Hitachi ZW 550-6 Operator's Manual page 313

5. Remove element (3) by turning it counterclockwise
with the tool (oil filter wrench).
6. Apply a thin coat of clean engine oil to the gasket of
a new element.
IMPORTANT:
 Do not reuse element (1).
 When replacing oil filter elements, make sure to
replace both of them at the same time.
7. Install a new element.
Screw in the element until the gasket comes in
contact with the seal surface. Then tighten it by one
more turn using the tool (oil filter wrench).
8. Replace the other filter element in the same manner.
9. Confirm that the oil pan drain cock or plug is securely
tightened.
10. Remove the oil level gauge and carefully supply the
specified amount of engine oil from the oil filler.
11. Install the oil level gauge and the filler cap.
12. Start the engine 5 minutes after refueling.
13. While running the engine at low idle, check the oil
filter, drain cock, and sealing surfaces for any oil
leakage.
14. Stop the engine. About 20 minutes later, recheck the
oil level. If necessary, add oil.
MAINTENANCE
7-29
Filter Body
Gasket
Element
MNHE-07-068
3