Graco DutyMax GH300 Standard Series Reservoir

DutyMax GH300 Standard Series is Graco’s electric-hydraulic powerhouse. Delivering up to 3.0 gpm (11.4 L min^-1) at 3 300 psi, it pumps block-fillers, intumescent fire-proofing and fibered roof mastics all day long. That output depends on a closed-loop hydraulic circuit: fresh ISO-46 oil leaves the Reservoir, flows through a 25-micron spin-on filter, drives the hydraulic motor, then returns for cooling. A cracked reservoir cap or a clogged filter can seize the entire system in minutes. Contractors who run lift rentals at $275 per hour or façade crews under liquidated-damage clauses know that genuine parts are the cheapest insurance on the job. That’s why they buy from SprayersAndParts.com—the only online store that stocks every fastener, seal and spin-on element in the GH300 reservoir & filter stack.

Whether you need a single Viton^® O-ring or a complete 1.5-gal powder-coated reservoir shell, you’ll find it in our live parts catalogue. Each SKU displays:

Real-time on-hand quantity—no “ships in two weeks” surprises
Cross-reference to superseded Graco numbers (useful for older fleet units)

Why Choose Genuine GH300 Reservoir & Filter Parts?

Exact Honda® GX270 tolerance match. The OEM reservoir breather is calibrated for the GX270 crankcase pulse; copy-cat caps vent too slowly, causing vacuum cavitation.
25-micron β₁₂ ≥ 200 media. Genuine Graco spin-on filters keep cylinder wear metals below 18 ppm, extending hydraulic pump life 30 % versus import filters.
RoHS & REACH compliant. Factory powder-coats emit zero VOCs; stainless seals are lead-free, meeting State DOT and aviation-facility specs.
Warranty intact. Using third-party filters voids Graco’s 2-year hydraulic warranty and Lifetime Advantage Drive^™ coverage—stay genuine, stay covered.
QR Micro-Guides. Every kit includes a scannable link to a 90-second video—perfect for verifying torque while 40 ft up on a boom lift.

Key Features & Specs

Reservoir Capacity	1.5 gal / 5.7 L ISO-46 hydraulic oil
Spin-On Filter	Part # 246173 • 25-micron absolute • bypass 15 psi
Breather Cap	IP54 vented • 125 psi pop-valve
Temperature Rating	−20 °F · +180 °F continuous
Seal Kit	248977 w/ Viton & PTFE O-rings
Material	Powder-coated 12-ga. steel reservoir • zinc-plated fittings

Cross-Fleet Compatibility—One Parts Bin, Multiple Rigs

Because Graco’s GH-Series shares common hydraulics, stocking a single filter & seal kit keeps multiple sprayers in service:

DutyMax GH230 Standard & ProContractor—identical spin-on element and reservoir gasket
GMAX 7900 Gas Airless—filter housing and bypass valve thread-match the GH300
Ultra Max II 695 ProContractor—uses the same RAC X™ guard and 60-mesh filter, handy when packing graco sprayer tips
Magnum Project Painter Plus—shares graco tip guard and inlet strainer, consolidating magnum project painter plus parts with GH300 consumables
Graco 390 PC & 495 PC—filters, guards and many O-rings interchange for trim-crew spares

Smart Accessory Bundles—Boost ROI in One Click

Hydraulic Seal + Filter Combo. 248977 seal set + 246173 filter: stop “ghost pressure” spikes and oil weep in one service call.
BlueMax II Hose Pack. 50 ft ⅜ in main + 3 ft whip dampens pulsation, extending seal life 20 %.
RAC X™ LP Tip & Guard Kit. Five fan patterns cut overspray 50 % and lower amp-draw—ideal for night shifts on generators.
Graco Gun Repair Kit. On-board cartridge rebuilds a Contractor PC gun in 90 seconds, reducing job-site carry weight.

Pro Maintenance Blueprint—Five Habits for 1 000-Hour Hydraulics

1 • Change oil every 250 hrs. ISO-46, torque drain plug 25 N·m.
2 • Replace spin-on filter at 250 hrs or sooner when delta-P lamp glows.
3 • Sample oil quarterly. Look for >18 ppm Fe; high counts = rod scoring.
4 • Torque reservoir bolts monthly. 14 N·m; loose lids suck air.
5 • Label filters by date & hours. Sharpie on the shell saves guesswork.

Add to Cart—Spray Tomorrow

Scroll the live parts list, tick your reservoir, graco filter and seal kit, then hit Add to Cart. One freight fee, one tracking link, one bullet-proof fix—see you on tomorrow’s jobsite.