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Inlet Check Valves
The three (3) inlet check valves are removed from the pump
head with a standard 5/16”-18 bottoming tap.
1. As shown in Figure 6.10, gently turn the tap into the
check valve with your fingers, approximately three full
turns.
2. When securely threaded, gently rock the check valve and
withdraw it from its cavity.
CAUTION:
Do not turn the tap in too far. An
engagement of 2 or 3 threads is sufficient.
Outlet Check Valves
Referring to Figure 6.10:
1. Remove the outlet port cap.
2. Grasp the end of an outlet check valve with a needle nose
plier and pull it out.
3. Use a 90° o-ring pick to remove the o-ring from the base
of the cavity.
4. Repeat steps 2 and 3 for the remaining outlet check
valves.
Unloader Spindle Assembly
Referring to Figure 6.11:
1. Unscrew and remove the unloader handle, turning it
counterclockwise.
3. Carefully loosen and unscrew the unloader spindle
assembly with a 19mm deep socket or wrench.
Section 6 • Medium Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 6.10 - Inlet Check Valve Removal
Figure 6.11 - Unloader/Regulator and Chemical Inject Removal
Item
Name
1
Setscrew, M6-1.0 x 8mm
2
Unloader handle
3
Unloader spindle assembly
4
Spring
5
Chemical injection fitting
6
Check ball
7
Trapped line pressure seat
8
Trapped line pressure spring
9
Chemical injection venturi
10
Trapped line pressure piston
11
Unloader ball
12
Ball seat assembly
13
Pump head
14
Unloader spring
15
Plastic cap
Item
Name
1
Outlet port cap
2
Outlet port cap o-ring
3
Outlet check valve
4
O-ring
5
Pump head with tap threaded into inlet
check valve
