98
Pump Head Installation
Referring to Figure 7.41, install the pump head onto the
pump spacer plate, as follows:
1. If equipped, check that three (3) inlet check valve seat
supports are properly installed into the bores provided on
the spacer plate.
2. Set the head gasket into place on the spacer plate with its
holes properly aligned with mating spacer plate holes.
3. Align the pump head with high and low pressure bores of
the spacer plate and set 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.
4. Install six (6) M8-1.25 socket head cap screws with six (6)
M8 ribbed lock washers to retain the head.
5. Tighten the socket head screws in the order shown on
Figure 7.42 to the torque value specified in the Torque
Chart, found on Figure 7.2 (Exploded View) at the
beginning of this chapter.
6. Install the garden hose connector with filter screen onto
the pump head.
Section 7 • Large Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 7.41 — Pump Head Installation
Item
Name
1
Spacer plate
2
Head gasket
3
Thermal bypass actuator
4
Pump head
5
Lock washer
6
Socket head cap screw
7*
O-ring
8*
Unloader valve spindle seat
9
Inlet water connector/filter
* May not be present, depending on age of pump
Figure 7.42 — Head Bolt Tightening Sequence
