Portable Pressure Washer Familiarization and Troubleshooting Guide Section 6 • Medium Frame Pump
MEDIUM FRAME PUMP This section describes the medium frame pump assemblies powered by gasoline engines. This medium frame pump may also be referred to as ‘GPW-FH’ or ‘flat head’ pumps. The medium frame pump has the following features: • 1800 to 2250 PSI water pressure • 2.0 to 2.5 Gallons per minute flow • Axial Cam Design • Ceramic Pistons • Easy Start Unloader • Adjustable Output Water Pressure • Chemical Injection System available • Thermal Bypass Valve available • Oil Bath Drive System • Vertical and Horizontal Engine Mount
Part 1 - Specifications and Views This section presents the performance specifications for Generac Portable Products® medium frame pumps. Also presented are sectional and exploded views of this type of pump assembly. A table listing torque specifications may be found on the exploded view page. Pump Assembly Part No.‡
Rated Pressure+
Flow Rate*
Unit Style
Engine Shaft
Pump Head
Piston Material
Oil Type/ Capacity
A1803 A1803A A1803C A1803C B3166 B3166A B3166C B3166C B3358 B3358 B3358A B3358C B3358D
2250 2000 2200 2200 2250 2000 2000 2000 2250 2250 2000 2200 2000
2.222 2.0 2.2 2.2 2.222 2.0 2.2 2.2 2.222 2.5 2.0 2.2 2.2
Horizontal Vertical Vertical Horizontal Horizontal Vertical Vertical Horizontal Vertical Horizontal Vertical Vertical Horizontal
Straight Straight Straight Straight Straight Straight Straight Straight Straight Straight Straight Straight Straight
Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum
Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic
80w90 280ml 80w90 305ml 80w90 305ml 80w90 280ml 80w90 280ml 80w90 305ml 80w90 305ml 80w90 280ml 80w90 305ml 80w90 280ml 80w90 305ml 80w90 305ml 80w90 280ml
Performance Specifications ‡ Pump assemblies are listed by part number and were current at time of publication. Other pump assemblies will be added as our product line evolves. + Rated Pressure is given in pounds per square inch. * Flow Rate is given in gallons per minute.
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