Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
LARGE FRAME PUMP This section describes the large frame pump assemblies powered by gasoline or diesel engines intended for use in heavy duty applications. This large frame pump may also be referred to as a ‘GPW’ pump. Most of the information previously printed in publication 97492 will be found here. The large frame pump has the following features: • 1500 to 3000 PSI water pressure • 2.0 to 3.0 Gallons per minute flow • Axial Cam Design • QPQ, Stainless Steel, or Ceramic Pistons • Easy Start Unloader • Adjustable Output Water Pressure • Chemical Injection System available • Brass heads (above 2200psi) • Aluminum heads (2200psi and below) • Thermal Relief Valve • Oil Bath Drive System
Part 1 - Specifications and Views This section presents the torque and performance specifications for Generac Portable Products® large frame pumps. Also presented are sectional and exploded views of this type of pump assembly. Pump Assembly Part No.
Rated Pressure+
Engine Shaft
Pump Head
Flow Rate*
Piston Material
Oil Type/ Capacity
21300A 21300B 21300D 21300E 95523A 95523B 95523C 95523D 95523E 95523F 95523G 97239A 97239B 97239C 99750A 99750G
2250 2700 2600 2900 1500 1800 1500 1500 2000 2200 2500 1600 1900 2600 2500 3000
Straight Straight Tapered Tapered Straight Straight Straight Straight Tapered Tapered Tapered Straight Straight Straight Tapered Tapered
Aluminum Brass Brass Brass Aluminum Aluminum Aluminum Aluminum Brass Brass Brass Aluminum Aluminum Brass Brass Brass
2.2 2.5 2.6 2.9 2.0 2.3 3.0 2.0 3.0 3.0 3.0 2.0 2.5 3.0 3.0 2.5
Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic
80W90/300ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml 80W90/285ml
Performance Specifications + Pressure (in pounds per square inch) is adjustable up to the unit's rated pressure. * Flow rate is given in gallons per minute. Pump assemblies are listed by part number and were current at time of publication. Other pump assemblies will become available as our product evolves. 75
