Pump Head Installation

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

Pump Head Installation Referring to Figure 6.33, install the pump head onto the pump spacer plate, as follows:

Figure 6.33 — Pump Head Installation 4. Align the pump head with the pistons protruding from the spacer plate and gently press the head into place.

CAUTION: Make sure the small stem of the thermal bypass actuator does not fall out during installation of the pump head. 5.Install six (6) M8-1.25 socket head cap screws with six (6)

M8 washers. 6. Tighten the socket head screws in the order shown on

Figure 6.34 to the torque value specified in the Torque

Chart, found on Figure 6.2 (Exploded View) at the beginning of this chapter.

Figure 6.34 — Head Bolt Tightening Sequence

Item Name 1 Crankcase assembly, including pistons and thermal bypass components 2 Spacer plate 3 Head gasket 4 Check valve o-rings (3) 5 Pump head assembly, including thermal bypass stem 6 Steel washer (6) 7 M8-1.25 socket head cap screw (6)

1. Install three (3) inlet check valve o-rings over the installed check valves using a dab of petroleum jelly. 2. Set the head gasket into place on the spacer plate with its holes properly aligned with mating spacer plate holes. 3. Ensure that the thermal bypass piston is properly aligned with its seat in the spacer plate.