P 2/ 9
Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[1] NECESSARY REPAIRING TOOLS
[2] LUBRICATIONS
[3] DIFFERENCE OF GEARS BETWEEN MT902 AND MT903
[4] DISASSEMBLY/ASSEMBLY
[4]-1. Small spiral bevel gear, Armature, Ball bearings 6301ZZ and 6200ZZ
Code No. Description Use for
1R004 Retaining ring pliers ST-2 disassembling/ assembling Ring spring 15
disassembling/ assembling Retaining ring R-421R005 Retaining ring pliers RT-2N
1R027 Bearing setting pipe 18-10.2 disassembling Large spiral bevel gear from Spindle
1R269 Bearing extractor (small) removing Ball bearings
1R286
Model No.
Small spiral bevel gear
(Gear on Armature shaft)
Large spiral bevel gear
(Gear on Spindle)
Round bar for Arbor disassembling large Spiral bevel gear from Spindle
Apply approx. 70g of Makita grease N No.1 to Gear room.
Refer to the following gears. They are not interchangeable.
DISASSEMBLING
MT902
MT903
Number of teeth: 16
Spiral bevel gear 16
Spiral bevel gear 12
Spiral bevel gear 53B
Spiral bevel gear 53A
Number of teeth: 12
28mm
22mm
grooved
not grooved
1. Remove Brush holder caps and
Carbon brushes from Motor
housing.
(1) Disassemble Gear housing complete and Bearing box. (Fig. 1)
2. Remove Gear housing complete together
with Armature from Motor housing by
unscrewing four 5x35 Tapping screws.
3. Remove Bearing box section
by unscrewing four 5x35
Hex socket head bolts.
Fig. 1
Brush holder caps
Carbon brushes
Gear housing complete
Motor housing
Armature
Bearing box
section
5x35 Tapping screw (4pcs.)
5x35 Tapping
screw (4pcs.)
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