Makita EB7650TH Technical Information page 25

(
11) The parts that can be replaced are shown in Fig. 56
Fig. 56
(A)
(B)
(G)
(H)
(L)
(A) Piston
(C) Top ring
(E) Oil ring
(G) Piston pin
(I) Woodruff key 4
(K) Oil seal (L)
(M) Crankshaft complete
Assembly
(1) Assemble the parts by reversing the disassembly procedure.
(2) Top ring (b) and Second ring (c) of Piston (a) are different. Top ring (b) has a barrel face profile and has no top and bottom as both sides
are the same. Second ring (c) has a taper face profile with larger bottom than top and so orientation matters. Attach a new second ring so
that the white paint (d) mark comes to the side that is on the right when viewed from the side surface of Piston (a). (Fig. 57)
When inserting Piston into Cylinder:
・The gaps of Top ring (b) and Second ring (c) must be at 180 degrees to each other.
・The gaps of the three parts of Oil ring must be at 120 degrees to one another.
Fig. 57
Up
.
(C)
(D)
(E)
(F)
(J)
(K)
(I)
(M)
(B) Ring spring 12
(D) Second ring
(F) Ring spring 12
(H) Needle roller bearing
(J) Flat washer 41
(L) Oil seal 17
(a)
(b)
with a barrel face profile
(c)
with a taper face profile
(d)
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