Wacker Neuson 5000051676 Lock Nut

The Wacker Neuson Lock Nut is a genuine OEM fastener designed for PT6LT series trash pumps and a broad range of LT, LTP, LTW, and LTWP light towers. Sourced directly from Wacker Neuson, this lock nut meets the exact specifications of the original hardware installed at the factory. It fits multiple configurations across the PT6LT pump lineup — including the PT6LT Pump with Trailer and PT6LT(I) Trash Pump — as well as LTC4L, LT4K, LT4Z, LT4SK, LT4SZ, LTW4Z, LTW4K, LTW6Z, and their LTP and LTWP variants. When replacing worn or damaged fasteners, using the correct OEM part ensures proper clamping load and thread engagement are restored without compromise.

Key Features

• Genuine OEM Thread Integrity — Manufactured to Wacker Neuson's original thread pitch and hardness spec, ensuring the locking mechanism engages and holds as designed under operational vibration.
• Direct Drop-In Installation — Matches the original fastener's dimensions and thread form exactly, so it installs in place of the existing hardware without reworking or chasing threads.
• Broad Fitment Across Two Machine Families — Confirmed for PT6LT trash pumps (including T4 and Indirect variants) and a wide range of LT, LTP, LTW, and LTWP light towers across 4K, 4Z, 4SK, 4SZ, and 6Z configurations.
• Vibration-Resistant Locking Action — A lock nut's prevailing-torque design prevents self-loosening under the continuous vibration loads inherent to pump and light tower operation, protecting surrounding components from movement and wear.
• Fastener-Critical Safety Application — On pumps and light towers, loose or failed fasteners can allow structural and mechanical assemblies to shift under load; replacing with a verified OEM lock nut maintains the clamping integrity these machines depend on.

A lock nut is a self-retaining fastener engineered to resist loosening when exposed to vibration, shock loads, and thermal cycling — conditions that standard nuts can fail to handle over time. On trash pumps like the PT6LT, lock nuts secure components against the continuous vibration of high-volume fluid transfer operation. On light towers, they maintain the integrity of structural and mechanical connections that must remain stable through transport, setup, and extended run cycles. When a lock nut strips, seizes, or loses its locking torque, it can allow connected components to shift or separate, leading to accelerated wear or mechanical failure elsewhere in the assembly.

Part Details

Compatibility & Fitment

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.