67
Spacer Plate
1. Install the three (3) low pressure seals into the bores
provided in the spacer plate. Make sure the seal’s groove
side is inserted into the spacer plate bore, as shown in
Figure 6.28.
2. Align the mounting holes in the spacer plate with the
threaded holes in the pump crankcase. Align the low
pressure seal bores of the spacer plate with the pistons
protruding from the crankcase. And align the thermal
bypass piston with its seat on the spacer plate.
With all components aligned, push down on the spacer
plate. The pilot spacers should engage the low pressure seal
bores of the spacer plate.
3. Ensure that the thermal bypass piston remains aligned
with its mating seat on the spacer plate.
High Pressure Seal Assembly
Refer to Figure 6.29 for this assembly.
1. Insert a bearing ring into each of the head’s piston
cylinders, small end first. Ensure that the ring is fully
seated on its boss.
2. Pre-lubricate the three (3) high pressure seals with
silicone spray.
3. Insert a seal in each piston cylinder so that the groove
side goes in first. A properly inserted seal has its flat side
out and nearly flush with the machined head surface.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Item
Name
1
Low pressure seal
2
Spacer plate
Item
Name
1
High pressure seal
2
Bearing ring
3
Pump head
Figure 6.28 — Low Pressure Seal Orientation
Figure 6.29 — High Pressure Seal Assembly
