Wacker Neuson 5200021079 Crankshaft Pulley

The Wacker Neuson Crankshaft Pulley is a genuine OEM component designed for G40 and G50 series portable generators. As a factory-sourced part, it matches the original specifications for pulley diameter, bore sizing, and belt groove profile — ensuring the drive system operates exactly as Wacker Neuson engineered it. Confirmed fitment spans multiple G40 configurations including standard, mobile, 50Hz LATAM, and Premium variants, as well as the G50 generator series. When your crankshaft pulley shows signs of wear, cracking, or belt misalignment, replacing it with part number restores proper power transfer and keeps your generator running at full output.

Key Features

• Genuine OEM Pulley Geometry — Manufactured to Wacker Neuson's exact groove profile and bore dimensions, so belt tracking and tension remain within spec from the first start-up.
• Direct-Fit Replacement — Mounts to the crankshaft using the same bolt pattern and taper fit as the original, requiring no shimming or adaptation during installation.
• Broad G40 and G50 Coverage — Verified for standard G40, mobile G40, G40 50Hz LATAM Premium, and G50 generator models — one part number covers the full range.
• Sustained Drive System Performance — A correctly sized pulley maintains proper alternator belt speed and tension; a worn or cracked pulley causes belt slip, premature belt failure, and loss of charging output.
• Fuel System Safety Compliance — As a rotating crankshaft component, dimensional accuracy directly affects vibration balance; using the correct OEM pulley reduces abnormal crankshaft load and protects the engine's front seal.

The crankshaft pulley sits at the front of the engine and is driven directly by the crankshaft. Its primary job is to transfer rotational power via a drive belt to the alternator — the component that actually generates electrical output. If the pulley is undersized, oversized, worn in its belt groove, or cracked, the drive belt will slip or run out of alignment, reducing alternator output or causing the belt to fail entirely. On a portable generator, where consistent voltage output is critical to connected equipment, a compromised crankshaft pulley can cause fluctuating power delivery or a complete loss of generation until the part is replaced.

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.