SprayTech part 0551678 is a replacement piston assembly designed to restore proper pumping function on compatible sprayers. This assembly is a critical component of the fluid section, responsible for creating the pressure needed to atomize coating materials. Installing a new piston assembly helps restore consistent pressure output and reliable spray performance.
| Part Number | 0551678 |
|---|---|
| Part Description | Piston Assembly |
| Brand | SprayTech |
| Fits | SprayTech Airless EPX2355; SprayTech Airless Advantage EPX2355 |
| Condition | New |
The SprayTech 0551678 piston assembly is a precision-engineered replacement component manufactured to original equipment specifications for use with SprayTech Airless EPX2355 and SprayTech Airless Advantage EPX2355 sprayers. This assembly serves as the heart of the fluid section, converting mechanical motion into hydraulic pressure that propels coating material through the hose and spray tip. The piston moves within the cylinder bore, creating the suction and compression cycles necessary for consistent material delivery. Over time, normal wear from friction, abrasive materials, and chemical exposure can degrade the piston surface, leading to reduced pressure output, erratic spray patterns, or complete loss of pumping function. Symptoms of a worn piston assembly include difficulty building or maintaining pressure, surging during operation, or the sprayer running continuously without building proper pressure. Replacing the piston assembly restores the tight clearances required for efficient pumping, helping to return the sprayer to its intended performance level. This assembly is manufactured to match original tolerances, ensuring proper fit within the fluid section and compatibility with associated seals and packings.
| Pressure generation | Creates hydraulic pressure for material atomization |
|---|---|
| Fluid displacement | Moves coating material through the pumping system |
| Flow consistency | Maintains steady output during operation |
| Low pressure output | Sprayer fails to reach or maintain operating pressure |
|---|---|
| Pressure surging | Fluctuating pressure during operation |
| Continuous running | Sprayer runs without building pressure |
| Visible wear | Scoring, pitting, or damage on piston surface |
SprayTech part 0551678 is compatible with the following sprayers. Confirm fitment using the parts diagram for your specific model.
| Model | Component |
|---|---|
| SprayTech Airless EPX2355 | Piston Assembly |
| SprayTech Airless Advantage EPX2355 | Piston Assembly |
When servicing the piston assembly, these related components are often replaced or inspected at the same time to ensure complete fluid section restoration.
Seals wear alongside the piston and are critical for maintaining proper compression and preventing fluid bypass.
Inspect the cylinder bore for scoring or wear that may affect piston performance.
Valves control fluid direction and may require service if pressure issues persist.
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