Makita HR4013C Technical Information page 9

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3]-3. Crank housing, Cylinder, Counter weight (cont.)
(6) Put 1R400 on Flat washer 33 located on Chuck side of Cylinder. Assemble two pieces of 1R022 to 1R306.
Set 1R306 to Arbor press.
Then compress Compression spring 34 by pressing down 1R400 using Arbor press with 1R022 and 1R306 until
Retaining ring (EXT) WR-32.5 is revealed, and remove it with 1R003 with 1R212. (Fig. 15)
(7) Return Compression spring 34 back to the original shape gradually by reducing the pressure.
Cylinder section is disassembled as drawn in Fig. 16.
Fig. 15
Arbor press
1R306
1R022
Retaining ring (EXT)
WR-32.5
Fig. 16
Retaining ring (EXT)
WR-32.5
Chuck side
1R400
Ring 33 Flat washer 33
Compression spring 34
Note: Set two 1R022 to 1R306 while keeping the same
spaces between two 1R022 and Cylinder.
Otherwise, it will be extremely difficult to expand
Retaining ring (EXT) WR-32.5 due to the tight space.
Retaining ring (EXT)
WR-32.5
Flat washer 33
Cylinder 28.5 Retaining ring EXT WR-32.5
P 9/ 19
1R003 with 1R212
O ring 30 (3 pcs.)
Crank housing
side