I. Basic Parameters

Voltage: DC 24V (Coil: 24V; applicable to all excavator models with 24V power supply)

Original Manufacturer: DENSO (Original Equipment for Hino); OEM Part No.: 28300-E0080; Aftermarket Universal Alternatives: 28300-E0060, 182800-4190 (Direct-fit replacements with identical base and pin configuration)

Function: Starter Motor Solenoid / Main Starter Safety Relay; controls the switching of high-current flow to the starter motor, preventing the ignition switch from overheating or burning out due to overload.

II. Compatible Models (Kobelco + Hino Engines)

Kobelco Excavators

SK200-8, SK210-8, SK250-8, SK260-8, SK330-8, SK350-8 (Key models featuring J05E/J08E Hino engines)

Full Range of Hino Construction Machinery / Trucks

Universal compatibility for vehicles equipped with J05E and J08E engines, including buses, concrete mixers, concrete pump trucks, and Hino 700 series tractor units.

III. Wiring Definition (4-Pin Terminal)

Coil Control: Pin 1 (+) & Pin 2 (-) = 24V Control Line (Ignition start signal)

Main Power: Pin 3 (Battery Positive), Pin 4 (Starter Solenoid Switch)

Symptom of Failure: Turning the ignition key produces no audible "clicking" sound (solenoid engagement), and the starter motor fails to turn; however, if the motor spins when Pins 3 and 4 are manually bridged (short-circuited), the relay is confirmed to be defective.

IV. Part Selection

Original DENSO: 28300-E0080 (Genuine OEM part; highly durable and vibration-resistant)

Universal Alternatives: 28300-E0060, 182800-4190 (Pin layout and mounting positions are identical; commonly used replacement parts for excavator maintenance)

Aliases: Starter Solenoid Relay, Motor Safety Relay, Starter Main Relay

V. Common Faults

Internal Coil Open Circuit: Turning the ignition key results in no response or action from the relay. Contact Burnout and Sticking: Motor continues to spin freely after the engine is shut off.

Water Intrusion and Corrosion: Intermittent failure to start in cold temperatures.

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