Graco 101274 Pin Cotter

Graco 101274 – Pin, Cotter (Genuine OEM)

Compatible Machines

• Graco displacement pumps that use the older-style displacement rod & piston ball stop assembly.
• Equipment listing 101274 (or 101-274) in the service/parts manual bill of materials.
• Pumps specifying a 0.12" (≈3.2 mm) × 0.50" (≈13 mm) cotter pin at the rod/ball-stop location.
• Commonly found across select airless paint sprayers and fluid-handling pumps that reference this pin in their exploded views.

What is the Graco 101274 Pin, Cotter?

A genuine cotter pin used to secure critical internal components—typically the piston ball stop to the displacement rod—inside compatible Graco pumps. Using OEM hardware preserves fit, tolerance, and long-term reliability under high-pressure operation.

Key Features

• OEM dimensions for proper retention in Graco pump assemblies.
• Steel construction for durability in high-cycle environments.
• Small but critical: prevents displacement-rod components from backing out.

Specifications

Fitment Notes

• Always verify by manual: look for 101274 / 101-274 in your sprayer’s parts list or exploded diagram.
• If your pump calls for a 0.12" × 0.50" cotter pin at the ball-stop location, this is the correct OEM piece.
• Replace if bent, corroded, fatigued, or removed during pump overhaul.

Installation Tips (General)

1. Depressurize and follow all lock-out/tag-out and safety guidance in the machine manual.
2. Confirm orientation and fully seat the pin through the rod/ball-stop holes.
3. Spread the legs of the cotter pin evenly to lock components in place without deforming adjoining parts.
4. After reassembly, perform a leak and function check at low pressure before returning to service.

Frequently Asked Questions