The Bomag 78021021 Water Tank is a genuine OEM replacement designed for BW 100 and BW 120 series tandem rollers, including the BW 100 AC-3, BW 100 AD-3, BW 120 AC-3, and BW 120 AD-3. Sourced directly from Bomag, this water tank carries the same part number and build specification as the original component installed at the factory. It installs as a direct replacement with no guesswork on fitment, making it the straightforward choice for fleet maintenance and repair.
Key Features
- Genuine OEM Construction — manufactured to Bomag's original material and capacity specifications, ensuring the tank holds and delivers the correct water volume for consistent drum wetting performance
- Direct Replacement Fit — matches the original mounting configuration and connection points on BW 100 and BW 120 series tandem rollers for a clean, straightforward swap
- Broad Series Coverage — fits BW 100 AC-3, BW 100 AD-3, BW 120 AC-3, BW 120 AD-3, and BW 120 AD-3 tandem rollers, covering multiple variants across the series
- Sustained Drum Wetting — a properly functioning water tank keeps the drums adequately wetted during asphalt compaction passes, preventing material pickup and surface tearing
- Verified Part Number — ordering by Bomag part number 78021021 confirms you receive the correct tank geometry and fitting size for your machine, eliminating the risk of an incompatible substitute
The water tank on a tandem roller feeds the drum wetting system, supplying water that is sprayed or dripped onto the drum surfaces during asphalt compaction to prevent hot mix from sticking to the steel. Without a fully intact, leak-free tank, the water supply drops off, leading to material adhesion on the drums that damages the mat surface and forces the operator to stop work. A cracked, corroded, or otherwise compromised tank should be replaced promptly to maintain smooth, uninterrupted compaction passes.
Part Details
| Part Number | 78021021 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Water Tank |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 100 AC-3 | 00817457 |
| Tandem Roller | BW 100 AD-3 | 00817458 |
| Tandem Roller | BW 120 AC-3 | 00817462 |
| Tandem Roller | BW 120 AD-3 | 00817463, 00817831, 00817833 |
| Tandem Roller | BW120AD 3 | 00817571 |
| Tandem Roller | BW120 AD-3 | 00817849 |
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.
