The Wacker Neuson Valve Adjusting Nut is a genuine OEM component designed for a wide range of Wacker Neuson equipment, including MG3 and MG5 Portable Generators, MP15 and MP70 Single Direction Plates, ML225, ML240, ML425, and ML440 Light Towers, MFS12 and MFS14 Floor Saws, MDP3 Trash Pumps, MPU 29 Reversible Plates, MFP1.5 and MFP2 Fire Pumps, and MD3.5 Modular Internal Vibrators. Sourced directly from Wacker Neuson, part meets the exact tolerances required for correct valve clearance adjustment across all covered models. Keeping the valve train properly set is critical to engine efficiency and long-term performance, making this a key service part for any scheduled maintenance interval. When you need an exact replacement, the genuine OEM designation ensures this nut matches the original hardware specification without compromise.
Key Features
- Genuine OEM Fit and Finish — Manufactured to the same thread pitch, hardness, and dimensional tolerances as the original hardware, ensuring correct torque behavior during valve adjustment.
- Direct Drop-In Replacement — Threads directly onto the valve adjuster without reworking or re-tapping, compatible with the existing adjustment screw assembly across all listed models.
- Broad Cross-Fleet Compatibility — Fits MG3 and MG5 Portable Generators, MP15 and MP70 Single Direction Plates, ML-series Light Towers, MFS Floor Saws, MDP3 Trash Pumps, MPU 29 Reversible Plates, MFP Fire Pumps, and MD3.5 Modular Internal Vibrators.
- Valve Clearance Integrity — A correctly seated valve adjusting nut locks the adjuster screw in position after setting, preventing drift that would cause incorrect valve timing, rough running, or loss of compression.
- Engine Safety and Compliance — Proper valve adjustment maintained by a secure locking nut is essential to avoiding engine overheating and valve damage — critical for fire pumps and generators operating under load in demanding conditions.
The valve adjusting nut is a small but essential part of the engine's valve train adjustment system. During a valve clearance service, the technician sets the gap between the rocker arm and valve stem using an adjuster screw, and the valve adjusting nut is then tightened down to lock that screw firmly in position. Without a properly functioning nut holding the adjuster in place, valve clearance can shift during operation, leading to symptoms such as tapping noises, reduced power, difficulty starting, or accelerated valve and seat wear. On equipment like generators and pumps that run continuously under load, maintaining correct valve clearance directly affects both fuel efficiency and engine longevity.
Part Details
| Part Number | 5000403998 |
|---|---|
| Old Part Number | 0403998 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Valve Adjusting Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| MP15 | MP15 | 5000630131, 5000630227 |
| Light Towers | ML440 | 5000630117, 5000630204, 5000630323, 5000630324, 5000630325, 5000630327 |
| Light Towers | ML240 | 5000630118, 5000630205, 5000630326 |
| Light Towers | ML425 | 5000630119, 5000630206 |
| Light Towers | ML225 | 5000630120, 5000630207 |
| Modular Internal Vibrators | MD3.5 | 5000630242 |
| Single Direction Plate | MP70 | 5000630243 |
| Single Direction Plates | MP15-CE | 5000630338 |
| 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 |
| Floor Saw | MFS14 | 5000630186, 5000630221 |
| Floor Saw | MFSX14 | 5000630246 |
| Portable Generators | MG3 | 5000630142, 5000630135, 5000630256, 5000630225, 5000630230, 5000630234, 5000630238, 5000630240, 5000630253, 5000630309, 5000630311, 5000630335 |
| Floor Saw | MFS12 | 5000630187, 5000630220 |
| Portable Generators | MG3sd | 5000630201, 5000630215, 5000630235 |
| Portable Generators | MG5sd | 5000630202, 5000630214, 5000630236 |
| MG5 Generator | MG5d | 5000630211 |
| MG3 Generator | MG3d | 5000630213 |
| Fire Pump | MFP1.5 | 5000630258 |
| Fire Pump | MFP2 | 5000630259 |
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.
