SYSTEM / Electrical System Air Filter Restriction Indicator Purpose: It lights the air filter restriction indicator on the monitor unit in order to inform the clogged air filter to the operator. Operation: 1. When the air filter is clogged, the air cleaner restriction switch is grounded. 2. When the air cleaner restriction switch is grounded, the monitor unit lights the air filter restriction indicator.
3. When the clogged air filter is recovered, the air cleaner restriction switch is disconnected from the ground. 4. When the air cleaner restriction switch is disconnected form the ground, the monitor unit goes off the air filter restriction indicator. NOTE: The monitor unit lights the service indicator as well as the air filter restriction indicator at the same time.
Air Cleaner Restriction Switch
Monitor Unit Air Filter Restriction Indicator
Engine Engine Oil Pressure Switch
1A-9
Service Indicator
T4FG-02-03-022
T2-3-46
