Bomag 05766434 Marginal Relay

The Bomag 05766434 Marginal Relay is a genuine OEM electrical component designed for Bomag BC-series refuse and landfill compactors and BW-series tandem rollers. Sourced directly from Bomag, this relay matches the original specification for a correct, consistent connection within the machine's electrical system. This part is confirmed to fit the BC 571 RB, BC 671 RB, BC 671 RS, BC 672 RB, BC 771 RB, BC 771 RS refuse and landfill compactors, as well as the BW 170 AD, BW 170 AD-2 AM, BW 174 AC, BW 174 AC AM, BW 174 AC-2, BW 174 AC-2 AM, BW 174 AD, BW 174 AD AM, BW 174 AD-2, and BW 174 AD-2 AM tandem rollers. Choosing a genuine OEM replacement means the electrical circuit performs exactly as Bomag engineered it — no guesswork, no adaptation.

Key Features

• Genuine OEM Electrical Accuracy — matched to the original switching specification for correct voltage thresholds and circuit protection behavior specific to this relay's role in the machine
• Drop-In Replacement — engineered to the same connector and mounting configuration as the original, so installation follows the same procedure as the part being replaced
• Broad Verified Fitment — confirmed for BC-series refuse and landfill compactors including the BC 571 RB, BC 671 RB, BC 671 RS, BC 672 RB, BC 771 RB, and BC 771 RS, plus BW 174 and BW 170 tandem rollers across multiple variants
• Consistent Circuit Control — a properly functioning marginal relay ensures the targeted electrical circuit switches reliably under the correct conditions, maintaining machine function and operator control
• Electrical System Integrity — a failing relay can cause erratic operation, unexpected circuit behavior, or complete loss of the controlled function; replacing with a genuine part restores the designed switching margin

A marginal relay is an electrically operated switch that activates or deactivates a specific circuit when a voltage or signal reaches a defined threshold. In heavy compaction equipment, relays like this one manage discrete functions within the machine's wiring harness — controlling everything from auxiliary systems to operational interlocks. When a relay degrades or fails, the circuit it governs may behave intermittently, fail to activate, or remain stuck in one state, leading to loss of the controlled function. Replacing it with a genuine Bomag part, part number 05766434, restores the correct switching behavior and keeps the electrical system operating as designed.

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.