This 24-volt, 30-amp alternator is a complete replacement unit built to the output and mounting specification of the original equipment fitted to Mitsubishi 6D1, 6D2 and 6D31 industrial and excavator engines, including the Kobelco SK200 excavator with the Mitsubishi 6D31 engine. It is manufactured by Mitsubishi, the original supplier for this application.
It is supplied complete with a 2-groove V-belt pulley (82mm outside diameter) and rotates clockwise (CW), matching the factory setup exactly. Each unit is tested for correct output and rotation before it is dispatched. As a conventional alternator it requires no ECU coding or programming to fit - simply mount, connect and belt it up in place of the original unit.
Key Features
- 24-volt, 30-amp output to factory specification
- Internal regulator, external fan (IR/EF) configuration
- Clockwise (CW) rotation
- 2-groove V-belt pulley, 82mm OD
- Direct replacement for Mitsubishi 6D-series industrial engines
- Fits Kobelco SK200 excavators with the 6D31 engine
Technical Specs
| Specification |
Detail |
| Voltage |
24V |
| Amperage |
30A |
| Rotation |
Clockwise (CW) |
| Regulator |
Internal (IR) |
| Fan Type |
External (EF) |
| Pulley Type |
2-groove V-belt (2-V), 82mm OD |
| Manufacturer |
Mitsubishi |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Mitsubishi 6D1, 6D2 engines |
1985-onwards |
| Mitsubishi 6D31 engines |
1986-onwards |
| Kobelco SK200 excavator (Mitsubishi 6D31 engine) |
Not specified - confirm against OEM part number |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| AMT0239 |
Arrowhead |
Frequently Asked Questions
Will this alternator fit without modification?
Yes, it is a direct bolt-in replacement, matching the mounting and pulley configuration of the original unit.
Will it fit my Kobelco SK200?
Yes, provided your machine uses the Mitsubishi 6D31 engine with the 24-volt, 30-amp charging system. Check the voltage and pulley configuration on your existing unit before ordering.
What's included?
You receive one complete alternator unit, ready to fit - no additional brackets or pulleys are required.
How do I know my old alternator has failed?
Common signs include a charge warning light staying on, a flat or slowly draining battery, or no output reading at the battery terminals with the engine running.
Do I need to reprogram anything after fitting?
No, this is a conventional alternator with no ECU coding or programming required - it is a straightforward mechanical and electrical swap.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
