Hitachi ZW180 Operator's Manual page 231

ZW220, ZW250
1. Clean the areas around the oil filter.
2. Before remove cartridge type element (1), loosen drain
plug (2) to drain oil from the cartridge. The oil is drained
through the drain hose. After draining the oil, tighten the
drain plug.
3. Remove cartridge type element (1) by turning it counter-
clockwise with a filter wrench.
IMPORTANT:
• Take care not to allow foreign matter such as dirt
to enter the oil filter.
• Be careful not to damage the filter body when re-
moving or installing the filter.
• Never reuse a cartridge type element.
4. After coating a new cartridge gasket with engine oil, turn
the cartridge clockwise until the gasket comes in contact
with the sealing surface.
5. Using the filter wrench, tighten the cartridge 3/4 to 1
turn more. Take care that if the cartridge is excessively
tightened, the cartridge may be deformed.
NOTE: Install the cartridge with care so that the gasket is not
damaged due to twist. Check for any oil leakage at the
filter mounting area.
MAINTENANCE
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M4GB-07-023
M4GB-07-021