Part 2369440 is a replacement ball used in the fluid section of compatible airless striping equipment. This ball functions as a check valve component, seating against a corresponding valve seat to control fluid flow direction and prevent backflow during the pumping cycle. When the ball seats properly, it allows fluid to move forward through the pump while sealing against reverse flow that would otherwise reduce output pressure and cause inconsistent stripe application. Replacing a worn or damaged ball restores proper valving action and pumping efficiency on compatible units.
| Part Number | 2369440 |
|---|---|
| Part Description | Ball |
| Brand | SprayTech |
| Fits | PowrLiner 5500; PowrLiner 3500 72v (Honda gxe); PowrLiner 3000, 3500s (suffixed unit); Elite 5500; Elite 3500 72v |
| Condition | New |
Part 2369440 is a replacement ball designed for use in the fluid section of compatible PowrLiner and Elite airless striping machines. This ball serves as a critical component within the check valve assembly, working in conjunction with a valve seat to control the directional flow of coating material through the pump. During the upstroke of the piston, the ball lifts off its seat, allowing fluid to be drawn into the pumping chamber. On the downstroke, the ball is forced back onto the seat, creating a seal that prevents fluid from flowing backward and directs it forward toward the spray gun or striping head. This valving action is fundamental to the pump's ability to generate and maintain consistent operating pressure. When the ball becomes worn, pitted, or contaminated with debris, it may no longer form a complete seal against the valve seat. The result is typically described as blow-by, where pressure bleeds backward through the pump instead of being delivered to the spray tip. Operators may notice reduced output pressure, inconsistent stripe quality, difficulty priming the pump, or a pulsating spray pattern. In severe cases, the pump may fail to build pressure altogether. The ball is manufactured from wear-resistant material selected for durability in high-cycle pumping applications and compatibility with water-based and solvent-based traffic marking paints. Replacing the ball along with the corresponding valve seat restores the pump to original sealing performance and eliminates pressure loss caused by check valve failure.
| Check valve function | Opens and closes against the valve seat to control fluid flow direction through the pump |
|---|---|
| Pressure maintenance | Prevents backflow that would otherwise reduce output pressure and cause inconsistent application |
| Pump priming | Enables proper priming by allowing fluid to be drawn into the pumping chamber while preventing air from recirculating |
| Pressure loss | Pump fails to reach or maintain operating pressure despite proper adjustments |
|---|---|
| Pulsating output | Intermittent pressure or surging at the spray tip during operation |
| Difficult priming | Pump will not prime or loses prime repeatedly |
| Visible wear | Ball surface shows pitting, scoring, or uneven wear patterns |
Part 2369440 is compatible with the following PowrLiner and Elite striping equipment models.
| Equipment Model | Component |
|---|---|
| PowrLiner 5500 | Fluid section ball |
| PowrLiner 3500 72v (Honda gxe) | Fluid section ball |
| PowrLiner 3000 | Fluid section ball |
| PowrLiner 3500s (suffixed unit) | Fluid section ball |
| Elite 5500 | Fluid section ball |
| Elite 3500 72v | Fluid section ball |
When addressing pressure loss or check valve failure, these components are frequently replaced or inspected alongside the ball.
The mating surface against which the ball seals; wear or pitting prevents proper seating and should be replaced with the ball.
Worn packings allow fluid bypass around the piston, which can mimic check valve failure symptoms.
A clogged or damaged filter can restrict fluid flow and introduce debris that contaminates the ball and seat.
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