Makita HR4013C, Technical Information

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(8) As for model HR4013C , loosen four M4x16 Pan head screws and remove Switch case set from Crank housing. ( Fig. 17 )
Then, Push and Turn each Holder complete on both sides of Crank housing with a slotted screwdriver to
remove counter weight mechanism. ( Fig. 18 )
(9) Loosen four 5x25 Tapping screws and then remove Crank housing and Gear housing from Motor housing. ( Fig. 19 )
(10) Move the pin portion of Crank shaft to the closest position to Handle side. ( Fig. 20 )
Put two pieces of 1R238 on Crank shaft as drawn in Fig. 21 , then hold 1R238 to 1R306 on Arbor press.
Press down Crank shaft together with Ball bearing 6004LLU,Retaining ring S-20 and Helical gear 10. ( Fig. 21 )
(11) Connecting rod with Piston section can be removed from Cylinder side. Disassemble Piston section. ( Fig. 22 )
[3] DISASSEMBLY/ASSEMBLY
[3]-3. Crank housing, Cylinder, Counter weight (cont.)
Fig. 17
Fig. 19
Fig. 21 Fig. 22
Fig. 20
Fig. 18
Switch case set
Compression spring 11 Spring plate
Push and Turn
Holder
counterclockwise
on the left .
Push and turn Holder clockwise
on the right.
Counter weight
Holder complete
Counter weight mechanism
Crank housing complete
Handle installation side
Note
:
If the position is moved from
the closest, the pin portion will
be hooked with Crank housing
Cylinder side
M4x16 Pan
head screw
(4 pcs.)
5x25 Tapping screw (4 pcs.)
Handle installation side
Crank shaft
1R238
(2 pcs.)
1R306 Pin 7 Piston
O ring 21
O-ring 22
Connecting
rod
Arbor press
Cylinder side
28mm
Crank housing
Crank shaft
Crank section
Ball bearing 6004LLU
Retaining ring S-20
Helical gear 37