Hayter Ranger 53 Pro 396D Owner's Handbook Manual page 32

MAINTENANCE
1.30 1.30
MAINTENANCE SCHEDULE Continued.
EVERY 50 HOURS OR EVERY SEASON
Change engine oil.
EVERY 100 HOURS OR EVERY SEASON
Clean engine cooling system. Clean more often under dusty conditions or when air
borne debris is present or after prolonged operation whilst cutting tall, dry grass.
Service the dual element air cleaner cartridge.
Replace spark plug.