Hydra part 314-004 is an upper/lower spring used in the pump fluid section of compatible sprayers to maintain constant tension on the packings. This spring works between the upper and lower spring retainers, applying consistent pressure to the packings to ensure they maintain an effective seal against the piston during operation. It is an essential replacement part during pump rebuilds on Hydra M and Hydra Pro Super models.
| Part Number | 314-004 |
|---|---|
| Part Description | Upper/Lower Spring |
| Brand | Hydra |
| Fits | Hydra M, Hydra Pro Super |
| Condition | New |
The Hydra 314-004 upper/lower spring is a precision coil spring that fits between the upper and lower spring retainers in the pump fluid section. It applies consistent, controlled pressure to the packing set, ensuring the packings maintain continuous contact with the piston throughout the operating cycle.
This spring compensates for normal wear of the packings and accommodates thermal expansion, maintaining optimal sealing force over time. Springs can lose tension due to metal fatigue, corrosion, or repeated compression cycles. A weak or broken spring allows packings to loosen, leading to fluid bypass, pressure loss, and accelerated wear of other components. Replacing the spring during pump service restores proper packing tension and extends pump life.
| Maintains packing tension | Applies constant pressure to keep packings sealed against the piston |
|---|---|
| Compensates for wear | Automatically adjusts as packings gradually wear down |
| Prevents fluid bypass | Ensures packings remain in contact during pressure fluctuations |
| Absorbs vibration | Helps dampen movement that could loosen packings |
| During packing replacement | Always replace spring when changing packings |
|---|---|
| Loss of pressure | Weak spring may allow packings to loosen |
| Visible corrosion | Rust or pitting weakens the spring material |
| Broken or distorted spring | Physical damage requires immediate replacement |
| Fatigue from age | Springs lose tension over many operating hours |
Hydra part 314-004 is designed for use with the following sprayer models. Always verify your pump configuration before ordering.
| Brand / Model | Component |
|---|---|
| Hydra M | Upper/Lower Spring |
| Hydra Pro Super | Upper/Lower Spring |
When replacing the packing spring, these components are often replaced or inspected to ensure a complete fluid section overhaul.
Holds the upper end of the spring; replace if worn.
Holds the lower end of the spring; replace if worn.
The spring provides tension for the packings; replace together.
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