60
Chemical Injection System
Refer again to Figure 6.11 and follow this procedure to
disassemble the rest of the unloader mechanism and the
chemical injection system:
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. Be careful not to strip the venturi slot.
It may be necessary to use a sheet metal screw inserted in
the center hole of the venturi. Grab the screw with pliers
and pull to remove the venturi.
3. Insert a 0.25” diameter, 8” long brass rod through the
unloader spindle opening. Push out the trapped line
pressure seat, the 9/32” ball, and the rest of the unloader
components. It may be necessary to gently tap the end of
the rod with the dead blow hammer.
Thermal Bypass Actuator Removal
1. Referring to Figure 6.12, secure the pump head to a rigid
surface, taking care to not damage the milled surfaces.
2. Insert a medium-sized flat-blade screwdriver in the pump
head water passage so that its tip engages the lower lip of
the thermal actuator.
3. Pry down on the screwdriver with a constant force,
taking care to avoid severely gouging the head surface
under the screwdriver.
4. The thermal bypass actuator will slide up and out of the
pump head.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Item
Name
1
Flat blade screw driver
2
Thermal actuator
Figure 6.12 — Thermal Bypass Actuator Removal
