Overview & Compatibility
Compatible Machines
This kit services specific Graco pneumatic airless pump lowers that use the Q-Pump style packing stack.
- • Graco 30:1 Bulldog pneumatic pumps (Q-Pump style)
- • Graco 63:1 King pneumatic airless pumps (selected models with Q-Pump lowers)
What is the Graco 220399 Pump Repair Kit?
The Graco 220399 Pump Repair Kit is a maintenance kit for refurbishing the pump lower’s internal sealing stack on compatible Bulldog/King pneumatic units. Typical contents include pre-assembled gland/packing stacks, shims, and sealing elements designed to restore pressure, reduce leakage, and extend service life.
Kit Contents & Quick Specs
| Part Number | 220399 (Kit, Pump Repair) |
| Packing Materials | Leather & polyethylene (PE) sealing elements (typical Q-Pump stack) |
| Intended Use | Rebuild/refresh pump lower packings to recover pressure and eliminate fluid leaks |
| Typical Platforms | 30:1 Bulldog, 63:1 King (Q-Pump configuration) |
Why use this kit?
- Restores atomization pressure and consistent output
- Reduces internal bypass and fluid leakage
- Pre-assembled components help speed up service and ensure correct stack height
Fit Guidance
- Match your pump lower style (Q-Pump) and platform (Bulldog / King) before ordering.
- Check your pump’s tag/plate or parts manual to confirm the correct repair kit number.
- If uncertain, cross-reference your pump lower assembly in the service manual.
Installation Notes
- Clean all mating surfaces; inspect rod/cylinder for scoring before reassembly.
- Lubricate packings as recommended; observe torque specs and stack sequence.
- After rebuild, prime with compatible solvent/coating and verify there are no leaks.
Frequently Asked Questions
Not all variants. It fits models that use the Q-Pump style lower. Always verify your pump lower and part number in the manual before purchase.
Loss of pressure, pulsation, material leaking past packings, or frequent re-priming are common signs that packings are worn and need replacement.
Basic hand tools typically suffice. Follow the service manual for safe disassembly, packing order, and torque values. A soft-jaw vise and assembly lube are helpful.
Leather and polyethylene (PE) elements are commonly used in this kit to balance sealing, lubrication retention, and durability for high-pressure use.
After reassembly, prime with compatible solvent or material at low pressure, check for leaks, then gradually ramp to operating pressure while monitoring performance.
