Piston & Unloader Housing Assembly; Pump Head Assembly; High Pressure Transfer O-Ring; Check Valve Assembly - Briggs & Stratton CE8070 Troubleshooting Manual

4. Install the chemical injection venturi O-Ring into the
piston and unloader housing.
5. Hand thread the M14-1.25 chemical injection venturi into
the housing.
6. Tighten the venturi to the torque value specified in the
Torque Chart, found on Figure 5.2 (Exploded View).
Piston & Unloader Housing Assembly
Refer to Figure 5.15 for this assembly.
Figure 5.15 - Piston & Unloader Housing
Item Name
1 O-Ring
2 Piston and retainer
3 Spring
4 Thermal bypass valve or pipe plug
5 Piston and unloader housing
6 Piston oil seal
1. Refer to Figure 5.15 and install the three (3) oil seals.
Press the seals into the piston and unloader housing using
a small amount of petroleum jelly.
NOTE:
Do not reuse springs color coded RED. All
piston return springs must be replaced in sets of
three (3).
Portable Pressure Washer Familiarization and Troubleshooting Guide
2. Apply a small amount of 80W90 oil to the three (3)
pistons, then install the pistons, springs, and retainers into
the piston and unloader housing. The pistons are merely
pushed into place.
3. Install the thermal relief valve (item 3).
4. Tighten the thermal relief valve (or substitute plug) to the
torque value specified in the Torque Chart, found on Figure
5.2 (Exploded View) at the beginning of this chapter.

Pump Head Assembly

Refer to Figure 5.16 for this assembly.
Figure 5.16 - Pump Head
Item
1
2
3
4
5
6
7
8
9
1. Install the three (3) low pressure transfer O-Rings. Use a
small amount of petroleum jelly to hold them in place.
2. Install the high pressure transfer O-Ring. Petroleum jelly
will help to hold it in place.
46
Section 5 • Small Frame Gas Pump
Name
Water seal
Check valve
Low pressure transfer O-Ring

High pressure transfer O-Ring

Outlet check valve cap

Outlet check valve cap O-Ring

Pipe Plug - If present, DO NOT REMOVE
M6 lock washer
M6-1.0 x 35 cap screw