Description
IMPORTANT: Some engines have longer output shafts and may require the optional 1/4″ gearbox spacers for proper installation. Predator engines are the most common example. If your engine has a longer shaft, please add the gearbox spacer kit available on this page.
*The flange should be flush to engine when fully seated to avoid damage while tightening bolts. If not flush when fully seated on shaft, then spacers are required.
The CT 4066 GB is one of our premium 22 mm plunger pumps. Physically larger than our 15 mm & 18mm plunger pumps of similar pressure, these are our direct-drive gas pumps with the highest flow rate, suited for the most demanding high flow applications.
Detachable unloader valves make replacements and upgrades a cinch. Choose the standalone pump or add a premium extended bypass unloader kit designed to keep water cooler longer so you can safely run your pressure washer in bypass mode for longer periods.
Gearbox Drive for Extended Durability
This pump features a gearbox drive system, which reduces operating speed significantly compared to direct drive pumps. While direct drive units typically run at around 3400 rpm, gearbox-driven pumps operate at much lower speeds — often between 1500 and 1750 rpm depending on the configuration. This slower operation reduces wear and heat, resulting in longer pump life and making it ideal for commercial and continuous-use applications.
- Model: CT 4066 GB
- Pressure: 4000 psi (275 bar)
- Flow rate: 6.61 US gpm (25.0 L/min)
- Power: 22 hp
- RPM: Gearbox Reduction 3400–1560
- Pump mechanism: Triplex plunger
- Pump inlet: ½″ NPT F
- Pump outlet: ⅜" NPT F
- Unloader inlet: ¾″ standard garden hose
- Unloader outlet: Quick-connect
- Includes: Operating manual with spare parts list
- Oil grade: SAE 15W-40 oil
- Compatibility: Standard SAE J609 mounting flange for up to 22 hp direct-drive gasoline engines with 1″ horizontal shafts. The pump can run on a 13 hp engine when turned down to 2450 rpm.
Options
- No unloader valve (standalone pump): Select your own external unloader valve for easy maintenance and future upgrades.
- Premium unloader kit: Detachable (bolt-on) Italian-made unloader valve by PA SpA with extended bypass; pressure-adjustable with built-in water filter (no detergent injector)
