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Portable Pressure Washer Familiarization and Troubleshooting Guide
Section 6 • Medium Frame Pump
High Pressure Outlet and Chemical Injection
Assembly
Refer to Figure 6.31 for this assembly.
Figure 6.31 — High Pressure Outlet and Chemical Injection
Item
Name
1
Chemical injection fitting
2
Check ball
3
Spring
4
Ball seat assembly
5
Unloader ball
6
Trapped line pressure seat
7
Trapped line pressure piston assembly
8
Spring
9
Venturi assembly
10
Head assembly
1. Install the check ball into the chemical injection fitting,
followed by the spring (with the small end of the spring
towards the ball).
2. Install the chemical injection fitting into the pump head.
Be careful not to drop the ball and spring.
3. Tighten the chemical injection nipple to the torque value
specified in the Torque Chart, found on Figure 6.2
(Exploded View) at the beginning of this chapter.
4. Lightly coat the high pressure port components with
silicone spray.
5. Insert the following components into the pump head in
the order listed (refer to Figure 6.31):
a. Ball seat assembly, o-ring end first.
b. Stainless steel ball.
c. Trapped line pressure seat, slotted end first.
d. Trapped pressure piston assembly, o-ring end first.
e. Trapped pressure return spring
6. Ensure that an o-ring is installed on the chemical injection
venturi.
7. Insert and hand thread the chemical injection venturi into
the head.
8. Carefully tighten the venturi to the torque value specified
in the Torque Chart, found on Figure 6.2 (Exploded View)
at the beginning of this chapter. Avoid stripping out the
slot.
Unloader Spindle Assembly
Refer to Figure 6.32 for this assembly.
Figure 6.32 — Unloader Spindle Assembly
Item
Name
1
Plastic cap
2
Setscrew, M6-1.0 x 8mm
3
Unloader handle
4
Spring
5
Unloader spindle assembly
6
Head assembly
1. Lightly coat the unloader spindle threads and o-rings with
silicone spray.
2. Insert the spindle into the bore provided on the pump
head and hand start the threads.
3. Tighten the spindle assembly to the torque value specified
in the Torque Chart, found on Figure 6.2 (Exploded
View). The unloader spindle assembly is preset at the
factory and does not need adjustment.
69
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Troubleshooting
