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Graco 100579 Pin Cotter

Graco 100579 Pin Cotter is a genuine retaining pin used in various Graco pump and agitator assemblies to keep components securely fastened.

  • Size: 7/64" × 1" (≈ 2.8 mm × 25 mm)
  • Used in Graco Air-Driven Agitators & President Pumps
  • Durable steel for long-term reliability
  • Essential for maintaining secure mechanical connections

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Graco 100579 — Pin Cotter (Specs, Fitment & FAQs)

Compatible Machines / Assemblies

The Graco 100579 Pin, Cotter is used across multiple Graco pump and agitator assemblies. Always confirm with your machine’s parts diagram before ordering.

  • Graco Air-Driven Agitators — various models per official parts lists (qty commonly 2).
  • President Series Pumps — e.g., Stubby Size 4:1 Ratio President Pump (listed as 100-579 in the bill of materials).

Key Specifications

Graco Part # 100579
Description PIN, COTTER (retaining cotter pin for pump/agitator linkages)
Nominal Size Ø ≈ 0.11" (≈ 2.8 mm) × 1" (25 mm) length
Typical Usage Secures mechanical linkages/collars within agitators and pump assemblies
Typical Quantity Varies by assembly (often 1–2; verify in your manual)
Fitment Guidance Match by exact part number (100579) in the official parts list for your machine/assembly

What It Does & Why It Matters

  • Prevents loosening of couplings/linkages during operation.
  • Maintains alignment of moving parts in pumps and agitators to reduce wear.
  • Genuine-spec size ensures drop-in replacement when 100579 is called out in the manual.

Install & Care Notes

  • Insert through the specified hole and properly spread legs to lock in place.
  • Do not substitute undersized/oversized pins; fit and retention can be compromised.
  • Inspect during maintenance for bending, fatigue, or corrosion; replace if deformed.

Frequently Asked Questions

Official Graco parts lists call out approximately 0.11" (2.8 mm) diameter × 1" (25 mm) length for 100579. Always verify in your model’s parts list before ordering.

It’s used across Graco Air-Driven Agitators and President series pump assemblies (among others). Because it’s a small retention part, fitment is assembly-specific—confirm your manual lists 100579.

The quantity varies by model and location (commonly 1–2). Your machine’s parts diagram specifies the exact count and placement.

Use only the specified size and quality. Off-spec pins risk looseness or premature wear. A genuine/like-for-like replacement is recommended where 100579 is specified.

Open your unit’s official Graco manual/parts list and search for part 100579. If it appears in the bill of materials for your assembly, you’re good to go.

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