by unscrewing four M5x14 torx countersunk head screws (adhesive-coated)
with Torx bit VT-25 (No.1R314) or Torx screwdriver T25H120 (No.1R327). (Fig. 20)
Then remove gear complete from gear housing. (Fig. 21)
Fig. 20
Gear plate
(2 pcs)
Gear complete
3) Put gear complete on Pipe 30 (No.1R232), and place
Round bar for arbor 16-100 (No.1R245) on needle
bearing 1216. And press out needle bearing 1216
as illustrated in Fig. 22.
ASSEMBLING
Do the reverse of the disassembling steps.
Note:
1. Before assembling gear complete to gear housing,
apply about 1g of Makita grease N No.1 to flat washer 18
and pin 12 respectively. ( Refer to Fig. 20.)
2. Apply adhesive to four M5x14 torx countersunk head screws.
[3] -6. Replacing Armature
1) Remove carbon brushes, shoe and insulation cover.
2) Remove gear housing cover from gear housing as described
in 1) to 3) of [3] -3.
3) Separate gear housing from motor housing by unscrewing
four M5x35 tapping screws.
4) Remove baffle plate from gear housing. then remove
armature from gear housing by removing three M5x10 pan
head screws (adhesive-coated) with impact driver. (Fig. 23)
In this step, ball bearing 6001DDW and bearing retainer are
still assembled to armature.
Note: Apply adhesive to three M5x10 pan head screws
when assembling.
5) Remove retaining ring S-12 from armature using Retaining ring S and R pliers (No.1R291), then ball bearing
6001DDW using Bearing extractor (No.1R269). Now bearing retainer can be removed from armature. (Fig. 24)
Fig. 24
Retaining ring S-12
Fig. 21
Torx countersunk Gear complete
head screw M5x14
(4 pcs)
Flat washer 18
Fig. 22
Gear complete
Fig. 23
Pan head screw M5x10 (3 pcs)
Pin 12
Arbor press
No.1R245
No.1R232
Bearing retainer
Bearing retainer
Ball bearing 6001DDW
P 8 / 12
Needle bearing 1216
Needle bearing 1216
Armature