CAT 66PPX40GG1 Pressure Washer Pump – 4.0 GPM @ 4200 PSI, 3400 RPM

Part Number: 66PPX40GG1
Category: Pressure Washer Pumps
Type: Gas Direct-Drive Pump – CAT 66PPX40GG1, 4.0 GPM @ 4200 PSI

The CAT 66PPX40GG1 Pressure Washer Pump is a heavy-duty direct-drive pump engineered for gas-powered pressure washers operating at 3400 RPM. Delivering an impressive 4.0 GPM at up to 4200 PSI, this pump is built for demanding residential and commercial applications that require both high flow and extreme cutting power. Featuring a 1″ solid shaft and CAT’s proven triplex plunger design, it provides smooth output, exceptional durability, and long service life under continuous high-load use.

Manufactured by CAT Pumps, the 66PPX40GG1 is designed for high-performance portable and cart-mounted pressure washer systems where reliability and output matter most.

Product Specifications

• Pump Model: 66PPX40GG1

• Manufacturer: CAT Pumps

• Pump Type: Triplex Plunger, Direct Drive (Gas)

• Flow Rate: 4.0 GPM

• Max Pressure: 4200 PSI

• Rated Speed: 3400 RPM

• Shaft Size: 1″ Solid

• Bore Diameter: 14 mm

• Stroke: 11.4 mm

• Weight: 24 lb

• Condition: New

Features & Benefits

• Genuine CAT Pumps construction for commercial-grade reliability

• High-output 4.0 GPM / 4200 PSI performance

• Designed for high-speed 3400 RPM gas engines

• Triplex plunger design for smooth, low-pulsation operation

• Heavy-duty internal components for extended service life

• Ideal for powerful portable and cart-mounted washer builds

Applications

• Gas-powered pressure washers

• Residential and commercial-grade cleaning equipment

• Replacement pump for compatible direct-drive systems

• Heavy-duty portable pressure washer setups

Important Notes

• Verify shaft size (1″) and engine RPM compatibility (3400) before ordering

• Designed for direct-drive gas engines

• Final operating PSI and GPM depend on engine speed and overall system configuration