The Wacker Neuson Piston (0.75) is a genuine OEM component designed for the GP3800A and GP3800 series portable generators. As a factory-sourced part, the is manufactured to the exact material and dimensional tolerances required by Wacker Neuson for these machines — ensuring the engine rebuilds or repairs it supports are completed to the original design standard. This Piston (0.75) is confirmed to fit across multiple GP3800A configurations, including standard portable, premium portable, and wheel kit variants, as well as EPA- and CSA-compliant GP3800 models.
Key Features
- OEM Bore Tolerance: — Cast and finished to the exact 0.75 oversize specification required for proper ring seal and compression in GP3800A and GP3800 engines.
- Drop-In Engine Rebuild Fit: — Engineered to seat correctly in the cylinder bore without additional machining, matching OEM pin bore dimensions and crown profile.
- Broad GP3800 Series Coverage: — Fits standard, premium, and wheel kit GP3800A variants, plus EPA and CSA GP3800 models, covering the full generator family in one part number.
- Sustained Compression Output: — A correctly sized oversize piston restores the compression necessary for reliable engine starts and consistent generator power output; a worn or undersized piston leads to blow-by, oil consumption, and loss of output.
- Fuel System Integrity: — Proper piston fit directly affects combustion efficiency and fuel consumption; an ill-fitting piston can cause rich running conditions and excessive exhaust emissions, making correct sizing critical for EPA- and CSA-compliant units.
The piston is the reciprocating component at the heart of the engine's combustion cycle. It moves up and down inside the cylinder bore, compressing the air-fuel mixture on the upstroke and transferring the force of combustion to the crankshaft on the power stroke — ultimately generating the mechanical energy that drives the alternator. An oversize piston, designated by the 0.75 marking, is used during engine reconditioning when the cylinder bore has been bored out to correct wear or damage; using the correct oversize ensures the piston-to-wall clearance is within specification. When a piston is worn, damaged, or incorrectly sized, the engine will suffer from low compression, increased oil burning, hard starting, and reduced or unstable power output.
Part Details
| Part Number | 5000217438 |
|---|---|
| Old Part Number | 0217438 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston (0.75) |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Portable Generator | GP3800A | 5000620104, 5000620379, 5000620485, 5000620342, 5000620484 |
| GP3800A Generator, EPA | GP3800 | 5000620974, 5000620975, 5000620976 |
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.
