Part 155-906 is a replacement upper packing spring for compatible Admiral and Commander spray equipment. This spring applies constant pressure to the upper packings, ensuring a proper seal around the piston rod. When the original spring becomes weakened, sagged, or broken, replacement restores effective sealing and prevents leaks.
| Part Number | 155-906 |
|---|---|
| Part Description | Upper Packing Spring |
| Brand | Universal |
| Fits | Admiral; Commander |
| Condition | New |
The 155-906 upper packing spring is a direct replacement component for Admiral and Commander spray equipment. This precision spring is installed in the pump assembly, where it applies constant, controlled pressure to the upper packing set. The upper packings create a dynamic seal around the piston rod, preventing fluid from leaking out of the pump during operation. The spring ensures that the packings maintain proper contact with the rod, compensating for wear and slight variations in dimensions. This continuous pressure is essential for effective sealing and long packing life. A properly functioning spring maintains consistent sealing force. A weakened, sagged, or broken spring can result in insufficient packing pressure, leading to fluid leaks, loss of pressure, and accelerated wear of both packings and the piston rod. Symptoms may include fluid leakage from the top of the pump, pressure drops, or erratic operation. This replacement spring is manufactured to exact specifications for wire diameter, coil count, free length, and spring rate. Installation requires careful handling and proper positioning within the packing gland.
| Packing tension | Applies constant pressure to upper packings |
|---|---|
| Seal maintenance | Ensures packings contact rod for effective seal |
| Wear compensation | Adjusts for packing wear over time |
| Weakened / sagged | Spring no longer provides sufficient pressure |
|---|---|
| Broken spring | Spring fractured, no force applied |
| Corrosion damage | Rust has compromised spring integrity |
| Fluid leakage | Leaks past upper packings due to low tension |
Upper packing spring 155-906 is compatible with the following models. Verify fit using your equipment's parts diagram.
| Compatible Models |
|---|
| Admiral |
| Commander |
When replacing the upper packing spring, inspect these associated components to ensure proper pump sealing.
Replace if worn or damaged.
Check for scoring or wear.
Ensure clean and undamaged.
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