42
Chemical Injection System
Refer to Figure 5.7 and follow this chemical injection system
disassembly procedure.
CAUTION:
Be careful not to lose check ball and
spring.
1. Remove the chemical injection fitting, check ball, and
spring.
2. Using a large straight tip screwdriver, unscrew and
remove the chemical injection venturi and O-Ring from
discharge port.
Unloader
Refer to Figure 5.8 when following this disassembly
procedure.
CAUTION:
Unloader cap is under strong spring
pressure.
1. Remove the M25-1.0 unloader cap with a 24mm wrench.
NOTE:
Unloader cap, unloader spring, and
unloader piston parts may show some slight
differences depending on production date. If the
entire unloader system is replaced, newer assemblies
are completely interchangeable with older models.
2. Remove the unloader spring and the unloader piston.
These pieces should just slide out.
3. Remove the unloader seat by inserting a 90° O-Ring pick
into the orifice machined in the side of the seat, then
gently pull the seat out of the housing.
Section 5 • Small Frame Gas Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Item
Name
1
Piston and unloader housing
2
O-Ring
3
Unloader seat
4
Unloader piston
5
Unloader cap
6
Unloader spring
7
Split-ring seal
Figure 5.7 - Chemical Injection System
Item
Name
1
Chemical injection venturi
2
O-Ring
3
Barbed nipple
4
Check ball
5
Spring
6
Piston and unloader housing
Figure 5.8 - Unloader Parts
