Graco 17H866 Pump Cylinder

Part Number: 17H866
Component: Genuine Graco OEM Pump Cylinder
Compatible Machines: UltraMax II 1095, UltraMax II 1595, GMax II 5900 (ProContractor Series)
Purpose: Direct-fit replacement ensuring consistent pressure, durability, and smooth spray performance
Benefit: Maintains factory-grade reliability and peak efficiency for professional sprayers

List Price: $718

You save: $201.04 (28.00%)

Sale Price: $516.96

Based on 0 reviews

Description

Graco 17H866 Pump Cylinder

Compatible Machines

UltraMax II 1095 (ProContractor Series)
UltraMax II 1595 (ProContractor Series)
GMax II 5900 (ProContractor Series)

What is the Graco 17H866 Pump Cylinder?

Graco 17H866 Pump Cylinder is the OEM fluid-cylinder body used in select Graco airless sprayers listed above. It forms the main pressure chamber of the pump’s fluid section housing the piston/packings and maintaining a precise, wear-resistant bore to deliver consistent spray performance. Choosing an OEM cylinder helps preserve prime, pressure stability, and service life.

Key Details

Part Number	17H866
Brand	Graco
Component	Pump Cylinder (fluid section cylinder body)
Compatibility	UltraMax II 1095, UltraMax II 1595, GMax II 5900 (ProContractor Series)
What’s Included	1 × Pump Cylinder (no additional seals or rods unless specified by kit)
Use Case	Restores pump performance when the original cylinder is worn, scored, or out of tolerance

Fitment & Installation Notes

Verify model badge and series before ordering (e.g., UltraMax II 1095/1595 ProContractor or GMax II 5900 ProContractor).
Inspect piston rod and packings; pair the new Pump Cylinder with fresh packings if wear is present.
Follow Graco torque specs and lubrication guidelines during reassembly to maintain concentricity and seal life.
After install, pressure-test at water before coating to confirm prime and check for leaks.

Frequently Asked Questions

It’s listed for UltraMax II 1095, UltraMax II 1595, and GMax II 5900 in the ProContractor range. Check your exact model/series; Standard or IronMan variants may require different part numbers.

Inspect piston/packings, seals, and check-valve components. If there’s scoring or poor prime/pressure, pair the cylinder with the correct packing kit and refresh check balls/seats as needed.

Yes—Graco OEM. Using OEM maintains correct tolerances, finish, and durability for the specified sprayers.

Match your sprayer’s exact model and series (label on frame or pump). If unsure, share your unit’s model and serial with support to confirm that 17H866 is correct.

Need help choosing between cylinders or kits? Send your sprayer model/series and we will verify if 17H866 is the right match.