Makita 3709 Technical Instructions page 2

R
epair
CAUTION: Be sure to unplug the tool and remove the bit before maintenance or repair.
See the instruction manual on how to handle the tool.
[1] NECESSARY REPAIRING TOOLS
Part No. Descriptions
1R269 Bearing Extractor
1R280 Round Bar for Arbor 6-50 For use it together with 1R269
[2] Disassembling Armature
1. Remove Brush holder caps, Carbon brushes, Collet cone, Collet nut and Trimmer base ass'y set as shown in Fig.1.
2. Remove four 4x35 Tapping screws. Next, separate the assembled part of Motor housing complete and Armature ass'y
from the others. Refer to Fig.2.
3. Pull out Armature ass'y from Motor housing complete by hand as illustrated in Fig.3.
4. Remove Ball bearing 6002LLH on the drive end of Armature ass'y and Ball bearing 607LLB on the commutator end
in according to the following manner.
A) Pull off Rubber ring 19 on Ball bearing 607LLB by hand.
B) Insert two jaws of 1R269 between Ball bearing 607LLB and Resin washer to remove Ball bearing 607LLB
as described in Fig.4.
C) As illustrated in Fig.5, use 1R280 with 1R269 to remove Ball bearing 6002LLH.
Fig.1
Carbon Brush
Brush Holder
Cap
Trimmer base
assembly set
Fig.3
For removing Ball bearings on Armature shaft
Brush Holder Cap
Carbon Brush
Collet Cone
Collet Nut
Fig.4
1R269 Bearing Extractor
Ball Bearing 607LLB
Resin washer
Purpose
Fig.2
Armature ass'y
Motor Housing
Complete
Tapping screw 4x65: 4pcs.
Fig.5
1R280
Round Bar
for Arbor 6-50
Ball Bearing
6002LLH
P 2 / 4