

SprayTech part 704-551A is a piston rod designed to transfer motion within the pump assembly of compatible sprayer systems. This component plays a key role in driving fluid movement, maintaining pressure, and ensuring smooth pump operation. It supports efficient performance, consistent output, and reliable system function. This part restores proper mechanical motion and dependable operation on compatible units.
| Part Number | 704-551A |
|---|---|
| Part Description | Piston Rod |
| Brand | SprayTech |
| Fits | Advantage 400; Advantage 500; Helix LP; Impact 410; Impact 440 service; Impact 640 I and IA; Impact 640; RentSpray 500; RentSpray 600 Impact |
| Condition | New |
The SprayTech 704-551A Piston Rod is a critical mechanical component within the pump assembly, responsible for transferring motion that drives fluid movement in sprayer systems. On compatible units such as the Advantage 400 and 500, Helix LP, Impact series models, and RentSpray equipment, this part plays a central role in maintaining consistent pressure and ensuring efficient pump operation. The piston rod connects moving components within the pump, converting motor or hydraulic force into the reciprocating motion needed to move coating material through the system. Proper function is essential for achieving stable spray output, maintaining pressure consistency, and supporting overall equipment performance. Over time, piston rods may experience wear, scoring, or damage due to continuous operation, high-pressure conditions, or exposure to abrasive materials. These issues can result in reduced efficiency, pressure loss, or irregular operation. Replacing the piston rod restores smooth mechanical motion, improves pump performance, and helps maintain reliable operation under both standard and demanding working conditions.
A worn or damaged piston rod may lead to pressure loss, uneven pump operation, or reduced efficiency. Replacing this component helps restore proper motion and consistent system performance.
| Motion transfer | Converts drive force into reciprocating pump movement |
|---|---|
| Fluid movement | Supports consistent flow of coating material |
| Pressure support | Maintains stable output during operation |
| Surface wear | Scoring or visible damage on the rod |
|---|---|
| Pressure loss | Reduced or inconsistent pump output |
| Uneven motion | Irregular pump cycling during operation |
| Reduced efficiency | Decline in overall system performance |
Part 704-551A is compatible with the following models:
| Model | Component |
|---|---|
| Advantage 400 | Piston rod |
| Advantage 500 | Piston rod |
| Helix LP | Piston rod |
| Impact 410 | Piston rod |
| Impact 440 service | Piston rod |
| Impact 640 I and IA | Piston rod |
| Impact 640 | Piston rod |
| RentSpray 500 | Piston rod |
| RentSpray 600 Impact | Piston rod |
Work with the piston rod to maintain sealing and pressure
Prevent leakage and support smooth rod movement
Transfer motion to the piston rod for pump operation