The Bomag 05901231 Back-Up Ring is a genuine OEM sealing component designed for Bomag BW 177 and BW 179 series single drum rollers. Sourced directly from Bomag, this replacement meets the exact material and dimensional specifications of the original part. This back-up ring is confirmed to fit a wide range of BW 177 and BW 179 variants, including BW 177 DH-3 USA, BW 177 PDH-4, BW 179 DH-4, BW 179 DHC-4, BW 177 DH-5, BW 177 PDH-5, BW 177 BVC-5, BW 145 DH-5, BW 145 PDH-5, and BW 177-5 single drum rollers, among others. Ordering by part number 05901231 ensures you receive the correct component the first time.
Key Features
- Genuine OEM Sealing Integrity — manufactured to Bomag's original material hardness and compression tolerances, ensuring the back-up ring prevents seal extrusion under hydraulic pressure exactly as the factory design intended.
- Direct-Fit Replacement — dimensionally identical to the original, this back-up ring seats correctly in its groove without rework, keeping hydraulic circuit reassembly straightforward.
- Broad BW 177 and BW 179 Coverage — compatible with multiple generation variants including -3, -4, -40, -50, and -5 suffix models across both the BW 177 and BW 179 single drum roller families, as well as BW 145 DH-5 and BW 145 PDH-5 machines.
- Hydraulic System Protection — a correctly fitted back-up ring prevents the primary O-ring from being forced into the clearance gap under pressure, maintaining leak-free hydraulic performance and protecting downstream components.
- Fuel and Hydraulic Safety Assurance — using the correct OEM-spec back-up ring in hydraulic assemblies reduces the risk of seal failure, fluid loss, and pressure drop that can compromise safe machine operation.
A back-up ring is a rigid or semi-rigid support ring installed alongside an O-ring in a hydraulic joint or cylinder. Its job is to prevent the softer O-ring from being pushed into the gap between mating surfaces when the system is under pressure — a condition known as extrusion, which quickly destroys the primary seal. On single drum rollers like the BW 177 and BW 179 series, hydraulic systems power drum vibration, propulsion, and steering, so seal integrity is critical to keeping these functions performing correctly. When a back-up ring wears, hardens, or is damaged, the O-ring it supports becomes vulnerable to extrusion, leading to hydraulic leaks, loss of pressure, and accelerated seal failure throughout the assembly.
Part Details
| Part Number | 05901231 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Back-Up Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Single Drum Roller | BW 177 DH-3 USA | 00817677 |
| Single Drum Roller | BW 177 PDH-3 USA | 00817679 |
| Single Drum Roller | BW 177 PDH-4 | 00817763, 00818541 |
| Single Drum Roller | BW 177 DH-4 | 00817765, 00818453, 00818543, 00824037, 00824133 |
| Single Drum Roller | BW 179 DH-4 | 00817767, 00818545, 00824137 |
| Single Drum Roller | BW 179 PDH-4 | 00817769, 00818549, 00824139 |
| Single Drum Roller | BW177DH 3 | 00817865 |
| Single Drum Roller | BW 179 DHC-4 | 00818033, 00818547 |
| Single Drum Roller | BW 177 DHC-4 | 00818035, 00818455 |
| Single Drum Roller | BW 177 DH-40 | 00818169 |
| Single Drum Roller | BW 177 PDH-40 | 00818171 |
| Single Drum Roller | BW 177 PDHC-4 | 00818283, 00818539 |
| Single Drum Roller | BW 179 PDHC-4 | 00818285 |
| Single Drum Roller | BW177PDH 40 | 00818585 |
| Single Drum Roller | BW 177 DH-50 | 00824089 |
| Single Drum Roller | BW 177 PDH-50 | 00824091 |
| Single Drum Roller | BW 145 DH-5 | 00824471, 00825721 |
| Single Drum Roller | BW 145 PDH-5 | 00824473, 00825723 |
| Single Drum Roller | BW 177 DH-5 | 00824475, 00824917, 00825435, 00825727 |
| Single Drum Roller | BW 177 PDH-5 | 00824477, 00825437, 00825729 |
| Single Drum Roller | BW 177BVC-5 | 00824479 |
| Single Drum Roller | BW 177-5 | 00825731 |
| Single Drum Roller | BW 177 PDH-5 PL | 00827075 |
| Single Drum Roller | BW 177 DH-5 PL | 00827077, 00827377 |
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.
