EZ4040E34 Triplex Pressure Washer Pump – 4.0 GPM @ 4000 PSI, 3400 RPM, 1-1/8″ Hollow Shaft

Part Number: EZ4040E34
Category: Pressure Washer Pumps
Type: Direct-Drive Triplex Pump – EZ4040E34, 4.0 GPM @ 4000 PSI (3400 RPM, 1-1/8″ Hollow Shaft, NEMA 184TC)

The EZ4040E34 Triplex Pressure Washer Pump from General Pump’s EZ Series is a high-performance, electric-duty direct-drive pump engineered for demanding professional and industrial cleaning applications. Rated for 4.0 GPM at up to 4000 PSI and designed to operate at 3400 RPM, this pump delivers exceptional cutting power with consistent flow. Its one-piece solid plunger design prevents water from entering the crankcase and protects against thermal shock and cavitation, extending service life in harsh environments. Featuring a forged brass manifold with lifetime warranty, a die-cast anodized aluminum oil-bath crankcase, and a 1-1/8″ hollow shaft flanged for NEMA 184TC motors, the EZ4040E34 provides smooth triplex operation, superior durability, and reliable high-pressure performance.

Product Specifications

Pump Model: EZ4040E34
Pump Type: Triplex Plunger, Direct Drive
Flow Rate: 4.0 GPM
Max Pressure: 4000 PSI
Rated Speed: 3400 RPM
Max Inlet Pressure: 125 PSI
Shaft Size: 1-1/8″ Hollow
Bore: 13 mm
Stroke: 13 mm
Crankcase Oil Capacity: 14 oz
Max Fluid Temperature: 165°F
Inlet Port Thread: 1/2″ – 14 BSP-F
Discharge Port Thread: 3/8″ – 19 BSP-F
Mounting: NEMA 184TC Flange
Condition: New

Features & Benefits

• Triplex plunger design for smooth, low-pulsation performance

• One-piece solid plunger construction resists thermal shock and cavitation

• Forged brass manifold with exclusive lifetime warranty

• Die-cast, anodized aluminum oil-bath crankcase

• Long-life, low-pressure seals for extended service intervals

• Oversized bearings and integrated sight glass

• Compact, space-efficient design

• More durable and serviceable than axial-style pumps

Applications

• Electric pressure washers

• Industrial and commercial cleaning systems

• Surface preparation and heavy-duty washing

• OEM replacement for compatible EZ Series units

• Equipment repair and refurbishment

Important Notes

• Verify shaft size (1-1/8″ hollow), mounting flange (NEMA 184TC), and operating speed (3400 RPM) before ordering

• Designed for direct-drive electric motor configurations

• Fill crankcase with the specified oil before operation and maintain per manufacturer guidelines

• Final operating PSI and GPM depend on motor output and overall system setup