The Wacker Neuson Steering Unit is a genuine OEM component designed for the RD40-130 and RD45-140 series tandem rollers, including standard, C, O, DPF, and US variants across multiple build generations. As a direct factory replacement, this part is sourced and produced to the same specifications as the original unit installed at the time of manufacture. Whether you're servicing a machine from an earlier production run or a current DPF-compliant model, the covers a broad range of configurations across both roller families.
Key Features
- Genuine OEM Hydraulic Precision — Manufactured to the original flow and pressure tolerances required for accurate steering response in compaction equipment.
- Direct-Fit Replacement — Connects to existing hydraulic lines and mounting points as a drop-in replacement, maintaining original plumbing geometry.
- Broad Series Coverage — Fits RD40-130 and RD45-140 tandem rollers across standard, C, O, DPF, and US configurations spanning multiple production generations.
- Sustained Operator Control — A properly functioning steering unit keeps drum articulation smooth and responsive; a worn or leaking unit causes sluggish or unpredictable steering that compromises compaction quality and operator safety.
- Safety-Critical Component — The steering unit directly governs machine direction and articulation; using a genuine OEM part ensures the hydraulic response characteristics meet the original design intent for safe operation.
The steering unit is the hydraulic control component responsible for directing the articulation of a tandem roller's front and rear drum sections in response to operator input. It translates movement at the steering wheel or joystick into precise hydraulic pressure signals that pivot the machine through its articulated joint. When this unit begins to fail — through internal leakage, seal degradation, or spool wear — steering becomes imprecise or unresponsive, making it difficult to maintain straight passes or navigate tight areas on site, and creating potential safety hazards for both the operator and surrounding crew.
Part Details
| Part Number | 5100011989 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Steering Unit |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD40-130 Tandem Roller | RD40-130 | 5100011391, 5100047382 |
| RD45-140 Tandem Roller | RD45-140 | 5100011392, 5100047383 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| RD45-140 C Tandem Roller | RD45-140 C | 5100011394 |
| RD40-130 O | RD40-130 O | 5100011395 |
| RD45-140 O Tandem Roller | RD45-140 O | 5100011396 |
| RD40-130 Tandem Roller | RD40-130 US | 5100021801 |
| RD45-140 Tandem Roller | RD45-140 US | 5100021802 |
| RD40-130 C Tandem Roller | RD40-130C US | 5100021803 |
| RD45-140 C Tandem Roller | RD45-140C US | 5100021804 |
| RD40-130 O Tandem Roller | RD40-130O US | 5100021805 |
| RD45-140 O Tandem Roller | RD45-140O US | 5100021806 |
| RD40-130c | RD40-130c | 5100047384 |
| RD45-140c | RD45-140c | 5100047385 |
| RD40-130o | RD40-130o | 5100047386 |
| RD45-140o | RD45-140o | 5100047387 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD45-140.3 | RD45-140.3 | 5100047396 |
| RD40-130c.3 | RD40-130c.3 | 5100047397 |
| RD45-140c.3 | RD45-140c.3 | 5100047398 |
| RD40-130o.3 | RD40-130o.3 | 5100047399 |
| RD45-140o.3 | RD45-140o.3 | 5100047400 |
| RD40-130 DPF | RD40-130 DPF | 5100055777 |
| RD45-140 DPF | RD45-140 DPF | 5100055778 |
| RD40-130c DPF | RD40-130c DPF | 5100055779 |
| RD45-140c DPF | RD45-140c DPF | 5100055780 |
| RD40-130o DPF | RD40-130o DPF | 5100055781 |
| RD45-140o DPF | RD45-140o DPF | 5100055782 |
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.
