99
Unloader-Pressure Regulator Valve
1. Install the valve spindle with o-ring seal into the bore
provided on the pump head (illustrated in Figure 7.41).
2. Install the assembled unloader-pressure regulator valve.
Retain with three (3) M6-1.00 socket head cap screws, as
shown in Figure 7.43.
3. Tighten the socket head cap screws to the torque value
specified in the Torque Chart, found on Figure 7.2
(Exploded View) at the beginning of this chapter.
Main Component Assembly
Before installing the pump onto the engine, place the engine
with its shaft in a vertical position and facing the installer.
Make sure the engine adapter has been properly installed.
Check that the axial cam drive components are installed
properly. The pump may now be installed as follows:
1. Install a new o-ring seal around the mounting flange of he
pump crankcase.
2. To aid reassembly, apply a dab of axle grease or
petroleum jelly to the piston pivot shoes, as indicated by
item 1 in Figure 7.44. This will allow the shoes to stick to
the tips of the three pistons.
3. Place the piston pivot shoes onto the tips of the three
pistons. The grease should hold the shoes in place.
Section 7 • Large Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Item
Name
1
Unloader/pressure regulator assembly
2
Washer
3
Socket head cap screw
Figure 7.44 — Piston Pivot Shoes
Figure 7.43 — Unloader-Pressure Regulator
