Graco 15R978 Adapter Pump Lower 75cc 3.5in
$164.00
Available to Order
The **Graco 15R978 Adapter** enhances your sprayer’s fluid capacity with a 75 cc lower-section setup for higher output.
- 75 cc fluid displacement
- Built for 3.5″ lower section
- Stainless steel construction
- Stability and reliability in high-demand applications
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Genuine OEM Part
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Graco 15R978 Adapter Pump Lower – 75 cc, 3.5″ for Enhanced Fluid Output
Compatible Machines
- Graco 75 cc lower-section pump sprayers
- Modular high-output airless sprayers using a 3.5″ lower assembly
- Professional systems requiring increased fluid capacity and longer stroke
The **Graco 15R978 Adapter** allows your sprayer to upgrade or maintain a 75 cc displacement lower pump section. Its precision-machined construction supports stable, high-volume fluid delivery for demanding applications.
Key Features
| Part Number | 15R978 |
|---|---|
| Displacement Volume | 75 cc |
| Length of Lower Section | 3.5 in |
| Material | Stainless steel, precision-machined internals |
| Intended Use | High-capacity, industrial spray systems |
Installation & Usage Tips
- Shut off fluid and air supply before disassembling the lower pump.
- Align coupling carefully to prevent cross-threading.
- Use a torque wrench and tighten to recommended torque to secure the adapter.
- After installation, run several pump cycles to verify there are no leaks and the flow is stable.
- Inspect periodically and clean during maintenance to avoid buildup inside the fluid path.
Frequently Asked Questions
Yes — by coupling to a 75 cc lower section, it increases the displacement per pump cycle, enabling higher fluid output.
Yes — the stainless-steel construction and seal design support a wide range of coatings including solvent-based types.
It is specifically designed for 3.5″ lower assemblies; using it with other lengths may lead to misalignment or poor sealing.
Inspect when doing major maintenance or after heavy use — check for any signs of leakage, thread wear, or material fatigue.
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