An automatic and essentially shock proof fire suppression system for a heavy mobile machine such as a log skidder, tractor, street sweeper or the like incorporates a set of spray nozzles piped to a tank of extinguishing fluid. A self contained battery circuit includes a plurality of thermostatic switch heat sensors and in the presence of fire a sensor closes, actuates a solenoid valve and allows CO2 gas from a CO2 capsule to flow and operate a piston device which in turn punctures a CO2 cartridge, gas from the cartridge flows and pressurizes the extinguishing tank thereby causing the extinguishing fluid to be discharged from the nozzles
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