General Pump EZ4040G Made Ready 1" Shaft 4GPM 4000PSI - 6163

High-Pressure Cleaning Power, Ready to Bolt On

The General Pump EZ4040G Pump Made Ready is a fully plumbed, direct-drive triplex plunger pump that arrives pre-configured with an unloader, thermal relief valve, inlet filter, and quick-connect fittings - so you can remove your old pump, slide this one onto your engine shaft, set your working pressure, and get back to work. The General Pump EZ4040G is a heavy-duty triplex plunger pump engineered for gas-powered pressure washers, and the "made ready" configuration eliminates the parts hunting and guesswork that come with bare pump replacements.

Why You'll Love the EZ4040G Pump Made Ready

• Fast, Low-Hassle Replacement – The made-ready configuration arrives pre-plumbed with the VRT3-310EZ unloader, inlet filter, and thermal relief valve already installed. Users report easy installation in about 10 minutes - you bolt it to the engine, connect your water supply and high-pressure hose, set your pressure, and start cleaning. No sourcing separate valves, fittings, or adapters needed.

• Professional Cleaning Performance – With 4.0 GPM at up to 4000 PSI, this pump delivers the flow and pressure needed for heavy duty cleaning: house washing, fleet cleaning, concrete restoration, and industrial surfaces. The triplex plunger design ensures efficient, consistent water flow with minimal pulsation.

• Improved Reliability vs. Stock Pumps – The EZ4040G features a forged brass manifold with a lifetime warranty, solid ceramic plungers that resist wear and scoring, stainless steel inlet and discharge valves for clean seating and corrosion resistance, and heavy-duty roller bearings for smooth crankcase operation. These materials add years of life compared to consumer-grade alternatives.

• Built-In Protection Features – The pressure-actuated unloader, easy-start valve, and thermal relief valve work together to reduce pump stress, prevent heat damage during bypass, and eliminate hard starting. These features are included - not aftermarket add-ons.

• Upgrade Path Without Replacing the Whole Machine – If your engine and frame are still solid but your old pump has given out, replacing it with the EZ4040G made-ready assembly lets you step up to commercial-grade performance without buying a new machine. It extends the life of equipment you already own.

What Makes This EZ4040G Made-Ready Setup Different

Many replacement pumps ship "bare," requiring you to find and install separate unloaders, fittings, and bypass plumbing. The General Pump EZ4040G Pump Made Ready arrives pre-configured and ready for immediate installation.

• Fully Plumbed, Not Bare – The pump comes with the VRT3-310EZ unloader/regulator installed, an inlet filter to protect internal components, a thermal relief valve plumbed into the bypass circuit, and quick-connect fittings on the outlet. You won't need to track down individual parts or guess at thread sizes and adapter configurations.

• Engineered for Common 8–13 HP Gas Engines – The pump fits gas engines up to 13 HP with a standard horizontal shaft, making it a straightforward upgrade for many contractor-grade 4 GPM / 4000 PSI machines. The 1" hollow shaft and SAE J609B gas flange match the most common engine mounting configurations.

• Bypass-Friendly Unloader Design – The pressure-actuated VRT3-310EZ unloader allows water bypass back to the pump inlet when the trigger gun is released, so you don't need to constantly hold the trigger during longer jobs. That said, extended bypass should still be limited to avoid overheating - this is a protection feature, not an invitation to idle indefinitely.

• Thermal Protection Built In – The included thermal relief valve opens automatically if bypass water overheats, pulling in fresh, cooler supply water to protect seals and plungers. Many generic replacement pumps don't come with this valve pre-installed, leaving users to source and plumb it themselves.

• Field-Proven Series 44 Platform – The EZ4040G is part of General Pump's Series 44 line, widely used in commercial pressure washers and recognized for durability in real job-site conditions. The pump is suitable for commercial pressure washing applications where reliability and uptime matter most.

How the EZ4040G Pump Made Ready Works

1. Engine Drives the Direct-Drive Pump The 1" hollow shaft slides directly onto the gas engine's output shaft, spinning the crankcase at up to around 3400 RPM. This direct-drive arrangement provides compact, efficient power transfer with no belts or pulleys to maintain.

2. Triplex Plungers Pressurize Incoming Water Three ceramic-coated plungers move back and forth inside the forged brass manifold, drawing water in through the inlet filter and forcing it under high pressure through stainless steel discharge valves. The General Pump EZ4040G uses a triplex plunger design for efficient water flow, producing a smoother, more consistent output than single- or dual-piston pumps.

3. Unloader Controls Pressure and Bypass The VRT3-310EZ unloader regulates working pressure at the outlet. When you release the spray gun trigger, the unloader shifts flow into bypass, circulating water back to the pump inlet instead of building dangerous pressure in a closed line.

4. Thermal Valve Protects from Overheating During extended bypass, recirculating water absorbs heat from the pump head. The thermal relief valve monitors water temperature and opens automatically to release hot water and draw in fresh, cooler supply - protecting internal seals and plungers from heat damage. The maximum fluid temperature for the EZ4040G is 165°F.

5. Consistent High-Pressure Output at the Gun Pressurized water travels through the high-pressure hose to the spray gun and nozzle, delivering a focused jet or fan pattern for cleaning. The 4.0 GPM flow rate ensures strong rinse performance and effective chemical carry across large surfaces.

EZ4040G Pump Made Ready: Key Product Details

Performance & Ratings

• Maximum pressure: 4000 PSI

• Maximum flow rate: 4.0 GPM

• Maximum pump speed: 3400 RPM

• Maximum inlet water temperature: 165°F (74°C)

• Maximum inlet pressure: 125 PSI

Mechanical & Connection Specs

• Shaft type: 1" hollow shaft for direct mounting on horizontal-shaft gas engines

• Pump style: direct-drive, triplex plunger pump (three-plunger design for smooth output)

• Outlet ports: dual 3/8" BSPP-F ports, pre-configured with quick-connect fittings in the made-ready assembly

• Inlet port: large water inlet with filter/strainer installed to protect internal components

• Bore & stroke: approximately 13 mm each (~0.512")

Included Components in the Made-Ready Assembly

• General Pump EZ4040G Series 44 pump body - the pump ships with crankcase oil already included (crankcase oil capacity: 14 oz)

• VRT3-310EZ pressure-actuated unloader/regulator with easy-start valve installed

• Thermal relief valve plumbed into the bypass circuit

• Water inlet fitting with filter/strainer and appropriate connectors

• Quick-connect fittings on outlet for fast hose hookup

Frequently Asked Questions About the General Pump EZ4040G Pump Made Ready

These FAQs address the most common questions around the EZ4040G made-ready assembly.

Can the EZ4040G pump be bypassed when the trigger is released?

Yes. It includes a VRT3-310EZ unloader and thermal relief valve, and the unloader allows bypass by sending water back to the pump inlet when the gun is closed. However, bypass should not be used for long idle periods. Prolonged bypass can overheat water and shorten pump life even with the relief valve in place.

What engines will the EZ4040G made-ready pump fit?

The pump is compatible with engines up to 13 HP - specifically, common horizontal-shaft gas engines with a 1" shaft, often found on 4 GPM / 4000 PSI pressure washer frames. Always verify shaft size, mounting bolt pattern, and RPM range before ordering to ensure a proper match.

Is the pump difficult to install if I've never changed one before?

Most mechanically inclined users find it easy because the made-ready unit comes pre-plumbed and preconfigured. Users report easy installation in about 10 minutes. If you're unsure about shaft alignment or unloader adjustment, a service shop or experienced technician can handle it quickly.

Can I use hot water with the EZ4040G?

The pump is rated for inlet water up to about 165°F (74°C). Read the pump documentation to confirm exact limits for your configuration. The EZ4040G is typically used on cold- or warm-water washers, not as part of a true high-temperature boiler system.

How often should I change the pump oil?

Change oil after the initial break-in period (first several dozen hours of use), then at regular intervals based on manufacturer guidance and your duty cycle. Check oil condition periodically - milky or discolored oil indicates water intrusion and the need for immediate service. The crankcase oil capacity is 14 oz.

Is this a good upgrade from my stock 4 GPM 4000 PSI pump?

Many users move to the General Pump EZ4040G made-ready when OEM pumps fail, drawn by the Series 44 platform's reputation for durability and the complete, ready-to-install configuration. Before making the change, ensure that your frame, engine, and accessories (hoses, guns, wands) are rated for the pump's maximum pressure and flow. Read reviews from other contractors to see how the pump performs in real-world conditions close to yours.

Ready to Refresh Your Pressure Washer?

Stop nursing a failing OEM pump that costs you time and jobs. The General Pump EZ4040G Pump Made Ready is a pre-plumbed, commercial-grade assembly that restores - or upgrades - your 4 GPM / 4000 PSI pressure washer with minimal downtime. It has a maximum pressure of 4000 PSI, the flow to handle heavy duty cleaning, and the Series 44 durability to keep working season after season.