Precision Rebuild for Graco Airless Pumps – 287551 Kit
Compatible Machines
- Graco GMax II 3900
- Graco RentalPro 360G
What is the Graco 287551 Pump Cylinder Repair Kit?
The Graco 287551 Pump Cylinder Repair Kit (also listed as Cylinder Repair Q Kit) is a genuine Graco service kit designed to restore the cylinder sealing surfaces and related wear components in select Graco airless pumps. Rebuilding with OEM parts helps recover prime/pressure, reduce leaks, and extend pump life.
At-a-Glance Specs
| OEM Part | 287551 |
| Kit Type | Pump Cylinder Repair Kit (OEM) |
| Fits | GMax II 3900, RentalPro 360G (verify series) |
| Purpose | Restore cylinder sealing/efficiency; address pressure loss and leakage due to wear |
| Contents | OEM cylinder-related components (contents may vary by production; confirm in manual) |
Key Benefits
- Restores consistent pressure and spray pattern
- Reduces leakage and premature wear
- Maintains OEM performance and reliability
- Supports longer service intervals when used with proper cleaning/filtration
Installation & Service Notes
- Follow the model-specific Graco service manual; perform full pressure relief before disassembly
- Inspect cylinder bore/rod for nicks or scoring; replace damaged hard parts
- Clean all parts thoroughly; assemble with recommended lubricants
- Prime and test at low pressure; check for leaks and proper operation before full duty
Also Known As
May be listed as: Kit, Repair, Cylinder or Cylinder Repair Q Kit.
Frequently Asked Questions
Match your sprayer’s exact model/series and serial number in the Graco parts manual. If your unit has been upgraded with a different pump, verify by current pump assembly part number as well.
Difficult priming, loss of pressure, pulsation, visible fluid bypass, or frequent packings wear can indicate cylinder wear. Inspect components before reuse.
No. It targets cylinder-related service items. Some pumps may require additional parts (e.g., ball checks, rods, packings) depending on inspection. Refer to your model’s BOM.
Yes—if you’re familiar with Graco service procedures and safety. Otherwise, use an authorized service center. Improper assembly can cause damage or injury.
Use correct filtration and tip size, flush promptly after use, store with pump conditioner if recommended, and follow the maintenance intervals in your manual.
