The Bomag 05570003 Seat Switch is a genuine OEM component designed for a broad range of Bomag tandem rollers, single drum rollers, and walk-behind rollers, including the BW 135 AD, BW 120 AD-4, BW 124 DH-4, and BW 124 PDH-3, among others. Sourced directly from Bomag, this seat switch meets the original engineering specification for operator presence detection on the machines it serves. It installs as a direct replacement for the factory-fitted unit, requiring no adaptation or rework. Confirm your machine's part number 05570003 against your serial plate before ordering to ensure a correct match.
Key Features
- Genuine OEM Electrical Specification — manufactured to Bomag's original switching threshold and circuit rating, ensuring the operator-presence signal behaves exactly as designed for your roller's control system.
- Drop-In Replacement — matches the original mounting footprint and connector configuration on covered BW-series tandem rollers, single drum rollers, and walk-behind rollers for a straightforward swap.
- Wide Model Coverage — fits an extensive range of Bomag rollers including BW 80 AD-2, BW 90 AD-2, BW 100 AD-3, BW 100 AD-4, BW 120 AC-3, BW 120 AD-3, BW 120 AD-4, BW 125 ADH, BW 125 AD-4, BW 135 AC, BW 135 AD, BW 138 AD, BW 124 DH-3, BW 124 DH-4, BW 124 PDH-3, BW 124 PDH-40, BW 900-2, C 815 C, and additional covered variants.
- Operator Safety Circuit Integrity — the seat switch is a critical safety interlock; a worn or failed switch can disable the machine unexpectedly or, conversely, allow operation without an operator present, creating a hazard on the jobsite.
- Verified Part Number Traceability — part number 05570003 is the Bomag-assigned OEM reference, giving you confidence you are ordering the correct switch for your machine rather than a generic substitute.
The seat switch is an operator-presence sensor mounted beneath the operator's seat. When the operator is seated, the switch closes and enables the machine's drive and compaction systems; when the operator leaves the seat, the switch opens and signals the control system to interrupt or limit machine functions. This interlock is a core element of the roller's safety architecture. A failed or intermittently open seat switch can cause nuisance shutdowns mid-operation, while a switch that fails in the closed position defeats the operator-presence protection entirely — either condition warrants immediate replacement with a correct OEM unit such as the Bomag 05570003.
Part Details
| Part Number | 05570003 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Seat Switch |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 135 AD | 00810120, 00817471, 00818357 |
| Tandem Roller | BW 80 AD-2 | 00810280, 00817566 |
| Tandem Roller | BW 90 AD-2 | 00810281, 00817569, 00818041 |
| Tandem Roller | BW 100 AC-3 | 00817457 |
| Tandem Roller | BW 100 AD-3 | 00817458 |
| Tandem Roller | BW 100 ADM-2 | 00817459 |
| Tandem Roller | BW 120 AC-3 | 00817462 |
| Tandem Roller | BW 120 AD-3 | 00817463, 00817831, 00817833 |
| Single Drum Roller | BW 124 DH-3 | 00817464, 00817634 |
| Single Drum Roller | BW 124 PDH-3 | 00817465 |
| Tandem Roller | BW 125 ACH | 00817466 |
| Tandem Roller | BW 125 ADH | 00817467 |
| Tandem Roller | BW 135 AC | 00817470 |
| Tandem Roller | BW 138 AC | 00817472, 00818361 |
| Tandem Roller | BW 138 AD | 00817473, 00818359 |
| Tandem Roller | BW 80 ADS | 00817567 |
| Tandem Roller | BW 90 AC-2 | 00817568, 00818045 |
| Tandem Roller | BW120AD 3 | 00817571 |
| Tandem Roller | BW 138-AD | 00817572, 00818389 |
| Single Drum Roller | BW124PDH 3 | 00817574, 00818025 |
| Single Drum Roller | C 815 C | 00817575 |
| Tandem Roller | BW 100 AD-4 | 00817685 |
| Tandem Roller | BW 100 AC-4 | 00817687 |
| Tandem Roller | BW 120 AD-4 | 00817689, 00818377 |
| Tandem Roller | BW 120 AC-4 | 00817691 |
| Walk-Behind / Light Roller | BW 900-2 | 00817821, 00818363 |
| Tandem Roller | BW120 AD-3 | 00817849 |
| Tandem Roller | BW 125 AD-4 | 00817937 |
| Tandem Roller | BW 125 AC-4 | 00818271 |
| Single Drum Roller | BW 124 DH-4 | 00818295, 00824495, 00824709 |
| Single Drum Roller | BW 124 PDH | 00818297 |
| Single Drum Roller | BW124DH 4 | 00818311 |
| Single Drum Roller | BW 124 DH-40 | 00818521, 00824499 |
| Single Drum Roller | BW 124 PDH-40 | 00818523, 00824497 |
| Single Drum Roller | C815D | 00818569 |
| Single Drum Roller | BW124PDH-40 | 00818571 |
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.
