Makita HR4013C Technical Information page 10

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3]-3. Crank housing, Cylinder, Counter weight (cont.)
(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)
Fig. 17
Switch case set
Crank housing complete
Fig. 19
5x25 Tapping screw (4 pcs.)
Fig. 21
Cylinder side
Crank housing
28mm
1R238
(2 pcs.)
Crank shaft
Handle installation side
Crank section
Fig. 18
Push and turn Holder clockwise
on the right.
Push and Turn
M4x16 Pan
Holder
head screw
counterclockwise
(4 pcs.)
on the left .
1R306
Crank shaft
Spring plate
Fig. 20
Handle installation side
Cylinder side
Arbor press
Ball bearing 6004LLU
Retaining ring S-20
Helical gear 37
P 10/ 19
Compression spring 11
Counter weight
Holder complete
Counter weight mechanism
Note:
If the position is moved from
the closest, the pin portion will
be hooked with Crank housing
Fig. 22
Pin 7 Piston
O-ring 22
O ring 21
Connecting
rod