PLATE 4788475 - Caterpillar

Illustration 1 g00744250
(1) Plastic cover
(2) Service indicatorThe Closed Crankcase Ventilation system (CCV) is equipped with a service indicator. If the fumes disposal filter becomes plugged prior to the normal service interval, increased restriction of the filter will cause the crankcase pressure to become positive. When the pressure continues to rise, the service indicator will show through the plastic cover. The service indicator indicates the need for the fumes disposal filter to be changed. Refer to the Operation and Maintenance Manual, "Closed Crankcase Ventilation (CCV) Fumes Disposal Filter - Replace" topic for more information.Note: Check the service indicator when the engine is running at low idle.