This alternator is a direct OEM-fit replacement for Case and New Holland construction machinery, covering the 580M and 590SM backhoe loader families, the 570MX and 586G, and the 650L, 750L and 850L crawler dozers. It is a high-output 12 volt, 90 amp unit with clockwise rotation.
The unit is internally regulated (IR) and uses an 8-groove serpentine pulley with the original P-IG-L plug connector, matching the factory electrical and mechanical fitment. It replaces the Case and New Holland numbers 87422777 and 84254289 and the equivalent Denso, Letrika (Iskra) and Mahle units listed below.
Key Features
- 12V, 90 Amp high output
- Clockwise rotation
- 8-groove pulley
- Internally regulated (IR)
- P-IG-L plug connector for a direct electrical match
- Covers backhoe loaders, crawler dozers and lift trucks
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
90A |
| Rotation |
Clockwise (CW) |
| Pulley |
8-groove |
| Regulator |
Internally regulated (IR) |
| Connector |
P-IG-L plug |
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 |
| Case Crawler Dozer 650L (all) |
All Years |
| Case Crawler Dozer 750L (all) |
All Years |
| Case Crawler Dozer 850L (all) |
All Years |
| Case Loader 570MX Series III |
All Years |
| Case Backhoe Loader 580M Series II & Series III |
All Years |
| Case Backhoe Loader 580SM Series II & Series III |
All Years |
| Case Backhoe Loader 580SM Plus Series II & Series III |
All Years |
| Case Backhoe Loader 590SM Series II |
All Years |
| Case Backhoe Loader 590SM Plus Series III |
All Years |
| Case Lift Truck 586G Series II & Series III |
All Years |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 84254289, 84416587, 87422777 |
Case |
| 84254289, 87422777 |
New Holland |
| 021080-1600, 102211-9090 |
Denso |
| AAK3828, AAK4804, AAK4813 |
Letrika (Iskra) |
| 11.204.060, 11.204.319, 11.204.352 |
Letrika OEM |
| MG274 |
Mahle |
| MG274, ND021080-1600, ND102211-9090 |
Arrowhead |
Frequently Asked Questions
Will this alternator fit my machine without modification?
Yes, it is built to the original Case/New Holland specification and fits using the factory mounting points, pulley and plug.
What is included?
One complete alternator unit, ready to fit.
How do I know my old alternator has failed?
Common signs include a charging warning light, low system voltage, or the battery not holding charge during operation.
Does this fit other Case or New Holland machines not listed?
It is built to the specification listed above; if your machine is not listed, compare the number stamped on your original alternator against the cross reference table before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
