TM 9-4940-495-14&P
III. TROUBLESHOOTING
Should blasting become spasmodic or cease, close and open choke air valve (10). If this fails, then there is
plugging of abrasive metering valve (9) or the nozzle.
Shutdown and inspect valve through clean-out plug or remove nozzle and inspect. To obtain the most effective
blasting mixture, open abrasive metering valve (9) until sand is barely visible in the blast pattern.
WARNING
TO AVOID INJURY, CARE MUST BE EXERCISED THAT THE NOZZLE
BE HELD IN BLASTING POSITION BEFORE PRESSURIZING.
IV. DISASSEMBLY AND REPAIR INSTRUCTIONS
Only pipe and crescent wrench tools are required to repair and replace valves. The movement of sand in, through
and near valves causes extreme wear due to abrasive nature. Simple disassembly, cleaning and occasional replacement
of parts showing visible wear will make all valves reuseable.
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