Graco GMAX II 5900 HD Lo-Boy 16X419 Pump Breakdown— OEM Parts, Upgrades & Pro Tips
16X419 Endurance Chromex™ Piston Pump is the OEM fluid section engineered for GMAX II 5900 HD Lo-Boy. Its Chromex-coated rod, hardened stainless cylinder, and V-Max Blue packings last twice as long as aftermarket copies. Combine that with Graco’s QuikAccess™ intake valve and you get lightning-fast clean-outs plus 3300 psi working pressure for thicker elastomerics, epoxies, even texture primers.The Graco King units are designed to withstand the harshest environmental conditions and easily handle the toughest protective coatings and corrosion control applications. The King simply rules in all conditions.
- 1.6 gpm max flow covers three guns at once with a 0.023 tip
- Honda GX200 200 cc engine starts on the first pull and handles dusty sites
- ProConnect™ swap drops a spare pump in under 60 seconds—no wrenches
- Vortex MaxLife™ option spins the rod for 6× longer wear on ProContractor rigs
Which Machines Does the 16X419 Pump Fit?
Direct bolt-on for these gas and electric work-horses:
- GMAX II 5900 – Standard Lo-Boy 17E829 & ProContractor 17E840
- UltraMax II 1095 & 1595 (ProContractor and IronMan Series)
- Ultimate MX II 1095/1595 Hi-Boy rigs
- Older Convertible TexSpray 5900 HD units using the same Chromex pump thread pattern
Need cross-fleet parts? The 16X419 shares RAC X™ spray guards, Easy-Out filters, and suction hose 288039 with:
- graco magnum x5 airless paint sprayer parts
- graco magnum lts 17 parts diagram
- truecoat 360 ds parts
That means a single truck stock keeps both pro gas rigs and homeowner rental units spraying—all while your purchasing team orders everything from one URL.
Key Performance-Driven Specs
- Working Pressure: 3300 psi / 227 bar (gas-powered consistency on stucco or epoxies)
- Max Flow: 1.6 gpm—sprays a 0.043 tip with ease
- Rod & Cylinder: Chromex + hardened stainless for corrosion and scratch-resistance
- Packing Stack: Long-Life V-Max™ Blue, UHMWPE & leather combo for dry-run protection
- Intake Valve: Tool-free QuikAccess™ unclogs in seconds
- Dry Weight (pump only): 4.0 lb—one-hand lift
Shop-Floor Hacks for Decades of Service
- Track hours, not months. Repack at 750–1 000 spray hours; log changes in your magnum lts 17 paint sprayer manual for warranty proof.
- Carry a spare pump. A second 16X419 swaps in faster than mixing the next five-gallon pail – uptime equals revenue.
- Use TSL daily. One eye-dropper of Graco Throat Seal Lubricant guards V-Max packings from dry-spray heat.
- Color-code bins. Red = graco pump repair kits; blue = graco spray texture machine consumables so night shift grabs the right bag first time.
Bundle Crew Favorites and Slash Freight
- 17H839 QuikPak Pump Repair Kit – cartridge rebuild in under 20 minutes
- 24M725 Ceramic Check Valve – solvent & waterborne compatibility for texture rigs
- RAC X™ Blue Guard 246215 – universal 7/8-G thread fits 5900, Magnum X5, LTS 17 and RTX guns
- 288039 Suction Hose – common to GMAX II 5900 and Magnum consumer sprayers for lighter truck stock
- Easy-Out™ filter core 60-mesh – swap without tools, keeps tip clogs away on 10-mil block-fillers
Same-Day Ship
In stock Qualified Orders placed and confirmed before 12 and your box rolls out of Graco warehouse the same day.
Ready to Crush Tomorrow’s Production Goals?
Add Graco GMAX II 5900 HD Lo-Boy 16X419 Pump or any graco accessories to your cart now and feel the difference when your crew fires the first coat. One click. One shipment. Zero downtime.