Titan 0551678 Piston Assembly
OEM Titan Pump Component
Titan 0551678 Piston Assembly is an OEM replacement piston assembly for the fluid section of compatible SprayTECH and Titan airless sprayers. This assembly is the heart of the pump, converting mechanical motion into hydraulic pressure to propel coating material through the system.
Compatibility Overview
Replacing a worn piston assembly restores proper pressure generation, eliminates surging, and maintains consistent material delivery for reliable spray performance.
Titan Pump Component Replacement
Titan 0551678 Piston Assembly for EPX2355 Fluid Section
Titan 0551678 is an OEM piston assembly designed for the fluid section of compatible SprayTECH and Titan airless sprayers. This assembly is the heart of the pump, 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. It is listed in the official EPX2355 Fluid Section Assembly (P/N 0551675) parts diagram as item 28, including items 8 through 14.
| Detail | Technical / Commercial Information |
|---|---|
| Product Overview | OEM Titan/SprayTECH 0551678 piston assembly. Listed in the official EPX2355 Fluid Section Assembly (P/N 0551675) parts diagram as item 28, quantity 1, including items 8 through 14. Precision-engineered replacement component manufactured to original equipment specifications. |
| Function | Generates hydraulic pressure for material atomization. Displaces fluid through the pumping system. Maintains steady output during operation. Creates the suction and compression cycles necessary for consistent material delivery. |
| Compatible Models | SprayTech Airless EPX2355, SprayTech Airless Advantage EPX2355. Also referenced for Wagner SprayTech EPX2355 and Sherwin Williams SW726 (EPX-style). Verify fitment against your specific model parts diagram before ordering. |
| Common Failure Symptoms | Low pressure output where the sprayer fails to reach or maintain operating pressure. Pressure surging or fluctuating during operation. Sprayer runs continuously without building pressure. Visible scoring, pitting, or damage on the piston surface. Difficulty building or maintaining pressure. |
| Service Guidance | When replacing the piston assembly, inspect the cylinder bore for scoring or damage. Replace packings and seals simultaneously to ensure proper sealing and maximize service life. The piston and seals work together as a system, and worn seals will prevent a new piston from achieving proper performance. |
| Related Parts Serviced Together | Piston packings and seals (upper and lower), cylinder or cylinder liner (inspect for scoring or wear), inlet and outlet valves, and fluid section housing (0551681). Consider a complete fluid section rebuild for comprehensive service. |
| OEM & Brand Information | Genuine Titan/SprayTECH component manufactured to original tolerances for proper fit within the fluid section and compatibility with associated seals and packings. |
| Commercial Benefits | Restores tight clearances required for efficient pumping, returns the sprayer to its intended performance level, reduces downtime from pressure-related failures, and extends the service life of the fluid section. |
The 0551678 Piston Assembly is a critical replacement for contractors and service technicians maintaining compatible SprayTECH and Titan sprayers. If the sprayer fails to build pressure, surges during operation, or runs continuously without building proper pressure, the piston assembly may be worn. Over time, normal wear from friction, abrasive materials, and chemical exposure can degrade the piston surface, leading to reduced pressure output and erratic spray patterns. When replacing the piston, inspect the cylinder bore for scoring, replace packings and seals simultaneously, and check the inlet and outlet valves. Replacing a worn piston assembly promptly restores efficient pumping and reliable spray performance.
Frequently Asked Questions
Quick answers for confirming fitment and service value.
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