Industrial coatings contractors pushing epoxies, intumescents, and gypsum-based fireproofing rely on Graco Hydraulic DutyMax HD platform for one simple reason it never quits. The gas-powered, Honda-driven hydraulic pump produces a continuous, pulse-free flow of up to 2.75 gpm, atomizing the heaviest high-solids materials without thinning.
Why Choose Genuine Graco Hydraulic DutyMax HD Parts?
- Exact-Fit Machining: CNC-matched tolerances ensure the hydraulic piston remains concentric, maintaining full pressure at 3,300 psi all day long.
- Hydraulic Cooling Circuit: OEM seals handle the high temps generated when atomizing dense fireproofing slurries cheap copies overheat and seize.
- Convertible 3-in-1 Drive: Genuine kits let you swap a gas engine, electric motor, or hydraulic pack in under an hour, so you can spray indoors with zero exhaust.
- Warranty: Keep your factory warranty intact With Graco.
Key Technical Specifications
| Model | Max Flow | Max Tip Size (1 gun) | Engine | Best-Fit Job |
|---|---|---|---|---|
| DutyMax GH 230 HD | 2.3 gpm | .043 in | 6.5 HP Honda GX | Structural steel fireproofing |
| DutyMax GH 300 HD | 2.75 gpm | .051 in | 9.0 HP Honda GX | High-build intumescent coatings |
| GMAX II 7900 HD | 2.2 gpm | .045 in | 6.5 HP Honda GX | Heavy texture & skim coat |
Drop-In Compatibility
Hydraulic DutyMax HD pump kits, manifolds, and filters interchange across multiple Graco workhorses, streamlining your parts shelf:
- DutyMax GH 230 HD (Standard & ProContractor)
- DutyMax GH 300 HD
- TexSpray DutyMax DI convertible rigs
- GMAX II 7900 HD Standard, ProContractor & IronMan (aka “7900 Graco paint sprayer”)
- Older HydraMax II sprayers retro-fitted with HD pump kits
Performance Highlights That Sell Themselves
Hydraulic Muscle. Unlike standard electric airless paint sprayer motors that stall on 100+ KU fireproofing slurries, the DutyMax HD’s slow-stroke hydraulic piston keeps material moving even through 200-foot graco whip hose lines.
Long-Stroke Endurance Pump. A 5-inch displacement rod reduces wear by cycling 30 % slower than competitor pumps, squeezing an extra season out of every packing set.
MaxFlo 2 External Filter. Twin-layer filtration traps grit before it scores piston walls, cutting rebuild costs by up to 40 %.
ProConnect Cartridge Valve. Swap a lower in 60 seconds with just a wrench essential when you’re 60 ft up on scaffolding and the clock is ticking.
Bundle With Battle-Tested OEM Accessories
Every cart that leaves our Graco warehouse is spec’d for a full day’s spray no frantic supplier runs mid-shift:
- Graco whip hose (3/8 ¼ 250 bar) for fatigue-free maneuvering at the gun.
- Graco spray gun parts diagram print-outs in every rebuild kit because lost screws love job sites.
- Graco pump repair kits—OEM packings, balls & seals to fit the 230 & 300 HD pump bodies.
- Graco truecoat 360 parts list for touch-up crews handling edge work.
- Full line of graco accessories—5-gal hoppers, On-Board pressure gauges, XHD RAC tip guards & more.
Pro Tips for Long-Term Reliability
Log run-hours: Install the Graco BlueLink module and schedule service every 500,000 cycles.
Hot-swap packings: Keep pump repair kits vacuum-sealed until use; install new throat seal lubricant at each change-out.
Segment your inventory: Color-code bins so electric airless paint sprayer parts never mingle with hydraulic hardware one mis-matched O-ring can seize a $9,000 pump.
Use the diagram: Post the spray gun parts diagram at your wash-down station to guarantee every carbide seat goes back where it belongs.
Ready To Crush Your Next Fireproofing Bid?
Hit “Add to Cart” now to secure genuine Graco Hydraulic DutyMax HD parts. Backed by Graco’s factory warranty.