Makita HM1810 Manual page 9

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[3] DISASSEMBLY/ASSEMBLY
[3] -3. Disassembling/Assembling Crank Section of AVT (cont.)
ASSEMBLING
1) Put Flat washer 65 into Crank box.
2) Then, as illustrated in Fig. 26, press-fit Needle bearing 7025 into Crank box using Crank complete and the other
Flat washer 65 as jigs,
Important:
Needle bearing 7025 is not reversible when assembled into Crank box. Be sure to assemble as illustrated in Fig. 26.
3) Put Ring 10 through the crank pin on Crank complete. Then apply Makita grease R.No.00 to the roller portion of
Needle bearing 7025, then assemble Crank complete into the Needle baring. (Fig. 27)
4) Put the other Flat washer 65 into Crank box. With retaining ring R-80, fix the parts assembled into Crank box.
Then make sure that Crank complete rotates easily by finger.
Fig. 26
Needle bearing
7025
Crank box
5) Move Crank shaft to the rear dead point (or to the front dead point). Then, aligning the elliptic hole of Crank complete
with the crank pin on Crank shaft, fit Crank box to Crank housing. (Fig. 28)
If the crank pin is not completely inserted into the elliptic hole or positioned on the wrong hole, a gap of approx. 5mm
will occur between the brim of Crank box and Crank housing. In this case, turn Crank shaft slowly until the crank pin
is completely inserted in the elliptic hole to eliminate the gap.
6) Secure Crank box to Crank housing with four M6x20 hex socket head bolts. (Fig. 29)
7) Do the reverse of the disassembling steps from 1) to 4).
Fig. 28
Connecting rod
Crank housing
Crank complete
arbor press
Crank complete
Flat washer 65
(another one)
Assemble Needle bearing 7025
so that the brim of the needle baring
is placed on the arbor press side.
Flat washer 65
(mounted in the previous step)
Crank shaft
at the rear dead point
crank pin
on Crank shaft
elliptic hole
Crank box
Fig. 27
crank pin
Ring 10
Apply Makita grease R.No.00
to the roller portion.
Fig. 29
Crank box
Hex socket
head bolt M6x20
P 9 / 20