MAINTENANCE 4.9 EVERY 50 OPERATING HOURS OR WEEKLY TRAVEL GEARS AND MOTOR ADAPTER HOUSINGS - CHECK BREATHER FILTERS Legend for illustration Z 21771 (11) Connector on travel gear box for breather filter (18) (16) Connectors on motor adapter housing for breather filter (19) (18) Breather filters for travel gears (19) Breather filters for motor adapter housings (20) Pilot oil pressure hydraulic lines for releasing the parking brakes Check the four breather filters(18 and 19), located inside the cen- ter frame, for restriction. If necessary, remove breather filters, blow out with compressed air from inside to outside and reinstall. 337