The Wacker Neuson Relay is a genuine OEM electrical relay designed for the RD27-100 and RD27-120 tandem roller series, including both the Pro T4F and Basic T4F configurations. As a factory-sourced component, this relay matches the original electrical specifications of the machine, ensuring correct circuit switching behavior right out of the box. It is a direct-fit replacement for worn or failed relays in RD27-series rollers and requires no adaptation to install. Keep this part number on hand as a service spare to minimize interruptions during active compaction work.
Key Features
- OEM-Matched Electrical Specification — Sourced directly from Wacker Neuson, this relay meets the original switching capacity and coil resistance requirements of the RD27 electrical system.
- Drop-In Replacement — Engineered to seat into the original relay socket without modification, maintaining correct connector orientation and circuit integrity.
- Broad RD27 Series Coverage — Fits RD27-100 and RD27-120 tandem rollers across both the Pro T4F and Basic T4F model variants.
- Protects Downstream Electrical Components — A correctly functioning relay ensures controlled, clean switching of circuits, preventing voltage spikes or unintended current draw that can damage other electrical components.
- Electrical System Safety — Relay failure can cause circuits to remain energized or fail to activate, creating unsafe operating conditions; replacing with a verified OEM part restores predictable system behavior.
A relay is an electrically operated switch that controls high-current or safety-critical circuits by using a low-power signal to open or close a larger circuit. On RD27-series tandem rollers, relays are used to manage functions such as engine starting, drum drive engagement, and operator safety interlocks. When a relay fails, the circuit it controls may become inoperative or behave erratically — resulting in the machine failing to start, losing drive function, or triggering false shutdowns. Replacing a faulty relay promptly restores correct electrical behavior and keeps the roller operating as intended.
Part Details
| Part Number | 5200023751 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Relay |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD27-120 ROLLER PRO T4F | RD27-120 | 5200005877, 5200021389 |
| RD27-100 ROLLER PRO T4F | RD27-100 | 5200005876, 5200021387 |
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.
