Check Valve Assembly

Portable Pressure Washer Familiarization and Troubleshooting Guide Section 6 • Medium Frame Pump

Check Valve Assembly Refer to Figure 6.30 for this assembly.

Figure 6.30 — Check Valve Assembly

Item Name 1 Outlet check valve port cap 2 Cap o-ring 3 Check valve 4 Check valve o-ring 5 Pump head 6 Thermal actuator stem 7 Thermal actuator

1 Lay the pump head on a flat surface so that its machined surfaces are up. 2. Press the thermal bypass actuator into its recess in the pump head.

a. Check that the actuator is fully seated. b. Make sure the small actuating stem is installed into the actuator. Petroleum jelly may be used to ensure that the actuating stem stays in place for the remainder of the assembly process. 3. Install the three (3) inlet check valves: a. Align a check valve with its bore in the pump head so that the o-ring end is up. b. Push the check valve down into the head until it seats.

The valve will be just overflush with the surrounding machined surface. c. Install the two remaining inlet check valves in the same manner. 4. Install the three (3) outlet check valves: a. Position the pump head so that the outlet check valve ports are up. b. Install an o-ring seal into the bottom of each check valve port. c. Align a check valve with the port so that the o-ring end goes in first. d. Press the check valve into the bore. e. Ensure that an o-ring is installed on an outlet port cap. f. Hand thread the cap into the port containing an installed check valve. g. Tighten the outlet port cap to the torque value specified in the Torque Chart, found on Figure 6.2 (Exploded View) at the beginning of this chapter. Note that final tightening is best performed after the pump is completely reassembled. h. Repeat steps e to g to install the two remaining outlet check valves.