Komatsu PC210-10 Operation & Maintenance Manual page 383

MAINTENANCE
6. Fit ring (3) to the threaded part of the body and tighten it
with the hand firmly until it stops.
7. Using the special wrench, further tighten the ring 1/15 to 2/
15 turns (1 to 2 ridges of the ring). If the engine is operated
with the ring tightened insufficiently, oil and blow-by gas
may leak.
8. Check the KCCV hose for leakage, crack, and loose clamp,
and replace it if necessary.
MAINTENANCE SCHEDULE TABLE
4–73