My bostitch 6.0 gal OL195 air compressor won't start at all, it has voltage everywhere it should
On/Off switch works and there is voltage to the motor, the unit was running and then when it filled up it will not start again and there is no air in the tank at all. I think the drain cock was slightly open so maybe the compressor kept running while I was at lunch. The thermo overload seems to be Ok also, need a little help troubleshooting the problem. Thx Jim
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is it building up any pressure on the gauge
if the pressure recorded is around 40 psi or less , replace the failed poppet/reed valves in the compressor head
if it goes to 100 psi then replace the automatic controller for the motor
Some Bostitch compessors are very unique in that they intake air from below the piston. If you cannot find an air filter, then your compessor has reed valve built into the piston that may cause problems. If you have an air filter on the head of the pump, then you have reed valves in the head. When the reed valves fail, there will be very little or no air pressure. Second problem with all compressors is the in-tank check valve. This valve allows air to enter the tank and not back-out into the compressor. Easy to check. Add air into tank with another compressor thru the quick connect and listen for air leaking around the head or pressure switch. If no leaks and pressure holds in the tank then valve ok. Examine the condition of the cylinder and piston ring by rotating the crank by hand so that the piston is at top of cylinder. Look for scratches around upper part of cylinder wall. If scratches, then replace cylinder and piston ring. If top of cylinder looks good, then suspect reed valves. Good luck
Something is wrong with your "unloader" I should think. That is the device that removes the pressure from the cylinder so the machine does not have to start up against its full air pressure There will be a narrow air pipe connecting the compressor to the switch assembly which bleeds off the air when the power is off. That hiss you get when you turn it off or it turns itself off. I think you will find a leak there or possibly the non return valve that stops all the air escaping when the unloader valve is open has failed or got a foreign body stuck in its seating.