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Graco 100103 Pin Cotter

Graco 100103 Pin, Cotter is a genuine replacement fastener designed to secure rods, pistons, or linkage parts within Graco pump assemblies. Built for reliability and perfect OEM fit.

  • Part No: 100103 (1/8" × 1-1/2")
  • Used in: Senator, GH 733, Viscount II 4500, and President pump systems
  • Material: Durable steel construction
  • Ensures secure retention of moving components

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Overview: Graco 100103 – Pin, Cotter (1/8" × 1-1/2")

Compatible Machines / Assemblies

This cotter pin is used across multiple Graco pumps and connection kits that specify a 1/8" × 1-1/2" cotter pin.

  • Graco 13:1 Senator pump systems (assemblies calling out 100103 in parts list)
  • Graco GH 733 (gas hydraulic) systems where the lower/drive linkage specifies 100103
  • Graco Viscount II 4500 hydraulic systems (select 4-ball lower linkages)
  • Graco President air motor + 4-ball lower assemblies (per applicable parts manuals)
  • Graco 4-Ball Lower Retrofit Connection Kits (e.g., kit families that list 100103 “Pin, Cotter”)
  • Other Graco displacement pumps that explicitly specify a 1/8" × 1-1/2" cotter pin in the bill of materials

Key Specifications

Part Number 100103 (also written 100-103)
Item Pin, Cotter (retaining/locking pin)
Typical Size 1/8" diameter × 1-1/2" length (per common Graco parts lists)
Function Secures rods, linkages, locknuts or piston hardware within pump/connection assemblies
Material/Finish Steel (finish may vary by production lot)

Why Choose the Graco 100103 Cotter Pin

  • Correct spec for assemblies calling out 1/8" × 1-1/2"
  • Reliable retention of drive rods, pistons and linkage components
  • Genuine-fit sizing commonly used across Graco pump families
  • Low-cost safeguard against vibration-related loosening

How to Confirm Fit

  1. Identify your exact sprayer/pump model and series.
  2. Open the OEM parts list (BOM) for your model.
  3. Locate the linkage/rod/piston call-outs and verify the cotter pin size/part # is 100103 (1/8" × 1-1/2").
  4. If a different size/part # is listed, use the exact specified pin for that assembly.

Frequently Asked Questions

Common Graco parts lists show 1/8" diameter × 1-1/2" length. Verify this against your model’s BOM before ordering.

Frequently seen on Senator, GH 733, Viscount II 4500, and certain President + 4-ball lower assemblies, as well as select 4-Ball Lower Retrofit Connection Kits. Always confirm via the parts list for your exact model/series.

Replace if bent out of shape, corroded, fatigued, or if legs no longer hold securely after service. Always use the OEM-specified size to maintain retention strength.

Insert through the pre-drilled hole fully, then spread the legs evenly to lock the assembly. Do not over-bend; avoid reusing old cotter pins after disassembly.

No. Many Graco assemblies use 100103, but others may call for different lengths/diameters. Use your machine’s parts manual to confirm the exact pin required.

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