The Wacker Neuson Starter Relay Switch is a genuine OEM component designed for the RD27-100 and RD27-120 series hydrostatic vibratory rollers, including standard and Traction Control configurations. Sourced directly from Wacker Neuson, this part meets the exact electrical specifications of the original switch installed at the factory. It covers a wide range of RD27 roller variants, making it the correct replacement choice for this tandem roller family. Verify your machine's model number against the fitment list before ordering to ensure accurate application.
Key Features
- Genuine OEM Electrical Specification — Matched to the correct switching voltage and current rating for the RD27 roller starting circuit, ensuring the starter engages cleanly without voltage drop or relay chatter.
- Direct Plug-In Replacement — Connects to the existing wiring harness without splicing or adapter hardware, returning the starting circuit to its original configuration.
- Broad RD27 Series Coverage — Fits RD27-100 and RD27-120 hydrostatic vibratory rollers across multiple machine configurations, including standard and Traction Control variants.
- Protects the Starting System — A properly functioning starter relay isolates high-amperage starter current from the ignition switch, preventing premature switch wear and protecting downstream electrical components.
- Critical Ignition Circuit Component — A failed or intermittent relay switch is a common cause of no-start conditions on RD27 rollers; replacing it with the correct OEM part restores dependable engine startup.
The starter relay switch acts as an electrically operated gate between the ignition circuit and the high-current starter motor circuit. When the operator turns the key, a low-amperage signal from the ignition switch energizes the relay coil, which closes internal contacts and allows the full amperage needed to crank the engine to pass through safely. Without a functioning relay, the starter motor cannot receive adequate current, resulting in slow cranking, intermittent starts, or a complete no-start condition. Over time, the internal contacts can burn, corrode, or fail to close reliably, making this switch a common service item on diesel-powered compaction rollers that see frequent start cycles.
Part Details
| Part Number | 5000161590 |
|---|---|
| Old Part Number | 0161590 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Starter Relay Switch |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Hydrostatic Vibratory Roller | RD27-100 | 5000620393, 5000620508, 5000620510, 5000620512, 5000620395, 5200009322, 5000620007, 5000620037 |
| Hydrostatic Vibratory Roller | RD27-120 | 5000620394, 5000620509, 5000620511, 5000620513, 5000620396, 5200009323, 5000009469, 5000620038 |
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.
