Portable Pressure Washer Familiarization and Troubleshooting Guide Section 5 • Small Frame Gas Pump
3. Press three (3) inlet check valves into place, as shown in Figure 5.16.
3. Place the piston housing O-Ring into the groove on the housing.
4. Install three (3) outlet check valves, observing their orientation, as shown in Figure 5.16.
4. Grasp the engine adapter with both hands and invert it while holding the axial cam, washers, and bearing in place.
5. Install the three (3) M18-1.5 outlet caps and O-Rings.
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. 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.
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.
Main Component Assembly Refer to Figure 5.17 for this assembly.
Figure 5.18 — Installing Engine Adapter Bolts
Figure 5.17 — Main Component Assembly
Item Name
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
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
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.
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. 47
