The Bomag 31791226 Alternator is a genuine OEM component designed for BW 170 AD and BW 174 series tandem rollers. Sourced directly from Bomag, this alternator meets the exact output specifications of the original unit, ensuring your machine's electrical system charges reliably under continuous jobsite demand. This part is confirmed to fit the BW 170 AD, BW 170 AD-2 AM, BW 174 AC, BW 174 AC-2, BW 174 AC-2 AM, BW 174 AC AM, BW 174 ACP-AM, BW 174 AD, BW 174 AD-2, BW 174 AD-2 AM, BW 174 AD AM, BW 174 AP, and BW 174 AP-AM tandem rollers.
Key Features
- OEM Charging Output — Manufactured to the original voltage and amperage specification, this alternator delivers consistent power to the battery and onboard electrical systems without risk of undercharging or overloading.
- Direct-Mount Replacement — Engineered to match the original bracket configuration, belt alignment, and connector interface, allowing straightforward installation without modification to the mounting or wiring harness.
- Broad BW 174 Series Coverage — Fits BW 170 AD, BW 170 AD-2 AM, BW 174 AC, BW 174 AC-2, BW 174 AC-2 AM, BW 174 AC AM, BW 174 ACP-AM, BW 174 AD, BW 174 AD-2, BW 174 AD-2 AM, BW 174 AD AM, BW 174 AP, and BW 174 AP-AM tandem rollers.
- Electrical System Protection — A correctly functioning alternator prevents battery drain, protects sensitive control electronics, and keeps the roller's operational systems running through long compaction shifts.
- Genuine Bomag Quality — As an authentic OEM part, part number 31791226 is held to the same manufacturing tolerances and material standards as the component it replaces, giving you confidence in long-term service life.
The alternator is responsible for generating electrical power while the engine is running, continuously recharging the battery and supplying current to the machine's lights, controls, and other electrical loads. On tandem rollers like the BW 174 series, which rely on stable electrical power for drum drive controls and onboard systems, a failing alternator can cause battery depletion, erratic behavior from electronic components, or a machine that will not restart mid-shift. Replacing a worn or failed alternator with the correct OEM unit restores full charging capacity and protects the rest of the electrical system from the voltage irregularities that a degraded unit can produce.
Part Details
| Part Number | 31791226 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Alternator |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 170 AD | 00817498 |
| Tandem Roller | BW 174 AC | 00817499 |
| Tandem Roller | BW 174 AC AM | 00817500 |
| Tandem Roller | BW 174 AD | 00817501 |
| Tandem Roller | BW 174 AD AM | 00817502 |
| Tandem Roller | BW 174 AD-2 AM | 00817693 |
| Tandem Roller | BW 174 AD-2 | 00817695 |
| Tandem Roller | BW 174 AC-2 | 00817712 |
| Tandem Roller | BW 174 AC-2 AM | 00817714 |
| Tandem Roller | BW 170 AD-2 AM | 00817716 |
| Tandem Roller | BW 174 AP-AM | 00818343 |
| Tandem Roller | BW 174 ACP-AM | 00818355 |
| Tandem Roller | BW 174 AP | 00818395 |
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.
