The Bomag 05901426 Square Ring is a genuine OEM sealing component designed for Bomag MPH and RS-series recyclers and stabilizers. Sourced directly from Bomag, this square ring meets the original design specification and is the correct replacement for machines including the MPH 121, MPH 122, MPH 122-2, MPH 125, MPH 600, MPH 600 3B/4i-PB, MPH 600 EU-FLEX, MPH 364-2, RS 360 TIER-4F, and RS 650. Because sealing integrity is critical in heavy recycler and stabilizer hydraulic and fluid systems, using the right OEM-spec component helps maintain system pressure and prevents contamination. This square ring installs directly in place of the original, with no reworking required to achieve a proper seat.
Key Features
- OEM Sealing Material — manufactured to Bomag's original compound and dimensional spec, ensuring consistent compression and long-term sealing performance in demanding recycler and stabilizer operating conditions
- Exact Profile Fit — the square cross-section profile seats precisely in its groove, eliminating the risk of bypass leaks that a mismatched or worn ring would allow
- Broad MPH and RS Coverage — confirmed fit across the MPH 121, MPH 122, MPH 122-2, MPH 125, MPH 600, MPH 600 3B/4i-PB, MPH 600 EU-FLEX, MPH 364-2, RS 360 TIER-4F, and RS 650 recyclers and stabilizers
- Leak Prevention — a correctly seated square ring keeps hydraulic or fluid circuits sealed under pressure, preventing fluid loss and protecting surrounding components from contamination damage
- Genuine Bomag Part — supplied under part number 05901426 with full OEM traceability, so you can order with confidence that you are receiving the correct component for your machine
A square ring is a sealing element used in hydraulic, fluid, or pneumatic circuits to prevent leakage between mating components. Unlike a round O-ring, its flat-sided square profile provides a wider sealing surface area, which improves stability in the groove and reduces the tendency to twist or roll during assembly or under pressure cycling. In heavy recyclers and stabilizers like the Bomag MPH and RS series, these machines operate under high hydraulic loads and continuous vibration, making seal integrity essential to consistent machine output. When a square ring wears, hardens, or becomes damaged, the result is fluid bypass, pressure drop, and potential contamination of the hydraulic or fluid system — leading to reduced performance and accelerated wear on connected components.
Part Details
| Part Number | 05901426 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Square Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Recycler / Stabilizer | MPH 121 | 00817587 |
| Recycler / Stabilizer | MPH 122 | 00817595 |
| Recycler / Stabilizer | MPH 122-2 | 00818177, 00818727, 00818911, 00824987 |
| Recycler / Stabilizer | MPH 125 | 00818273, 00818681, 00818909 |
| Recycler / Stabilizer | MPH 600 | 00824097, 00824099 |
| Recycler / Stabilizer | MPH 600 3B/4i-PB | 00824645 |
| Recycler / Stabilizer | MPH 600 EU-FLEX | 00824751 |
| Recycler / Stabilizer | MPH 364-2 | 00824973 |
| Recycler / Stabilizer | RS 360 TIER-4F | 00825055 |
| Recycler / Stabilizer | RS 650 | 00825131 |
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.
