Graco 16X455 Pump Cylinder
$504.72
$701.00
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Graco 16X455 Pump Cylinder, a genuine OEM fluid-section component designed for the Graco GMAX II 7900 (Lo-Boy).
- Ensures smooth piston travel and consistent atomization.
- Precision-machined for high-pressure airless applications.
- Maintains like-new sprayer performance and seal integrity.
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Graco 16X455 Pump Cylinder — Overview, Fitment & Specs
Compatible Machines
- Graco GMAX II 7900 (Lo-Boy)
Fitment note: For most Hi-Boy packages of the GMAX II 7900, Graco typically uses cylinder 16X454 instead of 16X455.
What is the Graco 16X455 Pump Cylinder?
The 16X455 Pump Cylinder is the main fluid-end sleeve used in select Graco airless sprayers. The piston travels inside this hardened cylinder to generate the pressure needed for high-volume, professional coating applications. It is designed for durability, smooth sealing, and consistent output on the GMAX II 7900 Lo-Boy.
- Genuine Graco replacement for long service life and proper sealing.
- Maintains optimal pressure and flow for heavy coatings.
- Engineered to match OEM tolerances in the fluid section.
Key Specifications
| Attribute | Detail |
|---|---|
| Part Number | 16X455 |
| Component | Pump Cylinder (fluid section sleeve) |
| Primary Compatibility | Graco GMAX II 7900 (Lo-Boy) |
| Typical Application | High-output airless spraying of paints, primers & heavy coatings |
| Alternate/Related | Hi-Boy versions typically use 16X454 (verify your model) |
Fitment & Installation Notes
- Confirm your sprayer configuration (Lo-Boy vs Hi-Boy) from the nameplate or manual.
- Depressurize, flush, and disassemble the fluid section per the Graco service guide.
- Inspect piston, packings, and seals; replace worn items when installing a new cylinder.
- Torque to OEM spec and perform a pressure/leak test before returning to service.
Frequently Asked Questions
The 16X455 is used on the Graco GMAX II 7900 (Lo-Boy). If your unit is a Hi-Boy, it typically takes cylinder 16X454—check your parts list to confirm.
The chassis height/cart style and model label indicate this. Lo-Boy units sit lower with a different cart frame. The model tag and manual will list the configuration explicitly.
It’s recommended to inspect and replace packings, seals, and the piston if worn. Fresh packings help maintain pressure, reduce bypass, and extend service life.
No. These cylinders are matched to specific cart configurations. 16X455 is intended for Lo-Boy, while 16X454 is typically for Hi-Boy. Always verify against your exact model and serial.
Pro Tips for Best Performance
- Flush with compatible solvent before/after service to remove debris.
- Use OEM-grade lubricants on packings during assembly.
- Record pressure test results after reassembly for future reference.
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