Compatible Machines for the 15G204 Nut, Retaining
- Graco GH-833 Displacement Pump (4 GPM flow band)
- Graco 287834 Displacement Pump (4 GPM flow band)
- Graco ProContractor Series Pump Kits – 4 GPM models
Product Overview
The 15G204 Nut, Retaining is a critical fastening component engineered for demanding airless spray systems. It secures the internal assemblies of high-performance pump modules, maintaining alignment and preload of sealing stacks in 4 GPM equipment.
Key Features
| Part Number | 15G204 |
| Flow Band | 4 GPM |
| Function | Retaining nut that holds pump rod packing/seal assemblies under axial load |
| Construction | High-strength stainless steel or hardened alloy, precision-machined threads |
Materials & Performance
Manufactured from high-grade stainless steel or a hardened alloy, this retaining nut is built for robust service in aggressive spraying environments. The precision-turned threads ensure even load distribution, reduce risk of loosening under vibration, and help protect adjacent seal components from premature wear.
Installation & Maintenance
- Use a calibrated torque wrench to install—proper preload prevents thread galling and ensures long service life.
- Inspect the nut and mating housing threads periodically, especially after exposure to abrasive or chemically aggressive coatings.
- Replace the nut if you observe radial play, thread deformation, loosening under load, or leakage at the interface.
- Maintain upstream filtration and keep fluid systems clean to optimize overall component lifespan.
Applications
This component is suitable for industrial airless spray systems, plural-component equipment, fluid dispensing modules and high-volume finishing lines. Wherever consistent rod alignment, seal integrity and minimal downtime are priorities, the 15G204 retaining nut supports professional performance.
Frequently Asked Questions
A retaining nut holds the internal packing or seal stack under proper axial pressure, preventing vibration-induced loosening, maintaining alignment and ensuring reliable sealing performance in high-pressure spray applications.
The 15G204 nut is optimized for 4 GPM pump systems. Using it in a higher-flow band may result in inadequate load distribution, faster wear, or compromised seal performance due to mismatched mechanical dynamics.
Replace the nut if you detect looseness, thread damage, leaking at the seal interface or if maintenance history shows repeated disassembly. Regular inspection during major service intervals ensures optimal performance.
