The Wacker Neuson 5100012685 Alternator is a genuine OEM alternator designed for the RD-series tandem rollers, covering the RD24-100, RD27-120, RD28-120, RD40-130, and RD45-140 model families across standard, combination, open-ROPS, canopy, DPF, and US-market configurations. As a factory-sourced component, part 5100012685 meets the original engineering specifications set for these machines. Fitment spans a wide range of RD-series variants, making this the correct replacement for operators running multiple roller configurations in their fleet.
Key Features
- Genuine OEM Charging Output: — Sourced directly from Wacker Neuson, this alternator is built to deliver the correct voltage and amperage output for the RD-series electrical system — no guesswork on charging capacity.
- Drop-In Mounting Compatibility: — Engineered to match the original mounting bracket geometry and connector interface, so installation aligns with the existing drive and wiring setup on your roller.
- Broad RD-Series Coverage: — A single part number covers RD24-100, RD27-120, RD28-120, RD40-130, and RD45-140 variants, including standard, open-ROPS, canopy, DPF, and US-spec models.
- Protects Electrical System Integrity: — A failing alternator causes battery drain, erratic instrument readings, and eventual shutdown of the roller mid-operation. A correctly functioning unit keeps the electrical system charged and stable throughout long compaction runs.
- OEM Traceability: — Part number 5100012685 is the Wacker Neuson factory reference, ensuring you are ordering the correct unit for your specific machine build rather than relying on cross-reference approximations.
The alternator is responsible for generating electrical power while the engine is running, keeping the battery charged and supplying current to the machine's electrical loads — lighting, controls, instrumentation, and ancillary systems. On a tandem roller like the RD-series, consistent electrical output is critical for sustained operation; a worn or failed alternator will drain the battery, trigger warning indicators, and ultimately bring the machine to a halt. Replacing the alternator with the correct OEM unit restores proper charging voltage and protects the broader electrical system from the damage that an underperforming unit can cause over time.
Part Details
| Part Number | 5100012685 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Alternator |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD 24-100.3 | RD 24-100.3 | 5100032197 |
| RD24-100 | RD24-100 | 5100047374, 5100011385 |
| RD24-100o.3 | RD24-100o.3 | 5100047372 |
| RD24-100 Tandem Roller | RD24-100 US | 5100021755 |
| RD27-120o | RD27-120o.3 | 5100047373 |
| RD40-130c DPF | RD40-130c DPF | 5100055779 |
| RD28-120 Tandem Roller | RD28-120 US | 5100021756 |
| RD28-120o | RD28-120o | 5100047379 |
| RD45-140.3 | RD45-140.3 | 5100047396 |
| RD45-140c.3 | RD45-140c.3 | 5100047398 |
| RD27-120c | RD27-120c.3 | 5100047371 |
| RD40-130o | RD40-130o | 5100047386 |
| RD27-120 | RD 27-120.3 | 5100032198 |
| RD28-120 O Tandem Roller | RD28-120O US | 5100021800 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD40-130o DPF | RD40-130o DPF | 5100055781 |
| RD24-100 O Tandem Roller | RD24-100O US | 5100021759 |
| RD40-130 | RD40-130 | 5100047382, 5100011391 |
| RD45-140 O Tandem Roller | RD45-140 O | 5100011396 |
| RD40-130c.3 | RD40-130c.3 | 5100047397 |
| RD45-140o DPF | RD45-140o DPF | 5100055782 |
| RD24-100c | RD24-100c | 5100047376 |
| RD45-140 DPF | RD45-140 DPF | 5100055778 |
| RD40-130 C Tandem Roller | RD40-130C US | 5100021803 |
| RD45-140 | RD45-140 | 5100047383, 5100011392 |
| RD40-130c | RD40-130c | 5100047384 |
| RD45-140 O Tandem Roller | RD45-140O US | 5100021806 |
| RD45-140o | RD45-140o | 5100047387 |
| RD45-140c | RD45-140c | 5100047385 |
| RD45-140 C Tandem Roller | RD45-140C US | 5100021804 |
| RD24-100 C Tandem Roller | RD24-100C US | 5100021757 |
| RD40-130o.3 | RD40-130o.3 | 5100047399 |
| RD45-140 Tandem Roller | RD45-140 US | 5100021802 |
| RD45-140c DPF | RD45-140c DPF | 5100055780 |
| RD28-120c | RD28-120c | 5100047377 |
| RD28-120 | RD28-120 | 5100047375 |
| RD24-100c.3 | RD24-100c.3 | 5100047370 |
| RD40-130 Tandem Roller | RD40-130 US | 5100021801 |
| RD40-130 O | RD40-130 O | 5100011395 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| RD24-100 O Tandem Roller | RD24-100 O | 5100011389 |
| RD24-100o | RD24-100o | 5100047378 |
| RD40-130 O Tandem Roller | RD40-130O US | 5100021805 |
| RD45-140 C Tandem Roller | RD45-140 C | 5100011394 |
| RD27-120 O Tandem Roller | RD27-120 O | 5100011390 |
| RD28-120 C Tandem Roller | RD28-120C US | 5100021758 |
| RD40-130 DPF | RD40-130 DPF | 5100055777 |
| RD24-100 C Tandem Rollers | RD24-100 C | 5100011387 |
| RD27-120 Tandem Roller | RD27-120 | 5100011386 |
| RD45-140o.3 | RD45-140o.3 | 5100047400 |
| RD27-120 C Tandem Roller | RD27-120 C | 5100011388 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
