Piston & Unloader Housing Disassembly

Portable Pressure Washer Familiarization and Troubleshooting Guide Section 5 • Small Frame Gas Pump

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. 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 Piston & Unloader Housing Disassembly Refer to Figure 5.6 for this disassembly, as follows:

Figure 5.6 - Piston & Unloader Housing

Item Name 1 M6-1.0 x 25 cap screw & M6 lock washer 2 Engine adapter

5. Slowly loosen the C-clamp until spring tension is released and the components separate. 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. 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.