47
3. Press three (3) inlet check valves into place, as shown in
Figure 5.16.
4. Install three (3) outlet check valves, observing their
orientation, as shown in Figure 5.16.
5. Install the three (3) M18-1.5 outlet caps and O-Rings.
6. After the head is bolted to the pump, tighten the three
(3) outlet caps to the torque value specified in the Torque
Chart, found on Figure 5.2 (Exploded View) at the
beginning of this chapter.
Main Component Assembly
Refer to Figure 5.17 for this assembly.
1. Place the pump head assembly on a flat surface, with the
inner side up.
2. Position the piston and unloader housing on the pump
head so that the pistons line up with their respective
cylinders in the pump head.
3. Place the piston housing O-Ring into the groove on the
housing.
4. Grasp the engine adapter with both hands and invert it
while holding the axial cam, washers, and bearing in place.
5. Place the engine adapter over the piston housing so that
the thrust bearing is touching all three (3) pistons, and the
mounting screw holes on the adapter line up with the
threaded holes on the housing.
6. Referring to Figure 5.18, install the three (3) M6-1.0 x 25
socket head cap screws into the mounting screw holes on
the engine adapter and thread them into the piston
housing.
7. Tighten the M6-1.0 cap screws to the torque value
specified in the Torque Chart, found on Figure 5.2
(Exploded View) at the beginning of this chapter.
NOTE:
The engine adapter bolt holes line up with
the holes on the piston housing in one position only.
Use the widest of the three openings between the
engine adapter ‘legs’ as a reference. This opening
should line up roughly with the chemical
injection/thermal relief valve side of the piston
housing.
Section 5 • Small Frame Gas Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Figure 5.18 — Installing Engine Adapter Bolts
Item Name
1
M6-1.0 x 25 cap screws & M6 lock washers
2
Engine adapter
3
Widest opening between three (3) engine adapter
‘legs’ aligns with the chemical injector-thermal
relief side of piston and unloader housing
4
Pump head
Figure 5.17 — Main Component Assembly
Item
Name
1
Engine adapter assembly with axial cam, bearings,
and washers held in place.
2
Assembled piston and unloader housing with
pistons, seals, and O-Ring
3
Pump head assembly placed on flat surface
