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Stay Job-Ready with Long-Life Graco GMAX II 5900 HD Lo-Boy Series Parts
GMAX II 5900 HD Lo-Boy is the workhorse of gas-powered airless sprayers: a 3300 psi, 1.6 gpm rig that atomizes everything from block-fillers to high-solids elastomerics—yet rolls under a truck topper thanks to its low-profile frame. When that kind of output is your profit engine, down-time is simply not an option. SprayersAndParts.com stocks every OEM seal, rod, and sensor you need.
Six Reasons Pros Demand Genuine 5900 HD Components
- Chromex™ Endurance Pump. Hardened stainless rod and Vortex MaxLife™ swirl ports last 2× longer than chrome-plated aftermarket rods.
- Exact-fit machining. Seats and balls are ground to ±0.001 in, preserving the sprayer’s 3300 psi ceiling even on 150 ft hose runs.
- Warranty intact. Only genuine parts keep your pump, clutch, and Honda® engine under Graco’s 12-month coverage.
- BlueLink™ compatibility. Serialized boards sync run-hours, pressure logs, and rebuild history for data-driven maintenance scheduling.
- Higher resale value. Fleet surveys show OEM-serviced GMAX rigs fetch up to 17 % more at auction.
- Sustainability. 90 % of our cartons are curbside-recyclable, and every lithium pack ships in IATA sleeves.
Core Performance Specs at a Glance
- Max working pressure — 3300 psi / 228 bar
- Max flow rate — 1.6 gpm / 6.0 L min-¹
- Max tip size (single gun) — 0.043 in; two guns — 0.056 in
- Engine — 160 cc Honda GX OHV with Oil Alert®; 118 dB Lwa
- Hose capacity — 150 ft / 46 m BlueMax II anti-static line
- Recommended production — 100–200 gal week-¹ for 3-man crews
Cross-Platform Compatibility: Stretch Your Parts Budget
- GMAX II 7900 HD & TexSpray 7900—share clutch, pressure control board, and RAC X guards; stocking graco 7900 parts covers both rigs.
- Ultra Max II 595 & 495 PC Pro—identical pump packings and suction tube O-rings; one kit services electric and gas fleets.
- Magnum X5 / LTS 15—gun needles and 515 LP tips cross-fit; our Graco X5 and LTS 15 Diagram and Parts List maps shared components.
- Handheld sprayers (Ultra Cordless, TC Pro, TrueCoat 360)—use the same RAC X LP tip sizes, so your field kit supports both graco handheld sprayers and the 5900.
Top-Moving Replacement Categories
- Pump lowers & clutch kits. Swap a worn lower in under three minutes using ProConnect™ studs.
- RAC X spray tip guards. HandTite™ design eliminates build-up and finger burns at 3300 psi .
- Graco suction tube assemblies. Stainless 8-mesh strainer plus Viton® seals resist hot solvents.
- BlueMax II hose packs. Anti-static 3⁄8 in x 50 ft lines rated to 4000 psi.
- SmartControl™ sensors. Keep pressure fluctuations under ±1 % for perfect fan patterns.
Upgrade Productivity with OEM Accessories
Graco airless paint sprayer accessories turn the 5900 Lo-Boy into a multi-task powerhouse:
- CleanShot™ shut-off valve—kills spitting on soffits when you back-roll.
- JetRoller™ combo—spray & roll in one pass; ideal for chase walls.
- 12–36 in extensions—reach 18 ft ceilings without stilts; color-match collars with graco spray tip guards for instant ID.
- LineLazer 3400 gun kit—swap hoses and stripe parking lots without renting a dedicated striper.
Field-Tested Maintenance Roadmap
- Daily: Flush with 2 gal clean water or mineral spirits; add three drops TSL to packings.
- Every 500 gal: Replace inlet strainer and manifold filter; log hours in BlueLink.
- Every 1000 h: Install a new Endurance pump lower; torque gland nut to 50 ft-lb and record in your Graco Paint Sprayers Parts log.
- Seasonal: Winterize with Pump Armor® until green fluid appears at the gun; store above 40 °F.
Frequently Asked Questions
- Can the 5900 HD Lo-Boy power two guns?
- Yes. Install a 0.031 tip on each gun and keep pressure near 2700 psi. Follow a 60-mesh manifold filter to avoid starving the fans.
- Is the Lo-Boy weaker than the Hi-Boy?
- No—same 1.6 gpm pump and Honda GX160 engine. The Lo-Boy simply rides a lower cart for easier van loading.
- Will handheld LP tips fit my 5900 gun?
- Absolutely. RAC X LP and FFLP tips are universal across graco handheld sprayers and Contractor PC guns.
- How long does a suction tube last?
- Typically 5000 gal. Replace sooner if the 8-mesh screen dents or if you see cavitation at priming.
Boost Productivity—Order OEM 5900 HD Parts Today
Add genuine Graco GMAX II 5900 HD Lo-Boy parts—from pump kits and RAC X graco spray tip guards to graco suction tube assemblies and graco airless paint sprayer accessories—to your cart now. With cross-platform compatibility spanning Graco Paint Sprayers Parts from X5 handhelds to 7900 gas rigs, SprayersAndParts keeps your crews spraying, earning, and ahead of deadline—project after project.