SprayTech part 704-560 is a piston assembly used in the pumping section of airless sprayers. It creates the reciprocating action that draws paint in and pushes it out under high pressure. This assembly includes the piston rod, piston ball, and retaining components. Replacing a worn or damaged piston assembly helps restore proper pressure, reduce surging, and improve spray pattern quality.
| Part Number | 704-560 |
|---|---|
| Part Description | Piston Assembly |
| Brand | SprayTech |
| Fits | 440IX, 540IX, 640IX; PowrLiner 2800; RentSpray 600, 500 (select models) |
| Condition | New |
The SprayTech 704-560 Piston Assembly is a precision‑engineered component that drives the pumping action in compatible airless sprayers. As the piston reciprocates, it creates suction to draw paint into the fluid section and then pushes it out at high pressure through the hose and spray tip.
Over time, the piston ball, rod, and sealing surfaces can wear due to abrasives in the paint or normal use. A worn piston assembly leads to pressure loss, surging, and poor spray patterns. Replacing it with genuine SprayTech part 704-560 restores pump efficiency and reliable performance.
| Pressure generation | Converts motor rotation into reciprocating motion to build hydraulic pressure |
|---|---|
| Fluid delivery | Draws paint from the supply and pushes it out at high pressure |
| Sealing | Works with packings to prevent backflow and maintain consistent output |
| Loss of pressure | Gun sputters or pressure drops even with clean filters and tips |
|---|---|
| Fluid leakage | Paint leaks from the throat area or around the pump |
| Visible wear | Scored piston rod, worn ball, or damaged retaining components |
| Inconsistent spray | Surges, uneven pattern, or difficulty priming |
SprayTech part 704-560 is compatible with the following airless sprayer models. Always confirm fitment using the correct parts diagram for your exact model and revision.
| Model | Component |
|---|---|
| Airless Sprayer 440IX | Piston Assembly |
| Airless Sprayer 540IX | Piston Assembly |
| Airless Sprayer 640IX | Piston Assembly |
| PowrLiner 2800 | Piston Assembly |
| RentSpray 600 | Piston Assembly |
| RentSpray 500 | Piston Assembly |
Pump performance issues often involve multiple wear components. When replacing the piston assembly, these parts are usually inspected and replaced at the same time.
Worn or hardened packings allow fluid bypass, causing pressure loss and leakage.
A stuck or worn inlet ball prevents proper priming and reduces output.
A damaged outlet valve can cause pressure fluctuations and poor spray performance.
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