Alternator for John Deere ZTS Excavators
Fits John Deere 27C ZTS, 27ZTS, 35, 35C ZTS, 35ZTS, 50C ZTS & 50ZTS · 12V 35A
This alternator is a direct OEM-fit replacement for the John Deere ZTS zero-tail-swing excavator range - the 27C ZTS, 27ZTS, 35, 35C ZTS, 35ZTS, 50C ZTS and 50ZTS - which are powered by the Isuzu 3LD1 and 3LD2 diesel engines. It is built to a 12 volt, 35 amp specification with clockwise rotation and a single V-belt pulley with a 74mm outside diameter to match the original factory fitment.
The unit is internally regulated (IR) with an internal fan (IF), matching the original specification so it fits in place of the factory unit with no modification needed. It replaces John Deere AT195649 and Isuzu 8972251170. Correct alternator output keeps the battery properly charged for reliable starting and consistent operation of the excavator's electrical and hydraulic control systems.
Key Features
- 12V, 35 Amp output
- Clockwise rotation
- Single V-belt pulley, 74mm OD
- Internally regulated with internal fan
- Direct OEM fit for John Deere ZTS excavators with Isuzu 3LD1/3LD2 engines
Technical Specs
| Specification |
Detail |
| Voltage |
12V |
| Amperage |
35A |
| Rotation |
Clockwise (CW) |
| Pulley |
1-groove V-belt, 74mm OD |
| Regulator |
Internally regulated (IR) |
| Fan Type |
Internal (IF) |
| Engine Application |
Isuzu 3LD1 / 3LD2 diesel |
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 27C ZTS Excavator |
All Years |
| John Deere 27ZTS Excavator |
All Years |
| John Deere 35 & 35C ZTS Excavator |
All Years |
| John Deere 35ZTS Excavator |
All Years |
| John Deere 50C ZTS Excavator |
All Years |
| John Deere 50ZTS Excavator |
All Years |
| Isuzu 3LD1 / 3LD2 Industrial Engines |
All Years |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| AT195649 |
John Deere |
| 8972251170 |
Isuzu |
Frequently Asked Questions
Will this alternator fit my excavator without modification?
Yes, it is built to the original John Deere ZTS 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?
Signs include a charging warning light, low system voltage, or the battery not holding charge during operation.
Does this fit every John Deere excavator model?
No - it is built for the ZTS models listed above with the Isuzu 3LD1/3LD2 engine. If your machine is not listed, check your original unit against John Deere AT195649 or Isuzu 8972251170 before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
