Part 315-500 is a major pump service kit containing the complete set of wear components needed for comprehensive overhaul of the fluid section on compatible Hydra M and Hydra Pro series airless paint sprayers. This kit includes seals, packings, o-rings, and the piston rod assembly. Servicing the pump with this kit restores full pumping performance when minor seal replacement is insufficient due to piston or cylinder wear.
| Part Number | 315-500 |
|---|---|
| Part Description | Major Pump Service Kit |
| Brand | Hydra |
| Fits | Hydra M and Hydra Pro series |
| Condition | New |
The Hydra 315-500 major pump service kit provides all components necessary for a complete overhaul of the fluid section on compatible Hydra M and Hydra Pro series airless paint sprayers. This comprehensive kit includes not only the seals, packings, and o-rings found in a minor service kit but also the piston rod assembly. The piston rod is a critical wear component that operates in direct contact with the packings; when the rod surface becomes scored, pitted, or worn beyond tolerance, replacing only the seals will not restore proper pump performance.
Over extended service intervals or when operating with abrasive materials, the piston rod can develop surface damage that compromises the sealing integrity of the fluid section. Signs that a major overhaul is required include persistent pressure loss after a minor kit installation, visible scoring on the piston rod during inspection, or recurring seal failure within a short period. In these cases, installing the 315-500 major kit addresses the root cause rather than just the symptoms, restoring the pump to like-new condition and extending overall equipment life.
This major kit includes the upper and lower packing, vee packing, o-rings, seals, and the complete piston rod assembly. Installation requires full disassembly of the pump fluid section, removal of worn components, and careful reassembly with the new parts. Proper lubrication of seals and the piston rod during installation is essential to prevent initial wear and ensure correct seating. Operators with mechanical experience can perform this overhaul, though attention to detail is required to avoid damage to new components during assembly.
Performing a major pump service when indicated prevents more extensive damage to the cylinder housing and other pump components. For facilities with high usage or those spraying abrasive coatings, keeping a 315-500 major kit on hand allows immediate response when minor service no longer resolves performance issues. When overhauling the pump, also inspect the cylinder bore for scoring, clean all fluid passages, and replace any inlet or outlet valves that show signs of wear to ensure complete restoration of pumping performance.
| Complete seal restoration | Replaces all seals, packings, and o-rings in the fluid section |
|---|---|
| Piston rod replacement | Includes new piston rod to address scoring or surface wear |
| Full performance recovery | Restores pressure output and eliminates leakage when minor kit is insufficient |
| Persistent pressure loss | Minor kit replacement did not resolve pressure or bypass issues |
|---|---|
| Scored piston rod | Visible grooves, pitting, or wear on the rod surface during inspection |
| Rapid seal failure | New seals fail within a short period after minor service |
| Extended service interval | Pump has exceeded normal service life and requires comprehensive overhaul |
Hydra part 315-500 is compatible with the following models. Always confirm fitment using the correct parts diagram for your exact machine.
| Model | Component |
|---|---|
| Hydra M and Hydra Pro 2000_4000 | Major pump service kit |
| Hydra M and Hydra Pro Super | Major pump service kit |
| 0528925N_2000_4000 | Major pump service kit |
When performing a major pump service, these related components are often inspected or replaced at the same time to ensure complete repair and reliable operation.
Inspect the cylinder bore for scoring, pitting, or wear that would compromise new seals and the piston rod.
Check valves for wear, debris, or damage that may affect priming and pressure consistency.
Replace or clean the inlet strainer and fluid filter to prevent contaminants from damaging new components.
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