I. Model and Identification

Model Number: 228-9108 (also written as 2289108 or CA2289108)

Common Name: Cat Engine Shutdown Delay Relay, Shutdown Timer Module, Shutdown Timer

Brand: Caterpillar (Cat) Genuine Part

Voltage: DC 24V

Core Function: Delays power cutoff by 10 seconds after the ignition switch is turned OFF, controlling the throttle actuator to execute the engine shutdown sequence.

II. Key Parameters

Delay: Fixed 10-second power-off delay (specifically for engine shutdown sequencing)

Contact Capacity: Medium current (to drive the throttle actuator)

Terminals / Connector: 4-pin plastic housing plug (includes wiring harness; black square housing)

Mounting: Fixed installation within the cab or electrical control box

Functional Logic: Key OFF → Relay maintains 24V output for 10 seconds → Throttle actuator pulls to shutdown position → Vehicle power supply is cut off after 10 seconds

III. Applicable Models (Cat Paving Equipment + Select Excavators)

Compactors / Rollers: CB-434D, CB-534D, CB-564D, CB-634D, CD-54

Pavers / Graders: CP-433E, CP-533E, CS-423E, CS-533E, PS-150C, PS-360C

Related Applications: Engine shutdown control circuits for Cat 320D/330D and similar excavators (same function, different model number)