

PAINT HEAD, MACH.
SprayTech part 2429778 is a machined paint head designed for the fluid section of compatible striping and airless sprayers. This precision-machined component houses the inlet and outlet valves, piston bore, and sealing surfaces that control material flow and pressure generation. When the paint head becomes worn, scored, or damaged, symptoms may include pressure loss, reduced output, fluid leakage, or erratic spray performance. This replacement paint head restores proper pumping function on compatible PowrLiner and Elite units.
| Part Number | 2429778 |
|---|---|
| Part Description | Machined Paint Head |
| Brand | SprayTech |
| Fits | PowrLiner 3500 72v (Honda gxe); PowrLiner 3000, 3500s (suffixed unit); Elite 3500 72v |
| Condition | New |
The SprayTech 2429778 Machined Paint Head is a precision-engineered component that serves as the core of the fluid section in compatible PowrLiner and Elite 3500 series striping and airless sprayers. This paint head is manufactured from high-quality material and machined to exacting tolerances to create the critical surfaces that control material flow, pressure generation, and sealing integrity. The paint head houses the inlet valve, which draws coating material from the container during the suction stroke, and the outlet valve, which directs pressurized material to the spray gun during the pressure stroke. The component also contains the precision-bored cylinder where the piston reciprocates, creating the alternating suction and pressure cycles that generate pumping action. All sealing surfaces, valve seats, and the piston bore are machined to specific dimensions and surface finishes that are essential for proper pump operation. The paint head also includes threaded ports for the suction hose, return hose, pressure gauge, and outlet connection to the spray hose. In pavement striping applications with the PowrLiner series and in general painting with the Elite 3500 72v, the paint head is subjected to significant mechanical and hydraulic stresses. Over time, several failure modes can affect the machined paint head. The piston bore can become scored or worn from contact with the piston or from abrasive materials passing through the pump. Valve seats can become eroded or pitted, preventing the inlet or outlet valves from sealing properly. Threads can become damaged from over-tightening or corrosion. The paint head body can develop cracks from impact damage or from freezing of material left in the pump. Symptoms of a worn or damaged paint head include pressure loss that cannot be resolved by replacing valves or packings, fluid leakage from the paint head body, difficulty priming, reduced output volume, and visible scoring or damage to the bore or sealing surfaces during inspection. The 2429778 machined paint head is a genuine SprayTech replacement part manufactured to the original specifications. Replacing a damaged paint head restores the precision surfaces necessary for proper valve function, piston sealing, and pressure generation. This component is typically replaced when individual valve or packing replacements no longer restore performance, indicating that the paint head itself has worn beyond serviceable limits.
| Fluid pumping |
|---|
| Pressure generation |
| Fluid distribution |
| Pressure loss |
|---|
| Bore damage |
| Fluid leakage |
| Thread damage |
SprayTech part 2429778 is compatible with the following airless sprayer models. Always confirm fitment using the correct parts diagram for your exact model and revision.
| Sprayer Model | Component |
|---|---|
| PowrLiner 3500 72v (Honda gxe) | Machined paint head |
| PowrLiner 3000, 3500s (suffixed unit) | Machined paint head |
| Elite 3500 72v | Machined paint head |
When replacing the machined paint head, it is an opportune time to inspect or replace these related components.
Inspect the piston rod for scoring, corrosion, or wear. A damaged rod will compromise any new paint head and should be replaced at the same time.
Install new inlet and outlet valves when replacing the paint head to ensure complete restoration of pumping performance.
Replace the piston packings to ensure proper sealing within the new paint head bore and prevent premature wear.