I. Basic Parameters

Original Part Number: 28300-E0110 (DENSO Original Equipment); DC 24V; High-Current Starter Main Relay (Starter Solenoid Safety Relay)

Contact Capacity: High-power rating; controls the starter solenoid switch; features a 4-pin "large-foot" base (physically interchangeable with the 28300-E0080 base; directly swappable on select models)

Original Replacements: 28300-E0080, 28300-E0060, 182800-4190 (direct, pin-compatible replacements)

II. Compatible Models (Hino J05E / J08E Engines)

Kobelco Excavators

SK200-8, SK210-8, SK250-8, SK260-8, SK330-8, SK350-8 (The primary starter relay for the entire Hino -8 series lineup)

Hino Construction Machinery

J05E / J08E Engine-equipped Concrete Mixer Trucks, Concrete Pump Trucks, Hino Commercial Trucks, and Generator Sets

III. 4-Pin Wiring Definition (Pinout matches the E0080 model)

Pins 1 & 2: Coil Control Lines (24V; Ignition Switch Signal [Positive] + Ground [Negative])

Pin 3: Battery 24V Positive Input

Pin 4: Output to Starter Solenoid Switch

Troubleshooting: If short-circuiting Pins 3 and 4 causes the starter to spin immediately, the relay is defective.

IV. Distinguishing Between E0080 / E0110

28300-E0080: Older model; commonly used in early -8 series machinery.

28300-E0110: Newer, optimized model for late -8 series machinery; features thickened contacts for enhanced high-current durability; serves as the official factory-authorized upgrade replacement for the E0080.

V. Common Failure Symptoms

Turning the ignition key produces no audible "click" (solenoid engagement sound), and the starter motor fails to operate.

Contact Welding/Sticking: The starter motor continues to run even after the engine has been shut off. Intermittent failure to start (cold or hot) — Internal contact oxidation