Graco 249177 Piston Valve Repair Q Kit

Graco 249177 Piston Valve Repair “Q” Kit restores performance to large Graco airless sprayers by renewing the piston valve section. Perfect for fixing loss of pressure or spray pulsation.

Fits GH 200 / GH 230 / GH 300
Fits GMAX II 7900 (Standard, ProContractor, IronMan)
Compatible with Mark X and Ultra Max II 1895
OEM-grade components for reliable sealing

Retail Price: $141

You save: $11.7 (8.30%)

Our Price: $129.3

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Description

Graco 249177 – Piston Valve Repair “Q” Kit: Overview & Compatibility

Compatible Machines

This Graco 249177 kit fits the following sprayers/pumps:

GH 200 (multiple model variants)
GH 230 (multiple model variants)
GH 300 (multiple model variants)
GMAX II 7900 – Standard / Lo-Boy (16W884), ProContractor (16W885), IronMan (16W887) and related 79xx assemblies
Mark X series (selected models)
Ultra Max II 1895 (selected models)

What is it?

The Graco 249177 Piston Valve Repair “Q” Kit is a factory repair set for the piston-valve section of heavy-duty Graco airless pumps. It restores proper sealing, check-valve function and pressure consistency without replacing the entire pump.

OEM description: KIT, REPAIR, VALVE, PISTON
Use when you have loss of pressure, hard priming, pulsing, or material blow-by past the piston valve.

Key Benefits

Restores performance of the piston-valve check system
Reduces downtime versus full pump replacement
OEM fit & materials for long service life

What’s included

Contents vary by production run; typical items include:

Piston-valve components (valve body/seat, plate)
Springs and hardware
Seals and O-rings for the valve section

Quick Specs

Part Number	249177
OEM Description	KIT, REPAIR, VALVE, PISTON
Section Serviced	Piston / Lower Pump Check Valve
Typical Series	GH 200, GH 230, GH 300, GMAX II 7900, Mark X, Ultra Max II 1895
When to Use	Pressure drop, difficult priming, leakage past piston, incomplete check-valve sealing

Fitment Notes

Verify by exact model and pump lower assembly in your parts manual.
If the lower shows heavy wear (rod/cylinder scoring), consider a complete lower repair or pump kit.
Flush and inspect mating surfaces before reassembly; torque fasteners to spec.

Frequently Asked Questions

Question	Answer
Will 249177 fit my smaller Ultra Max II (e.g., 695/795)?	Generally no. The 249177 kit is used on larger frames like GH 200/230/300, GMAX II 7900, Mark X, and some Ultra Max II 1895 models. Check your manual’s valve-piston kit callout.
What symptoms point to a bad piston valve?	Loss of pressure, pulsing spray, slow/failed priming, or material bypass past the valve seat.
Do I need special tools?	Basic hand tools and a torque wrench are recommended. Follow Graco service procedures for your pump lower.
Should I replace packings at the same time?	It’s smart to inspect packings/rod and replace if worn to avoid repeat teardown.
How do I confirm compatibility?	Match your sprayer’s model/series and pump lower to the parts manual; if it lists 249177 for the piston-valve repair, you’re good to go.