Wacker Neuson 5000051321 Gearcase

The Wacker Neuson Gearcase is a genuine OEM component designed for the PD3B 75mm/3in Diaphragm Pump. As a direct factory replacement, this gearcase is produced to the same specifications as the original unit, ensuring proper fit and function within the drive assembly. If your PD3B is exhibiting irregular diaphragm stroke, excessive vibration, or loss of pumping output, the gearcase is a critical component to inspect and replace. Verify your model number against the PD3B fitment before ordering to confirm compatibility.

Key Features

• Genuine OEM Construction — Manufactured by Wacker Neuson to original tolerances, ensuring the gear mesh and housing dimensions match the drive assembly exactly as designed.
• Direct Drop-In Replacement — Replaces the original gearcase on the PD3B, aligning with existing mounting points and drive shaft interfaces for a straightforward installation.
• PD3B Fitment Confirmed — Specifically sourced for the PD3B 75mm/3in Diaphragm Pump series; always verify your machine number before ordering.
• Restores Full Drive Output — A worn or damaged gearcase disrupts the eccentric drive mechanism that powers the diaphragm stroke, leading to reduced flow rate or complete pump failure. Replacing it brings output back to rated capacity.
• Protects Downstream Components — A failed gearcase can place undue stress on the diaphragm and connecting rod; restoring the gearcase prevents cascading wear through the pump drive train.

The gearcase on a diaphragm pump houses the gear-driven eccentric mechanism that converts rotational engine power into the reciprocating stroke needed to move the diaphragm. This back-and-forth motion is what draws fluid into the pump chamber and forces it out through the discharge port. When the gearcase wears or sustains damage — through lubrication loss, impact, or extended service — the eccentric drive becomes erratic, reducing pumping efficiency and ultimately causing diaphragm or connecting rod failure if left unaddressed.

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.