Makita DDF481 Technical Information page 3

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Drill chuck (cont.)
DISASSEMBLING
(6) Set the lever portion of Gear assembly to 1st gear position. (Fig. 6)
Set Gear assembly in drill mode. (Refer to Fig. 7.)
Tighten two 921477-5 evenly while keeping 1R404-B parallel with
1R404-A, and then tighten M5x10 Thumb screw of 1R404-B. (Fig. 6)
(8) Hold 1R404 in Vise as drawn in Fig. 7.
Secure 1R298 to Drill chuck and attach 1R264 to 1R298. (Fig. 8)
(9) Turn 1R264 counterclockwise to remove Drill chuck. (Fig. 8)
Note: When it is impossible to remove Drill chuck, try the steps
with 1R359 mentioned in Makita repair tool list.
Fig. 6
Keep 1R404-B parallel
with 1R404-A.
Lever portion of Gear assembly
ASSEMBLING
Assemble by reversing the disassembly procedure.
Note: • When you turn 1R264 clockwise to assemble Drill chuck to Spindle, the tightening torque should be 65 up to 72.5
N∙m (660 up to 740 kgf∙cm).
• M6x22 (-) flat head screw is thread locker type, and therefore, apply ThreeBond 1342/ Loctite 243 to the thread
and tighten the screw using Cordless impact driver with slotted bit.
[3] -2. Gear assembly, Rotor, Stator assembly, Speed change lever assembly
DISASSEMBLING
(1) Remove nine Bind PT3x14 tapping screws and four 4x18
Tapping screw, and then separate Rear cover and Housing R
from Housing L. (Fig. 1 of the previous page and Fig. 9)
(2) Remove the following parts from Housing L at a time. (Fig. 10)
• Gear assembly with Drill chuck
• Motor section
• Speed change lever assembly
(3) Remove Speed change lever assembly from Gear assembly,
and then separate Motor section from Gear assembly. (Fig. 11)
(4) Put Rotor section on a workbench so that the drive end of Rotor
touches the workbench.
Press Stator down to separate from Rotor. (Fig. 12)
Fig. 10
Speed change lever assembly
Motor section Gear assembly
1R404-A
921477-5 (2 pcs.)
Fig. 11
Fig. 7
1R404
narrow
side
Fig. 8
M5x10
Thumb
screw
Shaft of
1R404-C
1R404-B
Fig. 9
Housing L
P 3/ 11
Set Gear assembly
in drill mode.
wide side
1R264
1R298
1R404
Vise
Rear cover
4x18 Tapping
Housing R
screw (9 pcs.)
Fig. 12
Rotor
Stator