704-274 is a complete fluid section assembly for compatible Airless Sprayer 340 and 440I models. It includes the cylinder, piston, packings, inlet and outlet valves, and all seals required to restore pump performance. This assembly replaces the entire fluid housing as a single unit.
| Part Number | 704-274 |
|---|---|
| Part Description | Fluid Section Assembly |
| Brand | Airless Sprayer |
| Fits | Airless Sprayer 340, 440I |
| Condition | New |
The 704-274 Fluid Section Assembly is a complete, pre‑assembled fluid pump section designed for Airless Sprayer 340 and 440I models. It replaces the entire pump housing, piston, packings, valves, and seals as one unit. This assembly is ideal for sprayers with severe wear, corrosion, or damage to the cylinder bore that cannot be repaired with a standard seal kit.
Over time, the pump cylinder can become scored, the piston rod worn, and the valve seats eroded. Replacing individual components may not restore full performance if the housing itself is compromised. The 704‑274 assembly restores the pump to factory specifications, eliminating pressure loss, priming failures, and external leaks.
| Complete pump replacement | Provides a fully assembled fluid section ready to install |
|---|---|
| Restores pressure & flow | New cylinder, piston, and valves eliminate wear issues |
| Eliminates multiple failure points | Replaces all wear components in one assembly |
| Scored or worn cylinder bore | Deep scratches that cannot be honed out |
|---|---|
| Repeated seal failure | New packings fail quickly due to housing damage |
| Cracked fluid housing | Visible crack causing external leak or structural weakness |
| Major overhaul | Complete rebuild after years of heavy use |
Part 704-274 is compatible with the following Airless Sprayer models. Always verify with your machine's parts diagram before ordering.
| Brand / Model | Component |
|---|---|
| Airless Sprayer 340 | Complete fluid section assembly |
| Airless Sprayer 440I | Complete fluid section assembly |
When replacing the fluid section assembly, these related components are often inspected or replaced at the same time.
Inspect for wear at the pin connection; replace if loose or damaged.
Check for flatness and thread integrity.
Inspect the hose and fittings for leaks or damage.
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