For contractors depending on uninterrupted performance from the Graco DutyMax EH300 HD ProContractor Series, the heart of your hydraulic system lies in its reservoir and filter components. Genuine graco paint sprayer parts designed for this system ensure mission-critical uptime. At SprayersandParts.com, we stock every part—screw, gasket, filter, tube—that goes into maintaining your hydraulic loop and fluid clean‑up.

Why Genuine Reservoir & Filter Components Matter

Prevent downtime: A clogged filter or cracked O‑ring can sideline a six-man spraying crew. With certified reservoir/filter parts, system failure is far less likely.
Maintain OEM performance specs: Spin‑on filters precisely rated (e.g. filter #246173) deliver full hydraulic flow (~11.4 L/min) at 3,300 psi. Off-brand filters often restrict flow, risking cavitation or pump overheating.
Use compatible seals: Graco’s O‑rings (PTFE/Viton) handle high temperatures and chemical exposure, protecting the MaxLife pump mechanism.
Secure warranty support: OEM parts preserve Graco warranty coverage; unauthorized substitutes could void it.

Comprehensive Inventory of Reservoir & Filter Parts

Here’s a selection of the OEM components we carry for the EH300 HD ProContractor hydraulic circuit:

Hydraulic reservoir tank (blue) – 1.5 gal capacity, with mounting fittings
Drain valve kit (245103) – allows safe, controlled fluid changeouts
Spin-on hydraulic oil filter 246173 (25 μm rating) – ensures clean oil flow
Housing and cap components – including filter cap, spring‑loaded bypass valve (125 psi), diffusion tube
Suction tube and fittings – includes o‑rings, union swivel fitting, pressure gauge
Pump‑related seals and drain valves – o‑rings part numbers: 117285, 15E599, packs, screws

Each component listing includes part numbers and specs for easy reference. A downloadable graco paint sprayer parts diagram (e.g. 334606L documentation) guides you in locating part IDs visually.

Integration with Your DutyMax EH300 HD System

The reservoir and filter parts operate within a closed-loop hydraulic setup:

Fluid flows from the tank through filter #246173, enabling clean, pressure-rated circulation.
After filtering, oil powers the displacement pump system and returns to the reservoir.
Proper functioning of these parts prevents seal erosion, pump cavitation, and loss of output.

If you ever need high-volume replacement, the graco replacement pump (Chromex/MaxLife piston lower) can be swapped quickly for fresh operation—a perfect follow-up after servicing your hydraulic circuit.

Connection to Other Graco Gear & Maintenance Practices

Use proper reservoir maintenance along with other system components: trigger guns, graco spray tips, and graco paint sprayer parts for the end-use of coating applications.
Whether you’re switching from heavy coatings to finish paint using your graco electric paint sprayer, clean hydraulic oil ensures consistent pressure to the spray tip—even on long runs.
Organization is key: maintain separate bins for reservoir/filter parts, pump kits, graco spray tips, and hoses. A graco paint sprayer parts diagram is invaluable during orders.
If you ever experience pressure loss or abnormal heat build-up, searching graco pump repair near me can connect you to certified service centers specializing in hydraulic pump and reservoir diagnostics.

System Overview & Specs at a Glance

Based on Graco documentation, key technical specs include:

Working Pressure: 3,300 psi / 227–228 bar

Flow Rate: Approx. 3.0 gpm (11.4 L/min)
Reservoir Capacity: 1.5 gal (5.7 L) of ISO‑46 hydraulic fluid
Filter Rating: 25 μm spin-on (part #246173)
Bypass Valve: 125 psi relief built into filter cap
Common O‑rings: 117285, 15E599, 154594, etc. listed in part diagrams
Compatible Models: DutyMax EH300 HD ProContractor, and similar configuration in EH230/GH300/EH230 HD models using same reservoir/filter platform

Q&A: Common Questions

Q: Can I replace just the filter and not other parts?
A: Yes—the spin-on filter (#246173) is serviceable independently. However, pairing that with clean o‑rings (like 117285 or 154594) is recommended for seal integrity.

Q: Where do I find part numbers visually?
A: The graco paint sprayer parts diagram from manuals like 334606L/J clearly show part IDs and torque specs—perfect for matching existing hardware during refurbishment.

Q: Does the reservoir/filter kit support all spray tips and flow?
A: When maintained properly, yes—it delivers full pressure and flow to any graco spray tips (e.g. RAC X tips) or graco electric paint sprayer systems powered from the same hydraulic circuit.

Why Stock OEM Reservoir & Filter Parts

Avoid unnecessary field shutdowns: A clogged filter or bad seal can take your sprayer offline. OEM parts minimize risk.
Maintain system integrity: Correct filters, seals, and fittings protect the hydraulic pump and electronics behind it.
Simplify servicing: Using graco paint sprayer parts diagram means fast part identification and ordering.
Seamless transition between toolsets: Whether you use pump kit, finish guns, or electric power options, proper maintenance ensures smooth jobsite workflow.
Trusted support: SprayersAndParts.com offers quick shipping, accurate spec lists, and guidance tied to each model's serial number.

Final Thoughts

Your DutyMax EH300 HD isn't just powerful—it’s precise. Maintaining its reservoir and filter system with genuine graco paint sprayer parts ensures your hydraulic delivery is consistent, clean, and calibrated for peak performance. Protect your pump, preserve warranty support, and reduce potential downtime by using parts like filter #246173, drain kits, o‑rings, and hardware exactly as engineered by Graco.

Pair this maintenance with periodic graco replacement pump swaps via ProConnect, proper caring of graco spray tips, and regular system flow tests to keep your rig working at spec. If you need help locating part numbers, referencing diagrams, or scheduling service using graco pump repair near me, I’m here to assist!

Graco DutyMax EH300 HD ProContractor Reservoir & Filter Parts