Yanmar 4LHA-DTP - Lube Oil Pump

Chapter 5 Lubrication System
2. Lube Oil Pump
2. Lube Oil Pump
2-1 Lube oil pump construction
The trochoid type lube oil pump is mounted on the gear case
side cylinder block and the rotor shaft gear is driven by the
crankshaft gear through the idle gear.
The lube oil flows from the intake filter mounted on the bottom
of the cylinder block through the holes in the cylinder block
and gear housing, and out from the holes in the gear housing
and cylinder block to the discharge filter. The lube oil pump is
fitted with a pressure safety valve which maintains the dis-
charge pressure at 0.39(4)MPa (kgf/cm)
4LHA Sen
Intake
Outer rotor
Mnner rotor
Cylinder block
Oil pressure safety valve
5-3