Graco 287835 – Pump Packing Repair Kit (Overview & Compatibility)
Compatible Machines
- Graco GH 833 Gas Hydraulic Airless Sprayer
What is the Graco 287835 Pump Packing Repair Kit?
The 287835 is an OEM packing repair kit for the pump section. It replaces the critical seals/packings in the pump lower to restore pressure, stop fluid leaks, and maintain prime/flow. Ideal when you notice pressure drop, weeping at the wet cup, difficulty priming, or material bypass.
Key Specs & Quick Facts
| Part Number | 287835 |
| Type | Pump Packing Repair Kit (OEM) |
| Primary Application | GH 833 pump lower packing service |
| Purpose | Restore sealing integrity, prevent leaks, recover pressure & spray performance |
| When to Use | Visible fluid at wet cup, loss of pressure, poor prime, or packing wear after heavy use |
| Genuine/OEM | Yes – Graco Original |
Why Choose This Kit
- OEM fit & materials matched to GH 833 pump design
- Restores performance—pressure, prime, and spray consistency
- Prevents downtime from leaks and accelerated rod wear
- Cost-effective vs. full pump lower replacement (when the lower is otherwise serviceable)
Installation & Use Tips
- Confirm your exact pump lower model/revision before teardown.
- Clean work area; avoid contaminating packings and rod during assembly.
- Use recommended lubricants and follow torque specs from the service manual.
- After rebuild, wet the packings, prime with compatible solvent/material, and check for leaks.
- Maintain proper throat/wet-cup fluid level to extend packing life.
Frequently Asked Questions
Check the model (e.g., GH 833) and the exact pump lower part number. If your pump lower matches the GH 833 configuration that uses this kit, you’re good. When in doubt, cross-reference your pump lower number or contact support with your unit’s serial/model details.
Persistent leaks at the wet cup, loss of pressure, difficulty maintaining prime, or visible wear on the piston/rod are common signs that the packing set needs replacement.
Standard mechanic’s tools usually suffice. Follow the service manual for safe disassembly/assembly, torque specs, and any alignment procedures. Keep the area clean to avoid damaging new seals.
For high-output rigs like the GH 833, OEM kits ensure material compatibility, fit, and longevity consistent with the original design. They’re recommended to maintain performance and reliability.
Keep the wet cup properly filled, filter materials, flush after use with compatible solvent, and store the sprayer per Graco guidelines. Avoid running abrasive or incompatible materials through the pump.
