Graco 17H865 Pump Cylinder

Genuine OEM Graco Part – ensures perfect fit and long-lasting durability.
Designed for UltraMax II 695, UltraMax II 795, and GMax II 3900 ProContractor sprayers.
Restores pump performance and maintains consistent spray pressure.
Precision-engineered cylinder for professional reliability and smooth operation.

Retail Price: $530

You save: $142.04 (26.80%)

Our Price: $387.96

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Description

Graco 17H865 Pump Cylinder — Overview, Compatibility & Specs

Compatible Machines

Graco UltraMax II 695
Graco UltraMax II 795
Graco GMax II 3900 ProContractor

What is the Graco 17H865 Pump Cylinder?

The 17H865 Pump Cylinder is the OEM fluid-section cylinder sleeve used in select Graco airless sprayers. It houses the piston assembly and maintains pressure and sealing during operation, ensuring smooth, consistent delivery of coatings. Replacing a worn cylinder helps restore performance, reduce pulsation, and extend overall pump life.

Key Benefits

OEM Quality: Genuine Graco part for reliable fit and performance.
Pressure Integrity: Restores proper sealing surface for stable spraying.
Longer Service Life: Minimizes wear on piston & packings when cylinder surface is renewed.
Consistent Finish: Helps maintain uniform atomization and flow.

Technical Details

Part Number	17H865
Part Type	Pump Cylinder (Fluid Section Cylinder Sleeve)
Brand / Status	Graco — OEM replacement part
Compatible Units	UltraMax II 695 UltraMax II 795 GMax II 3900 ProContractor
Typical Symptoms When Needed	Loss of pressure, visible scoring/wear, increased pulsation, frequent packing failures.
Included	Pump cylinder only (transfer/fit with existing compatible pump assembly components).

Fitment Notes

Designed to fit the fluid section used on UltraMax II 695, UltraMax II 795, and GMax II 3900 ProContractor.
Verify your sprayer’s model and pump series before ordering to ensure proper fit.
For best results, inspect and replace packings, piston/rod, and check valves if wear is present.

Installation & Care Tips

Depressurize and flush sprayer per Graco safety procedures before disassembly.
Lubricate packings and inspect piston/rod for scoring; replace worn parts together with the cylinder.
Torque fasteners to spec and test for leaks at low pressure before returning to service.
Use proper filtration and flush after use to prolong cylinder and packing life.

Frequently Asked Questions

It provides the precision sealing surface the piston runs in, creating spray pressure and stable flow in the fluid section of the pump.

Match the sprayer model and pump series to the compatibility list: UltraMax II 695, UltraMax II 795, and GMax II 3900 ProContractor. If your unit uses the same fluid section, this cylinder will fit.

It’s recommended to inspect/replace packings, piston/rod, and checks together if wear is present for best sealing and longevity.

Basic hand tools typically suffice. Always depressurize, follow Graco service procedures, and torque to spec.