The Wacker Neuson Piston Pin is a genuine OEM component designed for ML440 Light Towers and MG5 series Portable Generators. Sourced directly from Wacker Neuson, this part carries the same specifications as the original installed at the factory, ensuring a correct, drop-in fit with no guesswork. The is confirmed compatible across a wide range of ML440 and MG5 model configurations, including MG5sd and MG5d variants. Keep a spare on hand to minimize engine downtime on the job.
Key Features
- OEM Dimensional Accuracy — Manufactured to the exact diameter and surface finish tolerances required for proper piston-to-pin clearance, preventing excessive wear or slop in the pin bore.
- Direct Engine Replacement — Drops into the piston pin bore and connecting rod small end without machining or fitting, restoring the original assembly geometry.
- Broad ML440 & MG5 Fitment — Compatible with ML440 Light Tower series and the full MG5 Portable Generator family, including MG5, MG5sd, and MG5d model configurations.
- Protects Engine Integrity — A correctly fitted piston pin transfers combustion loads smoothly between the piston and connecting rod; a worn or loose pin causes knocking, accelerated bore wear, and eventual engine failure.
- Genuine Wacker Neuson Part — Part number 5000404858 is an authentic OEM replacement, giving you confidence that the part matches the original specification for material grade and hardness.
The piston pin — sometimes called a wrist pin — connects the piston to the small end of the connecting rod inside the engine cylinder. It acts as the pivot point that converts the up-and-down motion of the piston into the rotational force that drives the crankshaft. When a piston pin wears, becomes loose in its bore, or develops surface damage, it creates audible knocking, increases blow-by past the piston rings, and can ultimately cause catastrophic engine damage if left unaddressed. Replacing a worn pin promptly with a correctly sized OEM part restores proper combustion transfer and protects the surrounding engine components.
Part Details
| Part Number | 5000404858 |
|---|---|
| Old Part Number | 0404858 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston Pin |
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 |
| 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.
