The Wacker Neuson Valve Rotator is a genuine OEM component designed for a broad range of Wacker Neuson equipment including ML440 Light Towers, MG5 and MG5sd Portable Generators, MDP3 Trash Pumps, and MPU 29 Reversible Plates. As a direct source replacement, part is manufactured to the exact tolerances required for correct valve train operation across all listed machine families. Sourcing a genuine OEM Valve Rotator means no guesswork on fitment — this is the same part shipped in new Wacker Neuson equipment. Keep a spare on hand to protect uptime across any of the compatible models in your fleet.
Key Features
- Genuine OEM Valve Rotation Spec — Manufactured to the exact rotational torque and geometry spec required for consistent valve stem engagement, preventing uneven wear across the valve face.
- Drop-In Engine Replacement — Installs directly onto the valve stem tip using the original retainer interface, requiring no machining or adaptation to seat correctly.
- Wide Fleet Compatibility — A single part number covers ML440 Light Towers, MG5 and MG5sd Portable Generators, MDP3 Trash Pumps, and MPU 29 Reversible Plates, making it a practical stocking part for mixed Wacker Neuson fleets.
- Protects Valve and Seat Longevity — A functioning Valve Rotator keeps carbon deposits from accumulating on one spot of the valve face; a worn or seized rotator leads to hot spots, valve burning, and accelerated seat erosion.
- Fuel System Integrity — Proper valve rotation supports consistent compression and combustion sealing, which is critical to safe, stable engine operation in generator and pump applications where load demand is continuous.
A Valve Rotator is a small but mechanically critical component mounted at the tip of an engine's exhaust or intake valve. Each time the valve opens, the rotator causes the valve to turn slightly on its stem, distributing heat and contact stress evenly around the full circumference of the valve face and seat. Without this rotation, one area of the valve absorbs repeated thermal stress, causing carbon buildup, hot spots, and eventually valve burning or seat recession. A failed or seized Valve Rotator typically presents as loss of compression, misfiring, or overheating — symptoms that can be misdiagnosed as carburetor or ignition problems until the valve train is inspected directly.
Part Details
| Part Number | 5000404158 |
|---|---|
| Old Part Number | 0404158 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Valve Rotator |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Light Towers | ML440 | 5000630117, 5000630204, 5000630323, 5000630324, 5000630325, 5000630327 |
| Portable Generators | MG5 | 5000630137, 5000630143, 5000630233, 5000630254, 5000630224, 5000630229, 5000630237, 5000630239, 5000630252, 5000630308, 5000630310, 5000630334 |
| Trash Pumps | MDP3 | 5000630140, 5000630144, 5000630176, 5000630177 |
| Reversible Plates | MPU 29 | 5000630141, 5000630228 |
| Portable Generators | MG5sd | 5000630202, 5000630214, 5000630236 |
| MG5 Generator | MG5d | 5000630211 |
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.
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