Simpson 7108644 Use And Care Manual page 23

SHUTTING OFF THE ENGINE
Turning off the water supply to your pump with the engine running will damage the pump.
Damage caused by running the pump without water is not covered under warranty. To
avoid this hazard always turn off the engine before shutting off the water supply.
1. Set the trigger lock on the spray gun.
2. Rotate the engine switch to the OFF position.
3. Turn off the water supply.
4. Release the trigger lock then squeeze the spray
gun trigger to relieve the pressure in the hose and
pump.
5. Allow the engine to cool completely before handling and storage.
Page 21
NOTICE
PUMP DAMAGE