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Auto shut off when trigger released does not activate

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Dear rbaker2,
Auto shut off is carried out by means of a spill valve or also know as a control valve. When the gun is closed, pressure is built within the machine and within the spill valve. With the pressure the spill valve is compressed and pushes on a microswirch. When this is done the microswitch shhuts the machine down. Now your problem is caused by one of 2 faults. Either the spill valve is faulty or the micro swithch is faulty. Most machines it is the spill valve which mostis the fault. But microswitches are also delicate and also get faulty. A rare reason for your problem is that both the spill valve and the micro switch are faulty. The spill valve and the micro swith, is rarely serviceable. So I advice you change the two of them by new ones. A bit of advice do not leave the machine running with closed gun ...because this as I said builts pressure in the machine and damage is done to internal suction and delivery valves. Sometimes even the high pressure hose can burst. These results can also hurt a person. If you open the machine yourself you often locate the spill valve under a cap with a micro switch and you see a black wire attached to the cap. If you intend to use the old spill valve, this must be lubricated with special silicon grease. The job is very simple. All you have to do is open the cover and locate the spill valve.

Posted on Jun 25, 2009


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