The Wacker Neuson is a genuine OEM Lock Nut designed for the PDT3, PDT3A, PDI3, PDI3A, and PD3B series 75mm/3in diaphragm trash pumps. Sourced directly from Wacker Neuson, this Lock Nut meets the exact specifications of the original hardware used in these pumps at the time of manufacture. It is confirmed compatible across multiple serial number ranges within the PDT3, PDT3A, PDI3, PDI3A, and PD3B pump families, making it a straightforward service replacement. Order by part number to ensure you receive the correct fastener for your machine.
Key Features
- Genuine OEM Fastener Grade — Manufactured to the exact thread pitch, hardness, and torque spec required for secure retention in diaphragm pump assemblies, where an incorrect or undersized nut can lead to loosening under continuous vibration.
- Drop-In Hardware Replacement — Threads directly into the existing mounting position with no rework needed; the locking feature engages the mating thread the same way as the original fastener.
- Broad Diaphragm Pump Compatibility — Fits multiple configurations across the PDT3, PDT3A, PDI3, PDI3A, and PD3B 75mm/3in diaphragm trash pump families, covering both standard and inline pump layouts.
- Vibration-Resistant Locking Design — The lock nut's interference or prevailing-torque feature resists self-loosening caused by the constant reciprocating motion of diaphragm pump operation, helping maintain clamp load between service intervals.
- Critical Fastener — Correct Specification Matters — In pump assemblies, using an incorrect fastener grade or thread form can result in fastener failure, fluid leaks, or structural damage to the pump housing; always replace with the OEM-specified part number 5000051317.
A lock nut is a fastener engineered to resist loosening when subjected to vibration, torque fluctuation, or dynamic loading — all conditions present during normal diaphragm pump operation. In a diaphragm trash pump, lock nuts are used to secure key structural and mechanical connections that must maintain consistent clamp load throughout the pump's duty cycle. When a lock nut wears, strips, or backs off, the joint it secures can shift or separate, leading to misalignment, fluid leakage, or accelerated wear on surrounding components. Replacing a failed or suspect lock nut promptly with the correct OEM part keeps the pump assembly tight and operating as intended.
Part Details
| Part Number | 5000051317 |
|---|---|
| Old Part Number | 0051317 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 75mm/3in Diaphragm Trash Pump | PDT3A | 5000007614, 5000007615, 5000007616 |
| 75mm/3in Inline Diaphragm Tras h Pump | PDI3A | 5000007628, 5000007629, 5000009407 |
| 75mm/3in Diaphragm Trash Pumps | PDT3 | 5000009495, 5000007619 |
| 75mm/3in Diaphragm Pump | PD3B | 5000006802 |
| 75mm/3in Diaphragm Trash Pump | PDI3 | 5000009491, 5000009492 |
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.
