HP4040 Pressure Washer Pump – 4.0 GPM @ 4000 PSI, 1450 RPM

Part Number: HP4040
Category: Pressure Washer Pumps
Type: Belt-Drive Triplex Pump – HP4040, 4.0 GPM @ 4000 PSI

The HP4040 Pressure Washer Pump is a commercial-grade, low-RPM triplex plunger pump engineered for professional belt-drive pressure washer systems. Rated for 4.0 GPM at up to 4000 PSI and operating at a smooth 1450 RPM, this pump is built for long service life, reduced heat buildup, and consistent performance under continuous-duty conditions. Featuring a heavy-duty 24 mm solid shaft, large-capacity oil-bath crankcase, and precision internal components, the HP4040 is ideal for fleet washing, surface cleaning, and industrial wash applications where reliability and uptime are critical.

Product Specifications

• Pump Model: HP4040

• Pump Type: Triplex Plunger, Belt Drive

• Flow Rate: 4.0 GPM

• Max Pressure: 4000 PSI

• Maximum Pump Speed: 1450 RPM

• Shaft Size: 0.945″ (24 mm) Solid

• Maximum Inlet Pressure: 125 PSI

• Maximum Inlet Vacuum: 9 ft. water (7.9 in. Hg)

• Plunger Bore: 0.787″ (20 mm)

• Plunger Stroke: 0.472″ (12 mm)

• Crankcase Oil Capacity: 40.6 oz

• Maximum Fluid Temperature: 165°F

• Inlet Port Thread: 1/2–14 BSPP-F

• Discharge Port Thread: 3/8–19 BSPP-F

• Weight: 32 lb

• Dimensions: 12.2″ x 9.2″ x 6.9″

• Condition: New

Features & Benefits

• Low-RPM belt-drive design for extended pump life

• High-pressure 4000 PSI output for demanding cleaning tasks

• Triplex plunger construction for smooth, low-pulsation flow

• Heavy-duty 24 mm shaft for commercial drive systems

• Large-capacity oil-bath crankcase for improved cooling and lubrication

• Built for continuous-duty commercial and industrial operation

Applications

• Belt-driven commercial pressure washers

• Fleet wash and surface cleaning systems

• Industrial wash equipment

• Custom professional pressure washer builds and upgrades

Important Notes

• Verify shaft size (24 mm) and drive configuration before ordering

• Designed for belt-driven systems operating at 1450 RPM

• Final operating PSI and GPM depend on pulley ratio, motor, and overall system configuration