Makita HM0870C, HM0871C dimensions Cylinder section can be assembled as illustrated in . Fig

P 11/ 17

Repair

[3]DISASSEMBLY/ASSEMBLY

[3]-5 Crank shaft (cont.)

ASSEMBLING

(1) Assemble Crank housing section as illustrated in Fig.s 23.

Be careful that Crank shaft of HM0870C is different from that of HM0871Cas illustrated in Fig. 24.

(2)Assemble Piston to Crank pin while referring to the right illustration in Fig. 16.

(3)Assemble Air pipe, Seal ring and Crank cap. And secure them with M4x18 Pan head screws. Refer to the left illustration

in Fig. 16. Fig. 23 Fig. 24

Retaining ring R-40

Ball bearing 6203LLU

Wave washer 30

Crank housing

Set the above parts

in place.

[3]-6 Cylinder section

HM0870C		HM0871C
17mm	Center of	17.5mm
	Crank shaft
	Center of
	Crank pin

ASSEMBLING

(1)Cylinder section can be assembled as illustrated in Fig. 25. Fig. 25

Assemble Cylinder guide to Cylinder 32 so that O ring 46 side of Cylinder guide faces Crank housing side.

O ring 46
	Crank housing
Cylinder guide	Side
Cylinder 32

Align the six protrusions of Guide ring to Slide sleeve and assemble Guide ring to Slide sleeve.

Six protrusions

Slide sleeve

Guide ring	Crank housing
Cylinder 32	side

(2)When assembling the parts which accept Impact bolt, put them into Guide ring as illustrated in Fig. 26.

Fig. 26

Ring 20	Rubber	Guide ring
Impact bolt	ring 20	Flat washer 23

Note: Ring 20 has to be assembled so that its inner side can be fit to Impact bolt as illustrated right.

Note: Rubber ring 20 has to be assembled so as to contact closely to Ring 20 without any gap.

(3)Assemble Cylinder section to Barrel as illustrated in Fig. 27.

(4)Assemble Flat washer 34 into Crank housing, and then assemble Barrel to Crank housing as illustrated in Fig. 28.

Fig. 27

Insert Cylinder section into Barrel.

Insert Striker into the Cylinder so that the protrusion of Striker faces Tool holder side.

Barrel	Cylinder section Protrusion
	of Striker

Tool holder

Fig. 28

Flat washer 34

M6x25 Hex socket

head bolt (4pcs.)