Alternator for Case & John Deere Crawler Dozers and Excavators - 24V 45A
Alternator for Case & John Deere Crawler Dozers and Excavators - 24V 45A
SKU:400-24077
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Alternator for Case & John Deere Crawler Dozers and Excavators - 24V 45A
24-volt 45 amp IR/EF alternator - replaces Bosch 0-120-489-071, Lester 12148
This 24-volt, 45-amp alternator is built to OEM specifications for Case and John Deere crawler dozers, excavators, wheel loaders and tractors, and for Bell graders running John Deere diesel engines. It carries an internally regulated, externally fanned (IR/EF) design and an 8-groove pulley to match the original fitment.
Every unit is built as a fit-and-function replacement for the factory alternator, so it bolts straight in without rewiring. It supersedes Bosch 0-120-489-071, 0-120-488-294 and 0-120-488-206, and interchanges with Lester 12148 and Iskra IA 0759. Check the pulley diameter and groove count below against your existing unit before ordering. The regulator is built into the unit rather than mounted separately, keeping the wiring loom identical to the factory setup.
Key Features
- 24-Volt, 45-Amp output rating
- Internally regulated, externally fanned (IR/EF)
- 8-groove pulley, 59mm outside diameter
- Covers Case crawler dozers, excavators and wheel loaders
- Covers John Deere crawlers and Bell graders with John Deere diesel engines
- Direct OEM fit and finish
- 12-month warranty as standard
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 24V |
| Amperage | 45A |
| Rotation | Clockwise (CW) |
| Regulator | Internally Regulated (IR) |
| Fan Type | Externally Fanned (EF) |
| Pulley | 8-groove, 59mm OD |
| Lester Number | 12148 / 12148N |
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 |
|---|---|
| Bell Grader 670CH, 770CH (John Deere diesel) | 1997-2006 |
| Case Crawler Tractor 1155E (6-590, 6-830 diesel) | 1985-1993 |
| Case Wheel Loader W14B (6-590 diesel) | 1985-1989 |
| Case Excavator 1085B, 1086B, 9010, 9010B, 9020, 9020B, 9030, 9030B | Not specified by supplier |
| Case Tractor 850D, 850E, 850G, 855D, 855E, 1150E, 1150G, 1550 | Not specified by supplier |
| John Deere Crawler 605C, 655B, 750B, 750C, 750C-II | Not specified by supplier |
| John Deere Excavator 270LC, 330LC, 330LCR, 370 | Not specified by supplier |
| John Deere Combine 2054 | Not specified by supplier |
| John Deere 544H Loader | 1997 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| 0-120-489-071, 0-120-488-294, 0-120-488-206 | Bosch |
| IA 0759 | Iskra / Letrika |
| AL9940X, BAL9940X | Prestolite / Leece-Neville |
| 12148, 12148N | Lester |
| 3020678, 19020536, 3939028, 220-378A | Case / J&N Electrical |
| 400-24077, ABO0204 | Arrowhead / J&N |
Frequently Asked Questions
Will this fit without modification?
Yes. This alternator matches the OEM mounting, pulley groove count (8) and diameter (59mm) of the original unit, so it bolts in directly with no rewiring.
How do I confirm this is the right alternator?
Check the number on your existing unit against the cross reference table. Bosch 0-120-489-071, 0-120-488-294 and 0-120-488-206, and Lester 12148, all point to this alternator.
What's included?
One complete 24-volt, 45-amp alternator with pulley fitted, ready to install.
How do I know my old alternator has failed?
Watch for a charge warning light that stays on, a battery that won't hold charge, dimming lights at idle, or an unusual whining noise from the unit.
Does this include the regulator?
Yes, the unit is supplied complete with its internal regulator (IR) already fitted, so there is no separate regulator to source or wire in.
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