GOYOJO AC3

GOYOJO's water-cooled 5800 PSI machine: 350W 4-stage, dual-pointer auto-stop, external grease pot, built-in converter. A close match to the GX CS4-I.

Overview

GOYOJO's step up from its portables, and spec for spec a close match to the GX CS4-I. A 350W pump with 4-stage compression reaches 5800 PSI (40 MPa), cooled by a water tank plus a fan. Fill the tank with neutral distilled water or neutral antifreeze, never mineral water. GOYOJO recommends tanks of 6.8L or smaller and stopping after about an hour of continuous running to let it cool. The dual-pointer gauge sets two shut-off points: the compressor stops at the first, and the second is a backup (or set both to the same pressure). It has an external grease pot (one full turn after the first 6 hours, then one turn every 6 hours), an included oil/water separator with a replaceable filter dryer, and a built-in 110V-to-12V converter so it runs from the wall or a car battery. The output is an M10x1 / 8mm female fitting.

Roger's Take

Coming soon. Roger hasn't evaluated this one yet. Own it? Your review helps.

Winter Warning

Water-cooled: don't let it freeze.

Stored in an unheated garage, shop, or truck, plain water in the cooling loop can freeze and crack the water jacket, pump, or lines. Use an antifreeze mix rated for your coldest temperatures, or drain it before storage. Additives like WaterWetter and Purple Ice do not prevent freezing.

Coolant Guide

Looks familiar?

This is a close match to the GX Pump CS4-I.

Roger's take on lookalikes: many come from the same factory as GX Pump. GX is the lead brand and gets the rolling upgrades, while private-label runs can sit in inventory while the GX version quietly improves. When the specs line up this closely, he'd buy the GX.

Compare the GX Pump CS4-I