Why a belt drive instead of direct drive?

The belt drive runs the pump at a lower RPM than the engine, so the pump runs cooler and lasts longer. That's why belt-drive units like this are built for daily commercial use rather than occasional jobs.

What engine and pump does this unit use?

It uses a Honda GX390 engine paired with a belt-driven General Pump. That combination is what delivers the 4000 PSI and 4.0 GPM ratings.

Does it come ready to run?

Yes. All units are completely factory assembled, tested in the USA, and delivered ready to operate.

What protects the engine and pump during operation?

A low-oil shutdown protects the engine from running with low oil, and a thermo-sensor prevents the pump from overheating when it's in bypass mode. A 50-mesh inlet filter also keeps debris out of the pump.

American Pressure SystemsSKU: B4040HG

GX390 Honda 4 GPM 4000 PSI Belt Drive General Pump Aluminum Frame Commercial

Name: GX390 Honda 4 GPM 4000 PSI Belt Drive General Pump Aluminum Frame Commercial
Brand: American Pressure Systems
SKU: B4040HG
Price: 2139 USD
Availability: InStock

4000–4999 PSI4.0–4.9 GPMHonda

$2,13900

Free shipping · typically ships in 1–3 business days

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Overview

This is a commercial cold-water pressure washer that pairs a Honda GX390 engine with a belt-driven General Pump to deliver 4000 PSI and 4.0 GPM. The belt drive turns the pump at low RPM, which runs cooler and lasts longer than a direct-drive setup, making this a good fit for contractors and daily-use cleaning where high flow and high pressure both matter. It's built on an aircraft-grade aluminum frame with dual handles and no welds to fail, carrying a lifetime frame warranty. An adjustable unloader, 50-mesh inlet filter, low-oil shutdown, and thermo-sensor round out a machine meant to run hard for years.

What's included

Honda GX390 engine with low-oil shutdown
Belt-driven General triplex pump running at low RPM for cooler operation and longer life
Aircraft-grade aluminum frame, dual handles, no welds to fail
Lifetime frame warranty
Adjustable pressure unloader
50-mesh inlet filter
Thermo-sensor prevents overheating in bypass mode
Flat-free HD tires on a 3/4" cold-rolled steel threaded axle
Easy-access single-bolt interlocking belt cover with single-bolt belt-tension adjustment
Factory assembled and tested in the USA, delivered ready to operate

Heavy Duty

Best for: driveways, concrete, paint stripping, commercial degreasing

Specifications

Pressure (PSI): 4000 to 4999
Flow (GPM): 4.0 to 4.9
Engine: Honda
Horsepower: 10 to 15
Drive: Belt
Pump: General Pump (belt drive)
Frame: Aircraft-grade aluminum, dual handles
Inlet Filter: 50 mesh
Axle: 3/4" cold-rolled steel, threaded
Tires: Flat-free HD

Frequently asked questions

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