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Graco 118591 Washer Back-Up

The Graco 118591 Washer Back-Up ensures reliable pump operation by supporting O-ring seals and reducing wear.

  • Protects O-ring seals in high-pressure pumps
  • Corrosion-resistant stainless steel with low-friction coating
  • Extends pump life and reduces maintenance
  • Compatible with latex, epoxy, and solvent-based coatings

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Graco 118591 Washer Back-Up: Precision Seal Support

Compatible Machines

  • Graco Mark V Electric Airless Sprayer
  • Graco Mark X Gas Airless Sprayer
  • Graco ProMix 2KS Sprayer
  • Graco XM 5500 Industrial Sprayer
  • Graco GH 833 High-Pressure Sprayer

Key Features

  • Precision-milled to ±0.005 mm for consistent fit
  • Corrosion-resistant alloys with fluoropolymer inner layer
  • Supports O-ring seals in high-pressure pumps up to 3000 psi
  • Reduces friction and wear for longer pump life
  • Compatible with diverse coating materials including latex and epoxy

Description

The Graco 118591 Washer Back-Up is engineered to protect O-ring seals and ensure consistent pump performance in high-pressure airless sprayers. Its robust construction minimizes wear, prevents seal extrusion, and maintains fluid integrity, making it ideal for professional coating applications.

Installation & Maintenance

  • Press-fit installation with calibrated tolerance ring or piloted adapter
  • Apply low-friction, high-temperature grease to washer and O-ring surfaces
  • Inspect every 5000 operating hours or 6000 cycles
  • Replacement ensures uninterrupted operation and extended maintenance intervals

Frequently Asked Questions

It supports O-ring seals in high-pressure pumps, preventing extrusion and reducing wear for reliable pump operation.

Compatible with a wide range of coatings including latex, epoxy, and solventborne materials.

Recommended inspection is every 5000 operating hours or 6000 cycles, with replacement as a preventative measure for uninterrupted service.

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