Yanmar 4LHA-HTP Operation Manual page 584

Chapter 7 Reduction and Reversing Gear
4. Disassembly
4LHA Series 1
4. Inspect O-rings for wear and replace if necessary.
OH. FILTER and DIPSTICK
2. Remove oil filter from housing by turning T-handle coun-
terclockwise and pulling up on cover.
a - O-rings
5. Push hose of suction pump through suction pipe and down
to the bottom of the housing. Pump fluid from housing.
3. Remove filter element from cover.
7-2-10