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Posted on Jan 02, 2017
The spill valve is nearly always found near or under the micro-switch. If the 3.91M has its head in 2 parts....then the spill valve is incorporated with the top part of the head. In general,...machines that have the head in 2 plastic parts...the top part has the spill valve and the bottom part has the valves. Such machines it is not advisable to service the spill-valve. In these cases the whole top part is changed. This top part often contains the inlet-valve for the chemical. Care must be taken because this Chemical valve must be used again. Infact under this chemical valve you find the spill-valve unit. Then, as I said under the spill-valve unit you find the electrical micro switch. There are various other parts which are reusable when changing the upper head unit.
In other models you can change only the spill valve and not the whole head. As a rule....you always find the spill-valve where it is activating the micro switch, which stops the machine when the gun is closed. A faulty spill-valve will also result in low-pressure.
Posted on Jul 29, 2009
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