P 7/17
Repair
[3]DISASSEMBLY/ASSEMBLY
[3]-4. Motor Section
DISASSEMBLY
1)Disassemble Handle section as illustrated in Fig. 2
2)Separate the contact of Carbon brushes from Commutator as described in Fig. 11.
3)Disassemble Crank housing complete from Motor housing as illustrated in Fig. 12.
4)Remove Piston from Crank shaft as illustrated in Fig. 13.
Fig. 11
1. Remove Rear cover from Motor housing.
Motor housing 
A
Rear cover 
4x18 Tapping screw (2 pcs)
2.Remove the end of Spiral spring from Carbon brush because Carbon brush is pressed with Spiral spring to maintain secure contact with Commutator.
3.By pulling Carbon brush, separate the contact of Carbon brushes from Commutator.
[Spiral spring and Carbon brush
viewed from A]
Carbon brush Spiral spring
Fig. 12
1.Disconnect Crank housing cover from Crank housing complete by unscrewing M4x25 Hex socket head bolt; no need to remove the cover in this step.
M4x25 Hex socket head bolt (1 pc)
Crank housing cover
2.Lifting up Crank housing cover, remove Barrel section from Crank housing by unscrewing four M5x25 Hex socket head bolts.
M5x25 Hex socket head bolt (4 pcs)
3.Disassemble Crank housing complete from Motor housing by unscrewing four 5x25 Tapping screws.
Crank housing complete
5x25 Tapping 
Screw (4 pcs) 
Motor housing
Fig. 13
1.Remove Crank cap by unscrewing four M4x18 Pan head screws.
M4x18 Pan head screw (4 pcs)
Crank cap
2.For easy removal of Piston, move it to the front dead center.
Piston
3.Remove Piston, then unscrew two M4x16 Hex socket head bolts that fasten Crank section to Crank housing complete.
M4x16 Hex socket |
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head bolt (2 pcs) |
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Crank housing
completeCrank chamber, viewed from Crank cap side