PowrLiner part 0290350 is a spring used in the pressure control or unloader valve assembly on compatible PowrLiner sprayers. This spring provides the necessary tension for accurate pressure regulation and proper valve operation. Replacing a worn or fatigued spring restores consistent pressure control and reliable sprayer performance.
| Part Number | 0290350 |
|---|---|
| Part Description | Spring |
| Brand | PowrLiner |
| Fits | 3500 72v, 3500, 3500s, 4500, 4955, 6955, 8955, 5500 |
| Condition | New |
The PowrLiner 0290350 Spring is an original equipment replacement part designed for multiple PowrLiner airless sprayer models. This spring is typically found in the pressure control mechanism or unloader valve, where it provides the counterforce needed to regulate pressure and ensure proper valve seating.
Over time, springs can lose tension (fatigue), become corroded, or break due to repeated cycling. A weak or broken spring can cause pressure fluctuations, inconsistent spray patterns, or failure of the unloader to function correctly. Replacing the spring restores proper system response and reliable pressure control.
| Pressure regulation | Provides tension against pressure-adjusting mechanisms |
|---|---|
| Valve return | Returns unloader or check valve to closed position when pressure drops |
| Damping | Helps smooth out pressure fluctuations during operation |
| Pressure surging | Fluctuating pressure during spraying despite correct settings |
|---|---|
| Low pressure | Unable to reach normal operating pressure |
| Valve stuck | Unloader or check valve fails to open or close properly |
| Visible damage | Broken, bent, or heavily corroded spring |
PowrLiner part 0290350 is compatible with the following PowrLiner airless sprayers. Always confirm fitment using the correct parts diagram for your exact model and revision.
| PowrLiner Model | Component |
|---|---|
| PowrLiner 3500 72v | Spring |
| PowrLiner 3500 | Spring |
| PowrLiner 3500s | Spring |
| PowrLiner 4500 | Spring |
| PowrLiner 4955 | Spring |
| PowrLiner 6955 | Spring |
| PowrLiner 8955 | Spring |
| PowrLiner 5500 | Spring |
When servicing the spring, inspect these associated components for wear or damage.
The spring is often housed within the unloader; check seals and seats.
Deteriorated seals can cause pressure loss and should be replaced.
Ensure the adjusting mechanism moves freely and is not binding.
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