Wacker Neuson 5000077256 Cotter Pin 1/8 X 1-1/4

The Wacker Neuson is a genuine OEM Cotter Pin 1/8 X 1-1/4 designed for a broad range of Wacker Neuson walk-behind concrete trowels, portable generators, vibratory plates, and floor saws. Sourced directly from Wacker Neuson, this cotter pin matches the original factory component in material grade, diameter, and length, ensuring a correct fit without modification. Fitment covers the CT36 and CT48 walk-behind trowel families, GP and GPS portable generator series, WP and VP vibratory plate series, RS800 single-drum rollers, BFS floor saws, and select rammer models. Keeping a genuine OEM fastener in place means the retained component stays secured as designed — protecting both the assembly and the operator.

Key Features

• Genuine OEM Fastener Integrity — Manufactured to Wacker Neuson's original dimensional spec for the correct 1/8 in. diameter and 1-1/4 in. length, so the pin seats and spreads as intended without distortion or premature failure.
• Direct Drop-In Replacement — Matches the original hole clearance and leg geometry of the retained assembly, allowing straightforward installation with standard cotter pin tools.
• Wide Cross-Equipment Fitment — Compatible with CT36 and CT48 walk-behind trowel series, GP/GPS portable generator series, WP/VP vibratory plate series, RS800 single-drum rollers, BFS floor saws, and select BS rammer models.
• Retention Function Under Load — A cotter pin is a critical retention fastener; a worn, bent, or missing pin allows clevis pins, shaft pins, and linkage bolts to back out under vibration, leading to unexpected component separation.
• Safety-Critical Fastener — Where cotter pins secure control linkages, axle pins, or load-bearing pivot points, using an undersized or incorrect-material substitute creates a risk of sudden disengagement; the OEM part maintains the designed retention load.

A cotter pin is a split-leg metal fastener that passes through a drilled hole in a pin or bolt and is then bent outward to lock the assembly in place, preventing the primary fastener from working loose under vibration or cyclic loading. On equipment like concrete trowels, generators, and compactors — all of which produce continuous vibration during operation — this small fastener plays an outsized role in keeping shafts, linkages, and clevis pins securely seated. When a cotter pin fails, bends flat, or goes missing, the component it retains can shift or separate, causing rapid wear of adjoining parts or an unsafe loss of mechanical control.

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.

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