The Wacker Neuson Piston Pin Lock is a genuine OEM component designed for a wide range of Wacker Neuson equipment, including the CT36BDT and CT36BDT-E walk-behind trowels, PT2B centrifugal trash pump, PD3B diaphragm pump, PDT2B diaphragm trash pumps, and B 3000 and B 5000 gasoline power units for internal vibrators. As a direct genuine OEM replacement, part is manufactured to the exact tolerances required to secure the piston pin and maintain proper engine assembly integrity. Sourcing the correct locking component is critical — an incorrect or worn piston pin lock can compromise engine reliability and lead to costly internal damage. Keep a spare on hand for planned maintenance or field repairs across your Wacker Neuson fleet.
Key Features
- Genuine OEM Retention Spec: — Manufactured to Wacker Neuson's exact dimensional spec, ensuring the piston pin is locked with the correct retention force — no under- or over-tolerance fitment.
- Drop-In Engine Replacement: — Installs directly into the piston assembly using standard engine rebuild procedures, matching the original circlip or locking ring seat geometry.
- Broad Cross-Family Compatibility: — A single part number covering the CT36BDT/CT36BDT-E trowels, PT2B trash pump, PD3B and PDT2B diaphragm pumps, and B 3000/B 5000 internal vibrator power units.
- Engine Integrity Protection: — A correctly seated piston pin lock prevents lateral pin migration during operation, protecting the cylinder bore, connecting rod, and piston from accelerated wear or catastrophic failure.
- Critical Safety-Adjacent Component: — Piston pin retention is a structural element of the engine's reciprocating assembly; using a correctly spec'd OEM lock reduces the risk of sudden internal engine failure during operation.
The piston pin lock — also known as a circlip or snap ring — secures the piston pin (wrist pin) laterally within the piston bore, preventing it from contacting and scoring the cylinder wall during the engine's reciprocating cycle. It is a small but structurally critical fastener: without proper retention, the piston pin can walk sideways under load, causing severe damage to the cylinder bore and connecting rod in a short period of time. When a piston pin lock becomes worn, cracked, or improperly seated — typically discovered during piston or ring service — it must be replaced before the engine is returned to service.
Part Details
| Part Number | 5000020478 |
|---|---|
| Old Part Number | 0020478 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston Pin Lock |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 915mm/36in Walk-behind Trowel | CT36BDT | 5000008009 |
| 50mm/2in Centrifugal Trash Pum p | PT2B | 5000006722 |
| Gasoline Power Unit for Intern al Vibrator | B 3000 | 5000005829 |
| Gasoline Power Unit for Intern al Vibrator | B 5000 | 5000007522, 5000006307 |
| 915mm/36in Walk-behind Trowel | CT36BDT-E | 5000008010 |
| 75mm/3in Diaphragm Pump | PD3B | 5000006802 |
| 50mm/2in Diaphragm Trash Pump | PDT2B | 5000007612, 5000007613 |
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.
