Air compressor overheating fault: in the crankshaft and bearing, cross and skateboarding, packing and the piston rod, friction, temperature in excess of the prescribed value called overheating. About the consequences of overheating: one is to speed up the abrasion between the friction pair, the second is a heat burn of the build-up of straight to friction surface and to burn to embrace the significant accident caused by the machine. The cause of bearing temperature mainly include: uneven bearing and shaft neck joint or contact area is too small; Deflection of the crankshaft bearing bending and torsion; Lubricating oil viscosity is too small, oil plug, oil pump failure off oil, etc.; When installation, no leveling, no find good clearance, spindle and motor shaft without alignment, there are two axis tilted, etc.