0551536 is a piston assembly used in the fluid pump of compatible RentSpray and SprayTech airless sprayers. It includes the piston rod and pre‑installed packings or seals, providing a complete replacement unit to restore pressure and pumping performance when the original piston is worn, scored, or bent.
| Part Number | 0551536 |
|---|---|
| Part Description | Piston Assembly |
| Brand | RentSpray / SprayTech |
| Fits | RentSpray 400; SprayTech Advantage EPX2155, EPX2255, GPX80 |
| Condition | New |
The 0551536 Piston Assembly is an OEM replacement component for the fluid pump of RentSpray 400 and SprayTech Advantage EPX2155, EPX2255, GPX80 airless sprayers. This assembly includes the piston rod (which connects to the drive) and pre‑installed packings or seals, ready to install directly into the pump cylinder.
A worn or damaged piston rod can cause pressure loss, poor priming, erratic spray, and accelerated packing failure. Scoring, bending, or corrosion on the rod surface damages new seals quickly. Replacing the entire piston assembly with the 0551536 restores proper rod surface finish and correct geometry, ensuring reliable pump performance without the need to transfer old packings.
| Reciprocating pumping action | Moves up and down to draw in and pressurize paint |
|---|---|
| Seal surface | Provides a smooth, hard surface for packings to seal against |
| Complete replacement unit | Includes rod and pre‑installed seals for quick installation |
| Scored or grooved rod | Visible scratches that will damage new packings |
|---|---|
| Bent rod | Runout causes uneven wear and poor sealing |
| Corrosion or pitting | Rust or chemical attack on the rod surface |
| Repeated packing failure | New seals fail quickly due to underlying rod damage |
Part 0551536 is compatible with the following models. Always verify with your machine's parts diagram before ordering.
| Brand / Model | Component |
|---|---|
| RentSpray 400 | Piston assembly (with pre‑installed packings) |
| SprayTech Advantage EPX2155 | Piston assembly |
| SprayTech Advantage EPX2255 | Piston assembly |
| SprayTech Advantage GPX80 | Piston assembly |
When replacing the piston assembly, these related components are often inspected or replaced at the same time.
Check the bore for scoring or wear that could damage the new piston.
Inspect for wear at the pin connection; replace if loose or damaged.
If the piston assembly does not include all seals, order a repacking kit (e.g., 0551533).
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