P 2 / 6
R
epair
[2] LUBRICATION
Put approx. 50g of Makita grease N. No.1 in the gear room of Gear housing complete to protect parts and product from
unusual abrasion.
[3] DISASSEMBLY/ASSEMBLY
Important: Different gears are used for MT900 and MT901, and they are not interchangeable between the models.
Be careful not to confuse them. refer to the following table for detailed differences.
[1] NECESSARY REPAIRING TOOLS
CAUTION: Remove the wheel from the machine for safety before repair/ maintenance !
Model No.
No load speed: min-
1
MT900
8,500
6,600
Spiral bevel gear 16
Spiral bevel gear 53B
Spiral bevel gear 53A
Spiral bevel gear 12
MT901
Small spiral bevel gear
(Gear on Armature shaft)
Large spiral bevel gear
(Gear on Spindle)
Number of teeth: 16
Number of teeth: 12
Number of teeth: 53
Number of teeth: 53
1R048
Drill chuck remover 11
Removing Spiral bevel gear 53
1R049
Drill chuck remover 15
Removing Spiral bevel gear 53
1R269
Bearing extractor
Removing Ball bearings
1R005
Retaining ring R pliers
Removal/installation of Retaining ring R-42
Assembling Spiral bevel gear 53
1R165
Ring spring setting tool B
Code No.
Description
Use for
grooved
not grooved
[3] -1. Armature, Small spiral bevel gear, Ball bearing 6301ZZ
Fig. 2
DISASSEMBLING
Fig. 1
Hex nut M8
1) After removing Carbon brush, separate the assembly of Gear housing complete with Armature from Motor housing
complete by unscrewing four M5x45 tapping screws.
2) Separate Bearing box from Gear housing complete by unscrewing four M6x22 Hex socket head bolts.
3) With Armature securely held by hand, remove Hex nut M8 from the drive-end of Armature shaft by turning
counterclockwise with wrench 13. (Fig. 1)
4) Hold Small spiral bevel gear by hand, then pull off Armature from Gear housing complete. (Fig. 2)
Note: If it is difficult to pull off Armature by hand, do the following steps.
1. Lubricate small spiral bevel gear and Armature shaft with spray lubricant.
2. Wrap the gear with cloth to protect the gear teeth.
3. Using water pump pliers or the like, firmly grip the gear wrapped with cloth, then turn the gear.
Gear housing complete,
viewed from the wheel
installation side
MT900: Spiral bevel gear 16
MT901: Spiral bevel gear 12