Komatsu GD555-5 Operation & Maintenance Manual page 319

SERVICE PROCEDURE SERVICE PROCEDURE
7. After draining the oil, remove bolts (3) (6 pieces) to take cover
(4) off.
At this time, cover (4) possibly jumps out by the force of gas
spring (5). While pushing down cover (4), remove bolts (3).
8. Pull up the top of rod (6), and remove spring (5) and strainer
(7).
9. Remove any dirt stuck to strainer (7), then wash in clean diesel
oil or flushing oil. If strainer (7) is broken, replace it with a new
part.
10. Refit strainer (7) by inserting it into tank projecting part (8).
11. Assemble so that the protruding portion at the bottom of cover
(4) holds spring (5) down, and then tighten with bolts (3).
12. Install drain plug (P).
Tightening torque: 118 to 162 Nm {12 to 16.5kgf·m, 86.8 to 119.3 lbft}
13. Pour in the specified amount of engine oil from oil filler (F).
14. After filling with oil, check that the oil is at the specified level. For details, see "CHECK OIL LEVEL IN
HYDRAULIC TANK, ADD OIL (PAGE 4-53)".
15. Install oil filler (F).
REMARK
Use the supplied hose to prevent oil from spraying out into the surrounding area.
16. If the oil level is correct, tighten the cap of oil filler (F), then remove the hose.
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MAINTENANCE MAINTENANCE