Graco Ultra 500 Lo‑Boy Electric Airless Sprayer – Complete Parts & Maintenance Breakdown
The Graco Ultra 500 is a dependable graco electric paint sprayer built for contractors and homeowners alike. With a compact Lo‑Boy cart design, this unit delivers up to 2750 psi maximum spray pressure. The Ultra 500 harnesses a ½ HP motor, robust pump, and reliable components, letting you tackle hallway walls or fence panels with the same precision as larger sprayer systems.
To maintain its longevity and performance, it’s essential to understand its internal layout and the paint sprayer parts that keep it running—especially if you're pairing it with a graco airless spray gun.
Key Components You Need to Know
Here’s a breakdown of the Ultra 500’s major parts:
1. Motor & Drive Assembly
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½ HP electric motor (220–678) paired with gear reducer (218–364) and crankshaft assembly (218–242) provide smooth, steady fluid delivery.
2. Displacement Pump (222–584)
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An internal fluid section rated for 2750 psi; includes piston assembly, rod, packings, and valve components laid out through items 202–225.
3. Bearing & Drive Housing
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Drive housing (223–100) supports coupling between motor gearbox and pump assembly; critical for avoiding rod misalignment.
4. Filters & Seals
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Stainless steel inlet strainer and 60‑mesh fluid filter protect internal parts from clogs.
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Throat Seal Liquid (206–994) ensures seal longevity between sessions.
5. Pressure Control Unit (220–455)
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Features valve, circuit board, switch, potentiometer, and power cord—responsible for maintaining spray pressure with a maximum of 2750 psi.
6. Hoses & Spray Gun
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Standard setup includes grounded Hoses (½″ and whip) with spring guards and a compatible graco airless spray gun—the classic Contractor PC-style model fitted with RAC IV tip guard and SwitchTip system.
Why Genuine Parts Matter
Using OEM graco paint sprayer parts ensures:
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Proper pressure ratings and safety—especially for high-pressure parts like hoses, seals, and fittings.
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Long-term durability thanks to hardened components and premium materials.
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Compatible wear parts like graco magnum x5 parts—many spray tips, guards, and hose fittings used in Magnum systems fit perfectly with the Ultra 500.
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Warranty continuity and technical support.
Replacement Pump Options & Maintenance
Displacement Pump Maintenance
Upgrade your fluid section using OEM graco replacement pump kits (ProConnect style), complete with piston rod and seal packings.
DIY Pump Rebuild
Order graco pump repair kits (number 222–587) that include packings, pistons, seals, and valves—great for restoring worn pumps.
Professional Pump Repair
If assembling isn’t your preference, look for graco pump repair near me. Certified service centers routinely rebuild or replace fluid sections to Graco spec for fast results and peace of mind.
Routine Care & Best Practices
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Clean & Flush Regularly
After every project, flush hoses and pumps with water, then mineral spirits. Store with TSL to protect seals. -
Replace Filters Frequently
Inspect and swap outlet filters monthly or after ~500 gallons. A clogged fluid filter can starve the pump and cause premature wear. -
Torque Maintenance Hardware Correctly
Follow the manual’s torque specs (e.g., retaining nuts at 95 N·m) to keep connections tight and leak-free. -
Check Hose Integrity
Look for bulges or cracks, particularly at fittings and whip ends. Replace compromised hoses and ensure hoses match pumps’ pressure rating. -
Upgrade Pump Preemptively
Installing a graco replacement pump proactively every 2–3 years or 1,000–1,500 gallons saves costly downtime later.
Accessory Compatibility & Options
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Use RAC IV SwitchTip guards that align with graco magnum x5 parts, offering flexible nozzle and filter options.
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Add extension wands or pole guns for high or detailed areas.
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Use quick-coupler accessories like whip hoses and pressure gauges to optimize spray flow.
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Stock consumables like TSL, pump armor, and seal kits to ensure consistency.
Troubleshooting & Local Service Options
Low Pressure or Spitting Gun?
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Likely causes include clogged filters, worn packings, or a weak pump. Graco replacement pump swap or pump repair kits can correct most issues.
Leaks Around Pump?
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Inspect and replace seals or O-rings. If the leak persists, combine housing and pump replacement.
Still Stuck?
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Search graco pump repair near me for specialized service at authorized centers—they can diagnose issues quickly and get you running again.
Final Takeaway
The Graco Ultra 500 Lo‑Boy is a rugged, efficient graco electric paint sprayer, perfect for moderate-to-heavy-duty projects. Keeping it operational hinges on maintaining OEM components—graco replacement pumps, filter assemblies, hoses, guns, and seals. Tools like graco pump repair kits or ProConnect pump assemblies enable either DIY fixes or quick swaps.
Combining this unit with standard graco magnum x5 parts streamlines inventory and accessory compatibility. And if issues escalate, locating a graco pump repair near me ensures you can restore the machine to factory-standard performance quickly.
For complete parts diagrams, OEM numbers, and same-day shipping, visit SprayersAndParts.com—a one-stop resource for service, support, and sprayer excellence.