Graco 15G234 Piston Wiper

The Graco 15G234 Piston Wiper ensures smooth piston movement and prevents leakage in 4 GPM airless pumps, extending system life and performance.

OEM Graco component – designed for precision fit
Reduces wear and maintains proper piston alignment
Compatible with GH-833 and 287834 pumps
Durable, solvent-resistant polymer construction

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Description

Compatible Machines for the 15G234 Piston Wiper

Graco GH-833 Displacement Pump
Graco 287834 Pump (4 GPM flow band)
Graco ProContractor Series – 4 GPM models

Product Overview

The 15G234 Piston Wiper is a high-precision sealing and guiding component designed for the piston valve assembly of 4 GPM airless spray pumps. It ensures that the piston remains properly aligned, reduces wear on sealing surfaces, and preserves optimal fluid control under high pressure.

Key Features

Part Number	15G234
Function	Piston wiper and guide for piston valve assembly in airless pump systems
Flow Band	4 GPM rating
Construction	Durable engineered polymer or elastomer seal with precision fit features

Materials & Performance

Manufactured with a robust polymer blend or elastomeric material, the 15G234 piston wiper is engineered to handle high-cycle operations, abrasive coatings and solvent exposure often found in commercial spray applications. It provides low-friction guidance for the piston and helps maintain sealing integrity between the piston and cylinder wall.

Installation & Maintenance

Before installation, ensure the piston and cylinder are clean and free of debris or dried coating material.
Lubricate lightly as per system manufacturer’s recommendations to ease assembly and prevent initial wear.
Inspect the wiper surface for scoring, abrasion, cracks or deformation during each maintenance cycle.
Replace this component if you notice excess piston side play, fluid bypassing the piston or unexpected pump rod vibration.

Applications

The 15G234 piston wiper is ideal for professional-grade airless coating equipment used in industrial manufacturing, automotive finishing, large-scale construction projects and abrasive or high-volume spray environments. It extends piston life, maintains consistent fluid delivery and helps ensure reliable system performance.

Frequently Asked Questions

The piston wiper ensures that the piston remains properly aligned and that debris or coating residue is prevented from damaging the piston-cylinder interface. This helps maintain consistent fluid output and reduces wear.

While aftermarket options may exist, the 15G234 is designed specifically for systems in the 4 GPM flow band and matches the precision requirements of the original equipment. Substituting may affect fit, sealing and longevity.

Replacement schedules vary based on usage, fluid type and maintenance conditions. Inspect during major service intervals and replace if you observe wear, fluid leakage past the piston or increased vibration in the pump system.