Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
Pump Head Installation Referring to Figure 7.41, install the pump head onto the pump spacer plate, as follows:
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.
Figure 7.41 — Pump Head Installation
Figure 7.42 — Head Bolt Tightening Sequence
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
6. Install the garden hose connector with filter screen onto the pump head.
* May not be present, depending on age of pump 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. 98
