58
Pump Head
To remove the pump head assembly, refer to Figure 6.8 and
proceed as follows:
1. Remove six (6) M8-1.25 socket head cap screws and M8
washers.
2. Remove the pump head assembly.
3. Remove the thermal actuator stem.
4. Remove the three (3) check valve o-rings.
5. Gently remove the three (3) high pressure seals with a
small flat-blade screwdriver.
6. Remove the three (3) plastic bearing rings.
7. Remove the head gasket and any remaining gasket
material from mating surfaces.
Spacer Plate
Referring to Figure 6.9, remove the spacer plate from
between the crankcase and pump head, as follows:
1. Separate the spacer plate from the crankcase, being
careful to not damage the thermal bypass spring and
piston.
2. Remove the thermal bypass piston and the thermal bypass
spring.
3. Remove the three (3) low-pressure water seals from the
spacer plate.
4. Completely remove all traces of the head gasket from the
mating surface.
5. Remove the three (3) white pilot spacers from the pump
crankcase.
6. Using a small flat-blade screwdriver, gently remove the
three (3) piston oil seals from the pump crankcase.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 6.8 — Pump Head Removal
Item
Name
1
Spacer plate assembly
2
Head gasket
3
Thermal bypass actuator and stem
4
Chemical injection fitting
5
Chemical injection check ball
6
Chemical injection spring
7
Pump head assembly
8
Steel washer
9
Socket head cap screw
Figure 6.9 - Spacer Plate Removal
Item
Name
1
Pump crankcase assembly
2
Pilot spacer
3
Spacer plate
4
Thermal bypass piston
5
Thermal bypass spring
