Portable Pressure Washer Familiarization and Troubleshooting Guide Section 5 • Small Frame Gas Pump
Piston & Unloader Housing Disassembly Refer to Figure 5.6 for this disassembly, as follows:
2. Remove the three (3) low pressure transfer O-Rings.
WARNING: There may be up to 75 pounds of stored energy when separating the piston and unloader housing from the engine adapter housing. Remove these bolts slowly and evenly.
Figure 5.6 - Piston & Unloader Housing
3. Apply a 6” C-clamp to hold the engine adapter and the pump head together. 4. Remove the three (3) M6-1.0 x 25 cap screws that hold the engine adapter to the piston and unloader housing, as seen in Figure 5.5. Figure 5.5 - Engine Adapter
Item
Name
1
M6-1.0 x 25 cap screw & M6 lock washer
2
Engine adapter
Item
Name
1
O-Ring
2
Piston and retainer
3
Spring
4
Thermal bypass valve or pipe plug
5
Piston and unloader housing
6
Piston oil seal
1. Remove O-Ring from housing.
5. Slowly loosen the C-clamp until spring tension is released and the components separate.
2. Remove the three (3) pistons, springs, and retainers. To do this, grasp the piston springs and pull straight out. The retainers will stay attached to the pistons. 3. Remove the three (3) piston oil seals. 4. Remove the thermal relief valve (if present). It is not necessary to remove the pipe plug, if installed in place of the thermal relief valve.
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