Wacker Neuson 5100064366 Square Key 1/4x1/4

The Wacker Neuson Square Key 1/4x1/4 is a genuine OEM component designed for PT3A series trash pumps. Sourced directly from Wacker Neuson, this part meets the exact specifications required for correct shaft-to-drive engagement on your pump. As a genuine OEM part, delivers the dimensional accuracy and material grade needed to maintain proper power transmission between mating components. Verified for compatibility with PT3A models, this is the correct replacement when your square key shows signs of wear, shearing, or deformation.

Key Features

• OEM Dimensional Accuracy — Manufactured to Wacker Neuson's exact tolerances, ensuring the key seats flush in both shaft and hub keyways without play or slop.
• Direct Drop-In Replacement — Slots directly into the existing keyway groove, requiring no filing, shimming, or recutting of mating surfaces.
• PT3A Series Fitment — Confirmed fit for PT3A trash pump models, so you can order with confidence knowing this is the right part for your machine.
• Positive Power Transmission — A correctly fitted square key locks the impeller or drive component firmly to the shaft, preventing slippage that robs pump output and accelerates wear on both mating parts.
• Genuine Wacker Neuson Part — Backed by Wacker Neuson's OEM supply chain, this key is produced from material stock that meets the shear-strength demands of pump drive applications.

A square key is a small but critical drivetrain component that sits in a machined slot — called a keyway — cut into both a rotating shaft and the hub of a mating part such as an impeller or pulley. Its job is to lock those two components together so torque transfers cleanly from one to the other without rotational slippage. When a square key wears down, deforms, or shears completely, the driven component spins independently of the shaft, causing an immediate loss of pump function and potential damage to the keyways themselves if operation continues.

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.