MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH 4.12.6 WATER FILTER - REPLACE FILTER CARTRIDGE Legend for illust. Z 21688 (1) Access cover for water filter compartment (2) Water filter (3) Water pump (4) Pressure compensation tank (5) Water tank (6) Water tap Replace filter cartridge of water filter (2) as follows: 1. Open water tap (6) and drain all water from tank (5). 2. Remove access cover (1). 3. Depress red pressure relief button (if so equipped) to relieve pressure. 4. Unscrew bottom of housing. Remove large O-ring, wipe clean of lubricant and set aside. 5. Remove used cartridge and discard. Rinse out bottom of housing and fill about 1/3 full with water.
Add about 2 table- spoons of bleach and scrub cap and bottom of housing with nonabrasive sponge or cloth. Rinse thoroughly. 6. Lubricate O-ring with clean petroleum jelly (Vaseline). Place O-ring back into groove and smooth into place with finger. 7. Insert new cartridge over stand pipe in bottom of housing. Cartridges with tapered ends need to be specifically installed with the tapered end toward the threads of the housing. 8. Screw bottom of housing onto cap and hand tighten. DO NOT over-tighten. Make sure cap standpipe slips into cartridge. 9. Fill water tank (5) with 50 liters of clear water. 10. Depress pressure relief button (if so equipped) to release trapped air. 11.
Open water tap (6) and flush the new filter cartridge for a min- imum of 5 minutes. The water must be completely clear before closing the tap. DO NOT drink the water of the cab water system. The cab water system is not constructed as a drinking water system. 437 WARNING