When a deadline looms and profit margins are on the line, contractors reach for the gas-powered Graco GMAX II 5900 Lo-Boy. This low-center-of-gravity workhorse delivers up to 1.6 GPM at 3300 psi, driven by a rugged Honda 200 cc engine—a spec that makes it the go-to unit for large residential, commercial and light-industrial coating jobs.
SprayersAndParts.com is a factory-authorized distributor stocking every nut, seal and spray guard you need to keep that performance curve locked in. From graco spray guard upgrades to speciality airless paint sprayer attachments, we provide genuine components that bolt.
Graco GMAX II 5900 Lo-Boy: Field-Proven Power
- Flow Rate 1.6 GPM (6.1 L min-¹)—blankets block walls fast with fewer passes.
- Maximum Working Pressure 3300 psi—atomises high-solids acrylics, elastomerics and solvent-borne enamels without thinning.
- Max Tip 0.043 in—run a RAC X 543 on heavy primers, or dial back to a 517 for trim.
- Honda GX160/GX200 Engine—easy-start, low-vibration, EPA compliant.
- Contractor PC™ Gun & 50 ft Hose—standard in-box for out-of-the-crate productivity.
- ProConnect™ Pump Module—swap the lower in under 60 seconds, cutting downtime on multi-crew projects.
Every SKU on our site lists thread pitch, material grade and torque spec so you can cross-reference in seconds—no more guessing which kit fits your serial number.
Cross-Platform Compatibility: Stock Once, Service Many
The beauty of Graco’s modular design is parts commonality across the fleet. By filling one shelf with OEM spares you can service electric, gas and handheld units alike, slashing inventory overhead.
Gas Sprayer Family
- GMAX II 3900 & 7900—share the same RAC X tip guards, high-pressure hoses and Easy-Out filter cores with the 5900.
- GMAX 3400—identical inlet strainers and pump packings simplify field kits.
Electric & Cordless Line-up
- Ultra Max II 490 PC Pro—shares ProConnect pump seals; great for crews running one gas and one electric rig.
- Magnum X7—SG2 gun and RAC V/X tips plug straight into 5900 hoses for backup duty.
- TrueCoat 360 VSP—spray-guard adapters let you reuse tips between handheld and cart units.
- Project Painter Plus—RAC V guard and 50-mesh filters match our universal service kits.
Spray Guard & Tip Systems
Graco 246215 RAC X Hand-Tite Spray Guard threads onto every GMAX, Ultra, Magnum X and TrueCoat gun except legacy pole models—perfect if you manage mixed-age fleets.
Why Genuine Beats Generic Every Time
- Exact Tolerances—OEM piston rods are polished to ±2 µm, preventing premature seal wear and pressure fluctuations.
- Full 3300 psi Rating—copycat packings often implode at 2500 psi; Graco tests every lot to spec.
- BlueLink™ Ready—OEM pumps include the data port for Bluetooth job tracking; no drilling required.
- Sustainability—Graco’s recyclable cartons and RoHS-compliant alloys help you hit green-building bids.
Pro Tips to Extend Pump Life (and Your Margin)
- Track Engine Hours—log every 50 hours; a five-minute oil change keeps the GX engine warranty intact.
- Schedule Pack-Offs—replace lower seals every 500 gallons; costs pennies, saves pistons.
- Pair Seals with TSL™—fresh throat seal lubricant doubles leather life and wards off ceramic scoring.
- Colour-Code Bins—green for graco handheld sprayers, red for airless paint sprayer attachments, blue for gas rig parts—no more mix-ups.
- Keep a Spare Gun—an graco magnum X7 replacement spray gun costs less than one hour of crew downtime.
Frequently Asked Questions
- Can I run two guns on the 5900?
- Yes. Use a 2-gun manifold and drop each tip to 0.021 in for balanced flow.
- Will a 490 PC Pro pump lower fit my 5900?
- Piston diameter differs, but packings, seals and filter elements are identical, so you can stock one universal kit.
- Which spray guard fits both Magnum X7 and GMAX II?
- 246215 RAC X guard threads onto both SG2 and Contractor PC guns—one part, two platforms.
Ready to Boost Job-Site Efficiency?
Add genuine Graco GMAX II 5900 Lo-Boy Series parts—plus Graco sprayer accessories that fit everything from truecoat 360 VSP parts to graco handheld sprayers—to your cart today. Experience the peace of mind that comes from running 100 % OEM.
Find genuine Graco GMAX II 5900 Lo-Boy Series List parts—fast shipping & pro advice at SprayersAndParts.
