Bomag Back-Up Ring | Part 05901554

The Bomag 05901554 Back-Up Ring is a genuine OEM sealing component designed for Bomag BC-series refuse/landfill compactors and soil compactors, including the BC 671 RB, BC 771 RB, BC 772 RB, BC 672 RB, BC 771 RS, BC 772 RS, BC 772 EB-2, BC 672 EB-2, and their subsequent generation variants. Sourced directly from Bomag, this back-up ring is manufactured to the same tolerances and material specifications as the original, ensuring a drop-in fit with no dimensional compromise. Confirmed fitment spans the full BC-series lineup covered under part number 05901554, giving operators and fleet managers confidence in compatibility before the order is placed.

Key Features

• Genuine OEM Sealing Integrity — manufactured to Bomag's original material and compression specifications, delivering the extrusion resistance expected from a hydraulic back-up ring in heavy compactor service
• Direct OEM Replacement — dimensionally identical to the original, this back-up ring seats into existing grooves on BC-series compactors without rework or shimming
• Broad BC-Series Coverage — fits BC 671 RB, BC 771 RB, BC 771 RS, BC 772 RB, BC 772 RS, BC 672 RB, BC 772 RB-2, BC 672 RB-2, BC 772 RS-2, BC 772 EB-2, BC 672 EB-2, BC 772 RB-3, BC 672 RB-3, BC 772 RS-3, BC 772 RB-4, BC 772 RS-4, BC 672 RB-4, and BC 772 EB-4 refuse/landfill and soil compactors
• Hydraulic System Protection — a correctly seated back-up ring prevents seal extrusion under high hydraulic pressure, keeping cylinders and actuators leak-free and fully responsive during compaction cycles
• Hydraulic Leak Prevention — a worn or missing back-up ring allows the primary seal to cold-flow into clearance gaps, causing fluid loss, pressure drop, and potential cylinder damage — replacing it at the first sign of weeping stops that progression

A back-up ring works alongside the primary hydraulic seal to prevent seal extrusion — the condition where high operating pressure forces the softer seal material into the small gap between mating hydraulic components. Positioned on the low-pressure side of the primary seal, the back-up ring acts as a rigid support that keeps the seal properly seated under the extreme pressure cycles generated by compactor hydraulic systems. When a back-up ring degrades or is missing entirely, the primary seal extrudes into the clearance gap, leading to accelerated seal wear, hydraulic fluid leakage, and loss of cylinder force — making timely replacement essential for maintaining full compaction performance.

Part Details

Compatibility & Fitment

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.