Chemical Inject Assembly - Briggs & Stratton CE8070 Troubleshooting Manual

Before assembly, ensure the auto switch cavity is clean and
free from scale, corrosion, dirt, etc.
1. If necessary, install new backup rings and o-rings (items 8,
10, 12, 13) to the auto start piston return stop (item 7).
2. Remove and do not replace the teflon rings on the auto
switch piston assembly. These rings should be removed
for optimum auto switch operation.
3. Install the auto switch piston return spring (item 6) in the
auto switch cavity on the piston housing.
4. Install the auto switch piston assembly, ensuring that it
engages the spring inserted in step (3.).
5. Install the auto switch piston return stop (item 9) on the
piston shaft so that the small backup ring faces out.
6. Install the retainer cap (item 11) over the piston shaft and
hand thread it into the piston housing.
7. Tighten the retainer cap to the torque value specified in
the Torque Chart, found on Figure 4.2 (Exploded View) at
the beginning of this chapter.
8. Ensure that the rubber diaphragm (item 2) is not damaged
or perforated, and is installed in the hole in the side of
the auto switch housing.
9. Using a 5.5mm socket, install two (2) Taptite screws to
secure the auto switch housing to the piston housing.
Make sure the auto switch housing is anchored at the
midpoint of its lateral adjustment.
After the pressure washer is assembled, it may be necessary
to adjust the position of the auto switch housing to ensure
proper auto switch operation.
Portable Pressure Washer Familiarization and Troubleshooting Guide

Chemical Inject Assembly

Refer to Figure 4.15 for this assembly.
Figure 4.15 — Chemical Inject System
Item
1
2
3
4
5
6
1. Install the check ball into the chemical inject fitting,
followed by the spring (with the small end of the spring
towards the ball).
2. Install the chemical inject fitting into the piston housing.
Be careful not to drop the ball and spring.
3. Tighten the chemical injection fitting to the torque value
specified in the Torque Chart, found on Figure 4.2
(Exploded View) at the beginning of this chapter.
4. Carefully install the chemical inject venturi o-ring onto the
venturi.
5. Hand thread the chemical inject venturi into the discharge
port of the piston housing.
6. Tighten the venturi to the torque value specified in the
Torque Chart, found on Figure 4.2 (Exploded View) at the
beginning of this chapter.
30
Section 4 • Small Frame Electric Pump
Name
Chemical inject venturi (brass or plastic)
Venturi o-ring
Chemical inject fitting
Check ball
Check spring
Piston housing