Chemical Inject Assembly

Portable Pressure Washer Familiarization and Troubleshooting Guide Section 4 • Small Frame Electric Pump

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 (item9) 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. Chemical Inject Assembly Refer to Figure 4.15 for this assembly.

Figure 4.15 — Chemical Inject System

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

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.