The Bomag 05903511 Valve Seat is a genuine OEM component designed for Bomag tandem rollers across the BW 100, BW 120, BW 125, BW 131, BW 135, and BW 138 series, including AC-4, AD-4, AC-5, and AD-5 variants. Sourced directly from Bomag, this valve seat delivers the exact material grade, seating geometry, and dimensional tolerances required by the original engine specification. Compatible models include the BW 100 AD-4, BW 120 AD-5, BW 125 AD-4, BW 138 AD-5, BW 135 AD-5, and BW 131 AD-5, among others. When you need a confirmed OEM fit for your tandem roller's engine, part number 05903511 is the correct replacement to specify.
Key Features
- OEM Seating Geometry — Manufactured to Bomag's original dimensional specification, ensuring the correct valve-to-seat contact angle and surface finish for consistent compression and sealing.
- Direct Engine Drop-In — This valve seat installs directly into the cylinder head to OEM tolerances, matching the original press-fit diameter and depth without secondary machining.
- Broad Tandem Roller Coverage — Fits Bomag BW 100, BW 120, BW 125, BW 131, BW 135, and BW 138 tandem rollers across both AC and AD drive configurations, including generation-4 and generation-5 variants.
- Compression Integrity Maintained — A correctly seated valve seat preserves combustion chamber sealing; a worn or damaged seat causes compression loss, rough running, and accelerated valve and guide wear.
- Genuine Bomag Part — Supplied as an authentic Bomag OEM component under part number 05903511, carrying full traceability back to the original equipment manufacturer.
A valve seat is the hardened insert pressed into the cylinder head that provides the precise mating surface against which the engine valve closes. Each time the valve shuts, it contacts this seat to form a gas-tight seal that holds combustion pressure inside the cylinder. Over time, repeated valve impact and high operating temperatures cause the seat to wear, pit, or recess, which degrades the seal and allows compression and combustion gases to escape — reducing engine power, increasing fuel consumption, and eventually causing engine damage. Replacing a worn valve seat with a correctly specified OEM component restores the sealing surface and returns the engine to full operating efficiency.
Part Details
| Part Number | 05903511 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Valve Seat |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 100 AD-4 | 00818465, 00824271, 00824273 |
| Tandem Roller | BW 120 AD-4 | 00818469, 00818477, 00818593, 00818733, 00824173 |
| Tandem Roller | BW 120 AC-4 | 00818471, 00818597 |
| Tandem Roller | BW 125 AD-4 | 00818473 |
| Tandem Roller | BW 125 AC-4 | 00818475 |
| Tandem Roller | BW 138 AC-5 | 00818719, 00824929 |
| Tandem Roller | BW 138 AD-5 | 00818721, 00824175, 00824927, 00825351 |
| Tandem Roller | BW 135 AD-5 | 00818723, 00824931, 00825355 |
| Tandem Roller | BW 100 AC-4 | 00818731 |
| Tandem Roller | BW120AD 4 | 00818871 |
| Tandem Roller | BW 100 AD-5 | 00824029, 00824561, 00824833, 00824995, 00825357, 00825643, 00826215 |
| Tandem Roller | BW 120 AC-5 | 00824031, 00824839, 00825363 |
| Tandem Roller | BW 120 AD-5 | 00824033, 00824563, 00824835, 00824997, 00825359, 00825645, 00826217 |
| Tandem Roller | BW 100 AC-5 | 00824275, 00824837, 00825361 |
| Tandem Roller | BW 131 AD-5 | 00824935 |
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.
