Hitachi ZW 370-6 Operator's Manual page 322

5. Remove the element by using 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 the element.
 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.
Check Oil Separator Hose
--- every 10 hours
Check oil separator hoses.
Replace any that are cracked, swollen, or brittle.
Change Oil Separator Element
--- every 500 hours
1. Clean the areas around the oil separator so that an alien
substance is not in the filter case and remove filter cap
(1).
2. Replace element (2) with new one.
3. Install filter cap (1).
MAINTENANCE
7-28
Filter Body
Gasket
Element
95Z7-7-28-3
1
2
95Z7B-7-28-2a