Renewed Twin Disc Marine Gearbox 521

Renewed Twin Disc Marine Gearbox 521 ratio 4.0:1
OIL CAPACITY , MIN OIL PRESSURE WHEN CRUISING / 100 PSI
EVERY 10 HOURS OR DAILY: CHECK OIL LEVEL
EVERY 100 HOURS OR WHEN BOAT IS DOCKED:
WATER PUMP GREASE TO PREVENT BILGE WATER ENTERING
EVERY 1000 HOURS: DRAIN AND REFILL HOUSING WITH Clean oil
REMOVE AND REPLACE FILTER ELEMENT