Alternator for Komatsu Equipment 24-Volt 15 Amp
Komatsu D31 Crawler, EG85B Generator & S23E Lift Truck - 24V, 15 Amp, IR/EF
This alternator is a direct replacement for Komatsu equipment fitted with a single-groove V-belt alternator of this specification, including the D31 crawler dozer, the EG85B and EG85BS generator sets and the S23E lift truck. It is built to OEM specifications by NIKKO, giving the same fit, output and mounting as the original alternator it replaces, with no modification required for installation.
Rated at 24 volts with a 15 amp output, this internal-regulator, external-fan (IR/EF) unit rotates clockwise (CW) and uses a V1 pulley measuring 95mm OD, matching the original factory specification.
Key Features
- 24V, 15 Amp output
- Internal regulator, external fan (IR/EF) design
- V1 pulley, 95mm OD
- Clockwise (CW) rotation
- Manufactured by NIKKO
Technical Specs
| Specification |
Detail |
| Voltage |
24V |
| Amperage |
15A |
| Rotation |
Clockwise (CW) |
| Pulley Type |
V1 - 95mm OD |
| Fan Type |
External (EF) |
| Regulator |
Internal (IR) |
| Manufacturer |
NIKKO |
| Interchange Reference |
Lester 12253 / 12256 / PIC 285-125 |
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 |
| Komatsu D31 Crawler (4D105 engine) |
1995 |
| Komatsu EG85B Generator Set (6D95 engine) |
1994 |
| Komatsu EG85BS Generator Set (6D95 engine) |
1994 |
| Komatsu S23E Lift Truck (6D95 engine) |
1994 |
Note: a 20 amp version of this alternator is also available under SKU 400-50012 if your application requires the higher output.
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 600821-3840, 600821-3850, 600821-3860, F674091 |
Komatsu |
| RKD15A01 |
Komatsu Reman |
| 0-33000-5480, 0-33000-5510, 0-33000-5700 |
Nikko |
| 113212 |
Cargo |
| 12253, 12256 |
Lester |
Frequently Asked Questions
Will this alternator fit without any modification?
Yes. This is a direct OEM fit and function replacement using the same mounting, pulley and electrical connections as your original unit, so no modification is needed.
What is included?
You receive one new alternator, ready to install using your existing bracket, belt and wiring loom.
How can I tell my old alternator has failed?
Common signs include a battery warning light, dim or flickering lights, a battery that won't hold charge, or a whining or growling noise from the alternator itself.
Is there a higher output version available?
Yes, a 20 amp version of this alternator is listed under SKU 400-50012 if your application needs the higher output.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
