11
Bypass refers to the direction of fluid flow as the water
recirculates through the pump. Bypass occurs when the
normal flow of water through a nozzle is shut off.
Figure 2.9 depicts the pump in the bypass condition with the
engine running and the spray gun trigger released.
Figure 2.10 depicts the pump in a normal operating
condition with the engine running and the spray gun trigger
depressed.
High Pressure Hose
Generac Portable Products®
uses excellent
quality high pressure hoses appropriate for each pressure
washer model. Hose length, hose internal diameter, and
hose pressure rating are all factored into the overall design
of the pressure washer system.
Hose specification factors include: gallons per minute rating
of the pump, pressure rating of the pump, and pressure
drop over the length of the hose between the pump and the
spray gun. Additional factors may also be used.
Accessory hoses are available to lengthen the hose from its
stock length.
Generac Portable Products®
does
not recommend exceeding a total length of 100 feet
between pump and nozzle because excessive length may
adversely affect chemical injection and adequate high
pressure operation.
Spray Guns
Generac Portable Products®
uses several types
of spray guns for different model pressure washers. A
diagram of a typical spray gun with the trigger closed is seen
in Figure 2.11.
Section 2 • Pressure Washer Components
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 2.11 — Typical Spray Gun Mechanism
Item
Name
1
High pressure inlet connector
2
Spray gun body
3
Valve body
4
Valve return spring
5
Check ball
6
Check ball valve seat
7
Wand body
8
Trigger
9
Safety latch in lock position
Figure 2.10 — Normal Operating Condition
Item
Name
1
Outlet pressure water stream
2
Trapped line pressure piston shown in open
condition
3
Easy start check ball against its seat
4
Unloader spindle assembly
5
Inlet water channel
Figure 2.9 — Bypass Condition
Item
Name
1
Outlet pressure water stream
2
Trapped line pressure piston shown in closed
condition
3
Easy start check ball OFF its seat
4
Unloader piston assembly
5
Inlet water channel
