The Wacker Neuson Upper Mass is a genuine OEM component designed for DPU80r and DPU90r series reversible plate compactors, including the DPU80rLec670, DPU80rLem670, DPU80rLec770, DPU80rLem770, DPU90rLec770 US, DPU90rLem770 US, and the DPU 80/110(r) KMAT vibration plate. Sourced directly from Wacker Neuson, part is manufactured to the same specifications as the original component your machine was built with. This ensures a correct, straightforward installation without the guesswork of adapting an incompatible part. If your compactor is showing signs of excessive vibration transfer to the operator or reduced isolation efficiency, replacing the Upper Mass is a critical step in restoring proper performance.
Key Features
- Genuine OEM Mass-to-Isolation Integrity — Manufactured by Wacker Neuson to the exact material density and dimensional tolerances required for correct vibration isolation between the compaction system and the upper frame.
- Direct Drop-In Replacement — Engineered to mount to the same attachment points as the original, keeping disassembly and reassembly straightforward on compatible machines.
- Broad DPU Series Compatibility — Fits DPU80r and DPU90r model lines including Lec and Lem variants across 670 and 770 configurations, as well as the DPU 80/110(r) KMAT vibration plate.
- Restored Operator Comfort — A correctly functioning Upper Mass absorbs and decouples compaction forces from the operator handles; a worn or degraded mass allows excessive vibration to transfer upward, increasing operator fatigue and reducing control.
- Vibration Exposure Compliance — Maintaining the Upper Mass in serviceable condition is directly tied to keeping hand-arm vibration transmission within acceptable operating levels, which matters for operator health and site safety compliance.
The Upper Mass is a core component of the anti-vibration system on reversible plate compactors. It works in conjunction with vibration-dampening mounts to isolate the high-frequency compaction forces generated by the exciter unit from the machine's upper frame and handle assembly. When the Upper Mass is worn, cracked, or otherwise compromised, that isolation breaks down — vibration passes directly through to the operator, handle response becomes unpredictable, and over time the additional stress can accelerate wear on surrounding components. Keeping this part in good condition is essential to maintaining both machine longevity and safe, comfortable operation on the job.
Part Details
| Part Number | 5100004991 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Upper Mass |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| DPU80rLec670 | DPU80rLec670 | 5100027033 |
| DPU80rLec770 | DPU80rLec770 | 5100027034 |
| DPU80rLem670 | DPU80rLem670 | 5100024697 |
| DPU80rLem770 | DPU80rLem770 | 5100024698 |
| DPU90rLec770 US | DPU90rLec770 US | 5100028359 |
| DPU90rLem770 | DPU90rLem770 US | 5100028358 |
| Vibration Plate DPU 80-110(r) KMAT | DPU 80/110 KMAT | 5100016604 |
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.
