The Wacker Neuson 5100012178 is a genuine OEM Hydraulic Oil Tank designed for the RD40-130 and RD45-140 series tandem rollers. As a direct factory replacement, this tank is built to the same specifications as the original unit installed at the time of manufacture, ensuring correct fluid capacity, port sizing, and mounting geometry for a straightforward installation. This part covers an extensive range of RD40-130 and RD45-140 variants — including standard, open-drum, combination-drum, DPF-equipped, and US-market configurations — making it the right choice for operators and service technicians working across multiple machines in this roller family. Keep your tandem roller hydraulics running clean and at full capacity with this verified OEM replacement.
Key Features
- Correct Fluid Capacity and Port Geometry — Manufactured to OEM dimensions, ensuring the tank holds the correct hydraulic fluid volume and aligns precisely with existing supply and return line ports.
- Genuine Wacker Neuson OEM Component — Sourced directly from Wacker Neuson, this tank meets the same material and construction standards as the original part fitted to the machine.
- Broad RD40-130 and RD45-140 Coverage — Confirmed fitment across standard, open-drum, combination-drum, DPF-equipped, and US-market variants of both the RD40-130 and RD45-140 tandem roller families.
- Protects the Hydraulic Drive System — A properly sealed, correctly sized hydraulic oil tank maintains consistent fluid pressure to the drum drive circuits, preventing overheating, cavitation, and premature pump wear.
- Drop-In Serviceability — Mounts to the existing frame and plumbing connections without modification, supporting efficient field or shop replacement during scheduled maintenance or unplanned repairs.
The hydraulic oil tank serves as the fluid reservoir for the tandem roller's hydraulic drive system, storing and supplying the hydraulic oil that powers drum propulsion, vibration, and steering functions. It also plays a role in cooling and de-aerating the hydraulic fluid as it cycles through the system. A cracked, leaking, or contaminated tank will deplete fluid levels rapidly, leading to loss of drive power, erratic vibration output, and accelerated wear across hydraulic pumps, motors, and valves — making prompt replacement critical to keeping the machine operational and protecting the broader hydraulic circuit.
Part Details
| Part Number | 5100012178 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Hydraulic Oil Tank |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD40-130 O | RD40-130 O | 5100011395 |
| RD40-130 Tandem Roller | RD40-130 | 5100011391, 5100047382 |
| RD40-130c.3 | RD40-130c.3 | 5100047397 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| RD45-140o DPF | RD45-140o DPF | 5100055782 |
| RD45-140 Tandem Roller | RD45-140 | 5100011392, 5100047383 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD40-130o DPF | RD40-130o DPF | 5100055781 |
| RD40-130o | RD40-130o | 5100047386 |
| RD40-130 Tandem Roller | RD40-130 US | 5100021801 |
| RD45-140 O Tandem Roller | RD45-140 O | 5100011396 |
| RD45-140 Tandem Roller | RD45-140 US | 5100021802 |
| RD40-130c | RD40-130c | 5100047384 |
| RD40-130 C Tandem Roller | RD40-130C US | 5100021803 |
| RD40-130 DPF | RD40-130 DPF | 5100055777 |
| RD45-140 O Tandem Roller | RD45-140O US | 5100021806 |
| RD40-130 O Tandem Roller | RD40-130O US | 5100021805 |
| RD40-130o.3 | RD40-130o.3 | 5100047399 |
| RD45-140o.3 | RD45-140o.3 | 5100047400 |
| RD45-140 C Tandem Roller | RD45-140 C | 5100011394 |
| RD40-130c DPF | RD40-130c DPF | 5100055779 |
| RD45-140c.3 | RD45-140c.3 | 5100047398 |
| RD45-140o | RD45-140o | 5100047387 |
| RD45-140 DPF | RD45-140 DPF | 5100055778 |
| RD45-140c DPF | RD45-140c DPF | 5100055780 |
| RD45-140c | RD45-140c | 5100047385 |
| RD45-140 C Tandem Roller | RD45-140C US | 5100021804 |
| RD45-140.3 | RD45-140.3 | 5100047396 |
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.
