What Causes the Car Washing Pump to Overheat?
Overheating of a car washing pump is caused by the pump being in bypass for too long. Bypass is the state that the washer pump is in when the trigger is not pushed in or dejected. In simpler terms, overheating is caused by leaving the pump on when you aren’t using it. Most manufacturers recommend not leaving the machine ideal for more than a few minutes. However, after one minute in the bypass state the pressure washer pump is already really hot and can begin to cause damage once you begin to use it again. As a general rule, you should turn the machine off if you are going to leave it in the bypass state for more than 45 seconds. Always make sure to turn the machine off before you walk away from it, even if you are only going to be gone for a few minutes. You never know what might catch your attention while you are away from pump.
What happens if the machine is left on, too long?  If you switch on the trigger after the machine is in bypass for too long, cold water from the water supply will reach the hot pistons and could cause the pistons to crack. If the machine overheats, it not only causes irreparable damage to the pump, but it can cause substantial damage to the entire car washer.