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Hitachi ZAX220-5/6 Excavator Isuzu 6BG1 ENGINE Starter Motor MDN620
FUNCTION
1. Engine Starting Function: Upon turning the ignition key or pressing the start switch, the MDN620 starter motor rapidly drives the engine flywheel to rotate, bringing the diesel engine up to starting speed to facilitate compression ignition and ensure a smooth start.
2. High Torque Output: With a power output of approximately 4.5 kW, it delivers ample starting torque to meet the cold-start requirements of excavators operating in low-temperature environments, after prolonged periods of inactivity, or under harsh working conditions.
3. Drive Gear Engagement: Equipped with a built-in 11-tooth drive pinion, it reliably engages with the engine flywheel ring gear, converting electrical energy into mechanical torque to drive the flywheel's rotation. Once the starting process is complete, the pinion automatically disengages to prevent damage caused by high-speed over-rotation.
4. Solenoid Switch Control: The integrated solenoid switch controls the opening and closing of the main circuit, as well as the extension and retraction of the drive gear, thereby enabling remote starting control for safe and convenient operation.
Working Principle
1. Starter Switch Engaged: The 24V power supply is energized via the electromagnetic switch.
2. Electromagnetic Switch Actuation: The switch activates, driving the shift fork forward to engage the 11-tooth pinion with the flywheel ring gear; simultaneously, the main circuit closes, allowing a high-amperage current to flow into the motor.
3. Motor Rotation: The armature rotates at high speed; its rotational velocity is reduced-and torque amplified-by an internal planetary gear reduction mechanism. This drives the pinion to turn the flywheel, bringing the engine up to starting speed and initiating ignition.
4. Completion of Starting: The switch is de-energized, and a return spring automatically disengages the pinion. An internal one-way clutch prevents the engine from back-driving the motor, thereby preventing damage.
Advantages
| No. | Performance Advantage | Specific Description |
|---|---|---|
| 1 | High Starting Torque & Power | 4.5kW heavy-duty design provides strong torque, suitable for reliable cold starts of the Isuzu 6BG1 diesel engine under harsh conditions such as low temperature or long downtime |
| 2 | Gear Reduction Structure | Adopts planetary gear reduction system, delivering higher torque in a compact size, more power-efficient and effective |
| 3 | Excellent Durability | Heavy-duty construction specially designed for construction machinery – resistant to high temperature, vibration, and dust; ideal for frequent starting in excavators |
| 4 | Fast and Reliable Starting | Precise electromagnetic switch control and smooth pinion engagement ensure high success rate and reduce starting failures |
| 5 | Comprehensive Safety Protection | Built-in overrunning clutch (one-way clutch) prevents the engine from driving the starter after startup, protecting the motor from damage |
| 6 | High Cost-Effectiveness | High-quality aftermarket product with performance close to OEM at a more affordable price, lowering maintenance costs |
| 7 | Excellent Installation Compatibility | Direct replacement for original starters (e.g., 0-28000-6200 / 1-81100-0360), perfect match in mounting holes and 11-tooth pinion – no modifications needed |
Interfacing Relationships
Installed on the side of the engine flywheel housing, near the engine flywheel ring gear.
DETAILS
| DESCRIPTION | Starter Motor | PART NUMBER | MDN620 |
| WEIGHT |
10KG |
VOLUME |
356 × 203 × 203 mm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Daily Maintenance Suggestions
| Maintenance Item | Maintenance Interval | Specific Content and Recommendations |
|---|---|---|
| Battery Voltage & Connection Check | Daily (before operation) | Check battery voltage (≥24V), clean battery terminals, ensure main power cable and ground wires are tight and free of corrosion |
| Visual & Leak Inspection | Daily (before operation) | Inspect the starter for oil leaks, loose mounting bolts, damaged wiring, or signs of overheating |
| Starting Performance Check | Daily / per shift | Listen for normal cranking sound; watch for clicking, grinding, slow cranking, or failure to engage |
| Avoid Prolonged Cranking | During daily use | Do not crank continuously for more than 10-15 seconds; wait 30-60 seconds between attempts to prevent overheating |
| Fastener & Wiring Check | Every 250-500 working hours | Check mounting bolt torque and wiring insulation; tighten any loose parts as needed |
| External Cleaning | Every 500 working hours | Remove dust and oil from the starter exterior to keep it clean |
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