Makita EA3500S Technical Information page 7

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[2] DISASSEMBLY/ ASSEMBLY
[2]-6. Oil pump section
Refer to Figs. 15 and 16 for the mechanism of Oil pump section.
Oil pump to supply Chain oil runs by Pump drive on Crank shaft.
The gear teeth of Pump drive are engaged with those of Oil pump,
and therefore, Chain oil is supplied to Chain when Engine runs.
The fluid amount of Chain oil can be adjusted by turning Adjusting
screw as follows:
clockwise = increase
counterclockwise = decrease
DISASSEMBLING
(1) Remove Clutch drum section and Clutch section. Refer to
[2]-2 "Clutch drum section" and [2]-5 "Clutch section".
(2) Remove Tension spring 10. Refer to [2]-3 "Chain brake section".
(3) Remove Pump drive from Crank shaft while sliding Pump drive
back and forth slowly to disengage with Gear teeth of Oil pump
adjustment set.
(4) Remove Oil suction line complete from Oil pump complete.
(5) Remove Oil pump complete from Engine housing complete
by unscrewing 4.7x16 Hexalobular tapping screw.
(6) Oil suction line complete is in Engine housing complete
with Oil pump complete and Chain oil tank connected. And
therefore, pull Oil suction line complete carefully out of
Engine housing complete, then remove Oil suction line
complete from Oil pump complete as drawn in Fig. 15.
Note: Even if some of Oil pump complete are out of order,
replace all the Oil pump complete with new one.
ASSEMBLING
While pushing Adjusting screw against its compression spring
reaction force, turn the screw counterclockwise until the pin ends
are fit into two slits of Oil pump body. If this way is difficult,
push Piston slightly in the direction of Body.
Note: When set Oil pump complete in place, turn Adjusting
screw counterclockwise to the full.
Fig. 15
Pump drive
4.7x16
Adjusting screw
Hexalobular
for oil fluid
tapping screw
Fig. 16
Pump drive
Oil suction line complete
Oil pump complete
Body
Oil pump adjustment set
Piston
Pin ends
Pass Pin ends through
Slits to remove
Adjusting screw with
Adjusting screw.
compression spring
4.7x16 Hexalobular tapping screw
P 7/ 16
Oil pressure line
complete
Gear teeth of
Oil pump
adjustment set
Oil pressure
line complete
Slits