

Part number 0509937 is a cylinder that houses the piston and forms the pumping chamber in compatible sprayer pumps. This cylinder provides a precision-bore surface for the piston to create fluid pressure. It is compatible with Advantage GPX 165; SprayTech GPX 165; SprayTech GPX1600; and SprayTech LC1600 models. Replacing a worn or scored cylinder restores pumping efficiency and prevents fluid bypass.
| Part Number | 0509937 |
|---|---|
| Part Description | Cylinder |
| Fits | Advantage GPX 165; SprayTech GPX 165; SprayTech GPX1600; SprayTech LC1600 |
| Condition | New |
The 0509937 cylinder is a precision-machined component that forms the main body of the pumping section in compatible sprayer pumps. It is specifically designed for use with Advantage GPX 165; SprayTech GPX 165; SprayTech GPX1600; and SprayTech LC1600 models. This cylinder houses the piston and provides a smooth, accurately sized bore within which the piston reciprocates to create fluid pressure. The cylinder is typically made from wear-resistant materials such as hardened steel or ceramic to withstand the abrasive action of paint particles and the repeated motion of the piston. The internal surface must remain smooth and true to maintain an effective seal with the piston packings. Over time, the cylinder bore can become scored, scratched, or worn due to contamination, inadequate lubrication, or normal wear. A damaged cylinder allows fluid to bypass the piston, resulting in loss of pressure, reduced output, and inefficient operation. Symptoms of a worn cylinder include difficulty building pressure, excessive paint leakage into the lower pump section, and visible scoring on the bore surface when inspected. Replacing a worn or damaged cylinder with this genuine part restores the proper pumping chamber geometry. This ensures that the piston can create the high pressures needed for airless spraying. When replacing the cylinder, it is essential to also install new piston packings and seals and to inspect the piston rod for wear.
| Piston housing | Encloses and guides the piston |
|---|---|
| Pressure chamber | Forms the cavity where fluid is pressurized |
| Sealing surface | Provides smooth bore for piston packings |
| Pressure loss | Unable to build or maintain spray pressure |
|---|---|
| Scoring or wear | Visible scratches or grooves in bore |
| Fluid bypass | Excessive leakage past piston |
| Reduced output | Lower than normal fluid delivery |
Part number 0509937 is compatible with the following sprayer models. Always verify using your equipment's serial number and parts manual.
| Brand / Series | Specific Models |
|---|---|
| Advantage GPX | 165 |
| SprayTech GPX | 165, 1600 |
| SprayTech LC | 1600 |
When replacing the cylinder, inspecting these associated components can help ensure a complete repair.
Seal against cylinder bore; always replace.
Check for scoring or wear.
Inspect for wear or debris damage.