24
Piston Housing Disassembly
Refer to Figure 4.6 for this disassembly, as follows:
1. Remove the large o-ring (item 1) from the housing.
2. Remove the three (3) pistons, springs, and retainers. To
do this, grasp the piston springs and pull straight out. The
retainers will stay attached to the pistons.
3. Remove the three (3) piston oil seals (item 6).
Chemical Injection System
Not all pumps are equipped with a chemical injection
system. Refer to Figure 4.7 when following this disassembly
procedure.
Be careful not to lose check ball and spring.
1. Remove the chemical injection fitting, check ball, and
spring (items 3, 4, & 5).
2. Using a large straight tip screwdriver, unscrew and
remove the chemical injection venturi and o-ring (items 1
& 2) from discharge port.
It may be necessary to insert a sheet metal screw into the
venturi hole, then pull on the screw with a pliers, to
remove the venturi and o-ring.
Section 4 • Small Frame Electric Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Item
Name
1
Chemical inject venturi (brass or plastic)
2
Venturi o-ring
3
Chemical inject fitting
4
Check ball
5
Check spring
6
Piston housing
Item
Name
1
Housing o-ring
2
Piston spring retainer
3
Piston
4
Piston spring
5
Piston housing
6
Oil seal
Figure 4.6 — Piston Housing Disassembly
Figure 4.7 — Chemical Inject System
