DOES IT BUZZ WHEN THE TANK IS AT ZERO PSI? IF THERE IS PRESSURE IN THE TANK THEN IS THE COMPRESSOR UNLOADING WHEN IT CUTS OFF - STARTING UNDER A LOAD? YOU COULD HAVE A BAD SPOT IN THE MOTOR. YOU CAN TURN THE FLYWHEEL A LITTLE (1ST TURN IT OFF!) AND THEN TRY IT TO SEE IF THERE IS A BAD SPOT IT COULD LAND ON SOMETIMES.YOU COULD ALSO HAVE BURNT POINTS IN THE MAGNETIC STARTER CAUSING A BAD CONNECTION. YOU CAN JUMP THE STARTER BY CONNECTING THE WIRES STRAIGHT THRU BUT BEWARE YOUR PRESSURE SWITCH WILL NOT CUT IT OFF NOW! IT IS JUST TO TEST IT.
YOU MAY HAVE A WEAK LEG OF CURRENT FROM YOUR POWER COMPANY. PUT AN AMP CLAMP AROUND EACH MOTOR WIRE AND CHECK AMP DRAW WHILE COMPRESSOR IS TRYING TO START. IT SHOULD BE PULLING ABOUT 3 TIMES THE AMPS DURING STARTUP - 80-90 AMPS? SEE IF YOUR METER DROPS TO ZERO. HOPE THIS HELPS, JODY
THERE ARE COUNTER WEIGHTS INSIDE THE CONE THAT PUSH A SMALL TIRE STEM TO UNLOAD THE COMPRESSOR THRU A SMALL HOLE IN THE 90 DEGREE FITTING. THIS ONLY APPLIES IF THE UNIT HAS AIR IN THE TANK WHEN THE PROBLEM OCCURS.
ITS ALWAYS THE MOST EXPENSIVE FIX ISNT IT. YOU MOST LIKELY HAVE A 705 PUMP. IF SO YOU CAN EASILY INSTALL A 5 HP MOTOR. I THINK SAYLOR BEALL MADE A 703, IF SO I WOULD KEEP IT 3 HP. YOU WILL NEED TO CHANGE THE PULLEY DIAMETER AND THEREFORE THE BELTS TOO. IF YOU USE THE SAME PULLEY YOU WILL BE TURNING TOO MANY RPMS. ANOTHER THING TO WATCH OUT FOR IS WIRE SIZE. YOUR NEWER 5 HP MAY REQUIRE LARGER GAUGE WIRE. I LIKE LEESON AND BALDOR MOTORS BUT SAYLOR BEALL TENDS TO HAVE MORE DRAG THAN OTHER NAME BRANDS AND DRAWS MORE AMPS. WE LIKE TO USE A LARGER CAST IRON MOTOR LIKE A WEG OR SIMILIAR ON S.B. DUE TO THIS. MAKE SURE YOU GET 1750 RPM AND NOT 3600. DONT USE A 230 VOLT MOTOR ON A 208 VOLT CIRCUIT. DO NOT USE ANYTHING REBUILT. MOTOR SHOULD BE AROUND $ 450 - 500.00 HOPE THIS HELPS. JODY
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I would like to add that the pump does turn freely so I know its not locked up.
Thanks Jody, Yes this happens with zero pressure in tank, I have about decided the motor is shot because the starter switch has been tested good. I did roll the motor by hand and got it to start just once. My power supply is strong as I have other 220v equipment that runs fine. I'm thinkin' of replacing the motor with a 5hp. Any brands stand out as dependable?
Thanks again for your ideas. Mike
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