The Wacker Neuson 5100012421 is a genuine OEM Locking Ring designed for the RD18, RD40, and RD45 series tandem rollers. Sourced directly from Wacker Neuson, this part carries the same specifications as the component originally installed at the factory. Fitment covers a wide range of RD-series configurations including standard, combination, and open-drum variants across US and international builds. If your tandem roller is showing signs of looseness, vibration irregularities, or component migration at a rotating or retained assembly, part number 5100012421 is the correct OEM replacement to restore proper retention.
Key Features
- Genuine OEM Construction: — Manufactured to Wacker Neuson's original dimensional tolerances, ensuring the ring seats, locks, and retains with the same holding force as the original component.
- Drop-In Replacement: — Engineered to the same profile and diameter as the original, allowing direct installation without reworking the surrounding assembly.
- Broad RD-Series Coverage: — Compatible with RD18-80, RD18-100, RD40-130, RD45-140, and their C, O, and .3 variants, including US-market and SE-designated machines.
- Maintains Drum and Drive Integrity: — A correctly seated locking ring prevents axial movement in rotating assemblies, keeping drum alignment true and protecting adjacent components from wear caused by unwanted play.
- Verified by Part Number: — Cross-reference Wacker Neuson part number 5100012421 against your machine's serial number and model designation before ordering to confirm application accuracy.
A locking ring is a retention component used to secure a shaft, bearing, or rotating assembly within its housing, preventing axial movement during operation. In a tandem roller, where both drums generate continuous vibration force, any looseness at a locking ring can accelerate bearing wear, cause drum misalignment, and compromise compaction performance across the full width of the machine. When the locking ring fails or becomes damaged, the retained assembly loses its fixed position, leading to irregular drum contact, increased mechanical stress on surrounding parts, and potential for more extensive drivetrain damage if not addressed promptly.
Part Details
| Part Number | 5100012421 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Locking Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD40-130 Tandem Roller | RD40-130 US | 5100021801 |
| RD40-130o.3 | RD40-130o.3 | 5100047399 |
| RD18-80 | RD18-80 | 5100047360, 5100055774, 5100011382 |
| RD45-140c | RD45-140c | 5100047385 |
| RD18-100 Tandem Roller | RD18-100 US | 5100027573 |
| RD18-100 C Tandem Roller | RD18-100 C US | 5100027574 |
| RD40-130 | RD40-130 | 5100047382, 5100011391 |
| RD40-130c | RD40-130c | 5100047384 |
| RD18 | RD18-100.3 | 5100055947 |
| RD45-140 O Tandem Roller | RD45-140O US | 5100021806 |
| RD40-130o | RD40-130o | 5100047386 |
| RD45-140c.3 | RD45-140c.3 | 5100047398 |
| RD45-140 Tandem Roller | RD45-140 | 5100011392, 5100047383 |
| RD18-100 C Tandem Roller | RD18-100 C | 5100011384 |
| RD18-100 | RD18-100 | 5100055775, 5100011383, 5100047361 |
| RD45-140 C Tandem Roller | RD45-140 C | 5100011394 |
| RD40-130 O | RD40-130 O | 5100011395 |
| RD45-140o | RD45-140o | 5100047387 |
| RD18-80 Tandem Roller | RD18-80 US | 5100027572 |
| RD18-80.3 | RD18-80.3 | 5100055946 |
| RD40-130 C Tandem Roller | RD40-130C US | 5100021803 |
| RD45-140 O Tandem Roller | RD45-140 O | 5100011396 |
| RD45-140 Tandem Roller | RD45-140 US | 5100021802 |
| RD40-130 C Tandem Roller | RD40-130 C | 5100011393 |
| RD45-140.3 | RD45-140.3 | 5100047396 |
| RD40-130.3 | RD40-130.3 | 5100047395 |
| RD45-140o.3 | RD45-140o.3 | 5100047400 |
| Vibration Roller | RD18-100 SE | 5100044989 |
| RD45-140 C Tandem Roller | RD45-140C US | 5100021804 |
| Vibration Roller | RD18-80 SE | 5100044988 |
| RD40-130 O Tandem Roller | RD40-130O US | 5100021805 |
| RD40-130c.3 | RD40-130c.3 | 5100047397 |
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.
