Graco 17A578 Repair Packing Kit (Ceramic Ball)

Graco 17A578 Repair Packing Kit (Ceramic Ball) — OEM seal kit with leather/PE packings and a ceramic check ball.
Fits: GMax II 7900 (Standard/ProContractor/IronMan) and TexSpray Mark X; pumps 16X425, 16X427, 17H831, 17H837.
Purpose: Restores prime/pressure, stops bypass leaks, improves spray consistency.
Includes: Upper & lower packings, seals, O-rings, and a ceramic ball.

List Price: $196

You save: $61.25 (31.25%)

Sale Price: $134.75

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Description

Graco 17A578 Repair Packing Kit (Ceramic Ball)

Compatible Machines

Graco GMax II 7900 (Standard / ProContractor / IronMan; Lo-Boy & Hi-Boy frames)
Graco TexSpray Mark X (Standard)
Compatible Graco pump assemblies: 16X425, 16X427, 17H831, 17H837

Product Overview

Graco 17A578 Repair Packing Kit is a complete pump seal kit for select high-output airless sprayers. It includes upper/lower packings, seals, and a ceramic ball check element engineered for superior wear resistance in demanding coatings. Replacing worn packings restores prime, pressure, and spray quality.

Key Specifications

Part Number	17A578
Kit Type	Pump Repair / Packing Kit (upper & lower)
Check Ball Material	Ceramic (high wear resistance)
Packing Materials	Leather & Polyethylene blend
Compatible Pumps	GMax II 7900 & TexSpray Mark X fluid sections; pumps 16X425, 16X427, 17H831, 17H837
Typical Use	Restore sealing, prime retention, and spraying performance; reduce bypass/leaks
Includes	Upper & lower packings, ceramic ball, seals, O-rings, and related small parts

Why Choose This Kit

Durability: Ceramic ball resists abrasion in heavy-bodied or filled coatings.
Seal Integrity: Leather/PE packings balance solvent tolerance, lubrication, and longevity.
OEM Fit: Sized for the listed Graco pumps & sprayer models.
Performance: Restores prime, pressure stability, and uniform spray pattern.

Installation Tips

Depressurize and flush sprayer per Graco safety procedure.
Remove fluid section and disassemble per model service manual.
Inspect rod & cylinder; replace if pitted or scored to prevent premature seal wear.
Lightly oil leather packings during assembly; observe correct orientation of each packing.
Torque components to spec; test for leaks and proper prime/pressure.

Tip: A worn piston rod can shorten packing life. Replace rod if surface damage is visible.

Frequently Asked Questions

Upper & lower packings, seals, O-rings, and a ceramic ball check element—everything needed to reseal the listed pump assemblies.

Verify your model is a GMax II 7900 (any trim) or TexSpray Mark X, or your pump is one of: 16X425, 16X427, 17H831, 17H837. If unsure, check the pump tag or manual.

Ceramic offers excellent hardness and wear resistance, improving check-valve life when spraying abrasive or high-solids materials.

Replace when you notice pressure fluctuation, loss of prime, fluid bypass, or leakage at the packings. Heavy use or abrasive coatings will shorten service intervals.