The Wacker Neuson Valve Spring is a genuine OEM component designed for ML440 Light Towers, MG5 Portable Generators, MDP3 Trash Pumps, and MPU 29 Reversible Plates. As a direct OEM part sourced through Wacker Neuson's authorized parts network, the meets the exact specifications of the original component installed at the factory. This wide fitment range makes it a dependable go-to replacement across multiple Wacker Neuson equipment families. Confirm your model number before ordering to ensure a direct match.
Key Features
- Genuine OEM Spring Tension Integrity — Manufactured to the precise load and coil specifications required to seat and seal the valve correctly — no guesswork on spring rate or free length.
- Drop-In Engine Valve Compatibility — Engineered to seat directly into the existing valve retainer and keeper groove without modification, streamlining installation during top-end engine service.
- Broad Wacker Neuson Fitment — Covers ML440 Light Tower, MG5 Portable Generator, MG5sd and MG5d Generator, MDP3 Trash Pump, and MPU 29 Reversible Plate model lines.
- Consistent Valve Timing and Compression — A properly tensioned valve spring holds the valve closed at the right moment, preserving compression and combustion efficiency across the engine's operating range.
- Fuel System Safety Assurance — Correct spring tension prevents valve float and incomplete seating, which can allow unburned fuel to enter the exhaust — a genuine concern on generator and pump applications running under sustained load.
A valve spring holds the engine's intake or exhaust valve firmly against its seat whenever the camshaft lobe is not actively pushing it open. This constant tension is what maintains compression inside the cylinder and keeps combustion gases from escaping at the wrong time. When a valve spring weakens, cracks, or breaks, the affected valve can float, stick open, or seat unevenly — causing a noticeable drop in power output, rough running, or hard starting. On equipment like portable generators and trash pumps that often run for extended periods under load, a failed valve spring can quickly escalate from a performance issue to a stopped machine.
Part Details
| Part Number | 5000404156 |
|---|---|
| Old Part Number | 0404156 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Valve Spring |
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.
