70
Pump Head Installation
Referring to Figure 6.33, install the pump head onto the
pump spacer plate, as follows:
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.
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.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
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)
Figure 6.33 — Pump Head Installation
Figure 6.34 — Head Bolt Tightening Sequence
