Makita MAC700 Owners Manual - Page 14

TROUBLESHOOTING GUIDE PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, UNPLUG THE COMPRESSOR AND BLEED OFF TANK AIR PRESSURE. PROBLEM CAUSE Excessive tank pressure safety valve pops off. Defective pressure switch. Improper wiring. CORRECTION • Move the pressure switch lever to the "OFF" position. If the unit doesn't shut off, unplug. If the electrical contacts are welded together, replace the pressure switch. • If the contacts are good, check to see if the pin in the pressure release valve is stuck. If it does not move freely, replace the valve. • Adjust or replace pressure switch. Air leaks at Fittings are fittings. not tight enough. Tighten fittings where air can be heard escaping. Check fittings with a soap and water solution. DO NOT OVER TIGHTEN. Air leaks at or inside check valve. Defective or dirty check valve. A defective check valve results in a constant air leak at the pressure release valve where there is a pressure in the tank and the compressor is shut off. Remove and clean or replace check valve. DO NOT OVER TIGHTEN. Air leaks at pressure switch unloader valve. Defective pressure switch unloader valve, or defective check valve. Contact a trained service technician. Air leaks in air tank or at air tank welds. Defective air tank. Air tank must be replaced. Do not repair the leak. WARNING DO NOT DRILL INTO, WELD OR OTHERWISE MODIFY AIR TANK OR IT WILL WEAKEN. THE TANK CAN RUPTURE OR EXPLODE. Air leaks between head and valve plate. Page 14 Blown head Replace gasket or contact Authorized gasket. Service Technician.