Lube Oil Pump; Lube Oil Pump Construction; Specifications Of Lube Oil Pump; Lube Oil Pump Disassembly And Reassembly - Yanmar 3YM30 Service Manual

8. Lubrication system

8.2 Lube oil pump

8.2.1 Lube oil pump construction

The trochoid type lube oil pump is mounted in the gear
case cover, and the inner rotor is driven by the
crankshaft pulley.
The lube oil flows from the intake filter mounted on the
bottom of the cylinder body through the holes in the
cylinder body and engine plate, and out from the holes
in the engine plate and cylinder body to the discharge
filter.
The lube oil pump is fitted with a control valve, which
controls the discharge oil pressure at the specified
pressure.

8.2.2 Specifications of lube oil pump

Lube oil pump specifications
Engine speed
Pump speed
Delivery quantity
Delivery pressure
Oil temp.

8.2.3 Lube oil pump disassembly and reassembly

Disassembly
(1) Remove the crankshaft pulley.
(2) Remove the gear case cover.
(3) Remove the lube oil pump cover from the gear case cover. Do not disassemble the
inner /outer rotors, and check that the pump rotates smoothly.
(4) Remove the pressure control valve from the lube oil pump cover.
Note :
Only wash the control valve. Disassembly is unnecessary unless any abnormality in operation is
detected.
Reassembly
[NOTICE]
Always check if the pump rotates smoothly after installation on the gear case.
Running the engine when the pump rotation is heavy may cause the pump to be burnt.
(1) Apply lube oil to rotor (outer/inner) insertion part.
(2) Fasten the pump cover by the standard torque.
Tightening torque
(3) When replacing the lube oil pump, replace the whole assy.
-1
3600 (min
-1
3477 (min
19.0 (l/ min
0.43 MPa (4.4 kgf/cm
60±5 (°C)
5.9-7.9 N•m
(0.6-0.8 kgf•m)
153R1
Cover
Outer rotor
Control
Inner rotor
valve
Gear case cover
)
)
-1
)
2
) 0.049 MPa (0.5 kgf/cm
Crankshaft pulley
-1
800 (min )
-1
772 (min )
-1
8.0 (l/ min )
2
)