Alternator for John Deere 850 900HC 950 1050 1250 1450 1650 Tractors - 12V 25A
Alternator for John Deere 850 900HC 950 1050 1250 1450 1650 Tractors - 12V 25A
SKU:400-52215
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Alternator for John Deere Compact Utility Tractors
Fits 850, 900HC, 950, 1050, 1250, 1450 & 1650 · 12V 25 Amp · Replaces TY6647 / CH10493
This alternator is a direct OEM-fit replacement for the John Deere compact utility tractor range built around the Yanmar 3T80 and 3T90 diesel engines, covering the 850, 900HC, 950, 1050, 1250, 1450 and 1650 from the late 1970s through to 1989. It is a 12V, 25 amp unit with clockwise rotation and a single V-belt pulley sized for a 1/2 inch belt width, matching the original factory fitment.
The unit uses an externally regulated (ER) design with an external fan (EF), matching the specification of the original component so no wiring or bracket changes are needed. Because it is built to the original mounting and pulley dimensions, installation is a straightforward like-for-like swap using standard hand tools.
Key Features
- 12V, 25 Amp output
- Clockwise rotation, 10 o'clock clock position
- Single V-belt pulley (V1 class), 1/2 inch belt width
- Externally regulated with external fan
- Covers seven John Deere compact tractor models
- Replaces John Deere TY6647, CH10493 and SE501365
Technical Specs
| Specification | Detail |
|---|---|
| Voltage | 12V |
| Amperage | 25A |
| Rotation | Clockwise (CW) |
| Clock Position | 10 |
| Pulley | 1-groove V-belt (V1 class), 1/2 inch width |
| Regulator | Externally regulated (ER) |
| Fan Type | External (EF) |
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 |
|---|---|
| John Deere 850 (Yanmar 3T80 Diesel) | 1978-1988 |
| John Deere 900HC (JD 3-79 Diesel) | 1986-1989 |
| John Deere 950 (Yanmar 3T90-J Diesel) | 1978-1988 |
| John Deere 1050 (Yanmar 3T90 Diesel) | 1978-1989 |
| John Deere 1250 (Yanmar 3T90 Diesel) | 1982-1989 |
| John Deere 1450 (Yanmar 3T90 Diesel) | 1982-1989 |
| John Deere 1650 (Yanmar 3T90 Diesel) | 1982-1989 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number | Manufacturer / Brand |
|---|---|
| CH10493, SE501365, TY6647 | John Deere |
| 021000-728, 021000-7280, 021000-7281, 5702100-728 | Denso |
| AND0330, ND021000-7281, ND5702100-728 | Arrowhead |
| 14519 | Lester |
| 14519N | WAI |
Frequently Asked Questions
Will this alternator fit my tractor without modification?
Yes, it is built to the original John Deere compact utility tractor specification and fits using the factory mounting points and pulley.
What is included?
One complete alternator unit, ready to fit.
How do I know my old alternator has failed?
Look out for a charging or battery warning light, dimming lights, or the battery losing charge while the engine is running.
Is the voltage regulator included?
No — this is an externally regulated (ER) unit, so it works with your tractor's existing external regulator.
My tractor is not listed — will it still fit?
Check the number stamped on your original alternator against the cross reference table above; if it matches, this is the correct replacement.
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