20 Most Recent Craftsman 33 gal Air Compressor 6 hp Horizontal k Oil Free Pump Questions & Answers

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Hi, I need a manual for Sandborn B165B500-25 air compressor too. Did you have any luck finding one?

the start capacitor on the motor body is weak,the motor needs this component to over come the air pressure when cycling to re-build the low air pressure,change both the start and run capacitors when doing the start because the other run capacitor is just as old and it will soon fail

Sounds like part #27 is worn. Replace # 24 24 A 24 B and 24. the cylinder may be worn. Perhaps depending on the age and time and labor replace with new comp. maybe Dewalt.

Check the circuit feeding power to the compressor. These conductors may be too small. Conductors have a degree of resistance. Resistance consumes power. The power conductors consume is dissipated as heat and present a voltage drop to the equipment being served. Length and size of the conductors determine power loss. An electric motor momentarily needs up to six times the running power and this power loss is squared ( PxP) at start up. The bottom line: Shorten the length of the conductors or increase the conductor size to avoid voltage drop.

Some of the craftsmen compressors have pistons that are coated on the top of the dome. Once the coating wears off, they have severe loud piston slap. If you continue to run it the way it is, it will snap the connecting rod in half or break the piston and possibly the cylinder.

most likly the regulator is no good, some can be serviced, some are sealed units.

Some pressure switches have a valve that reliefs the compressor head pressure when the motor stops and closes the head pressure relief valve when the motor runs.
There is a check valve that keeps air pressure from coming back to the compressor head and the relief valve.
I think the check valve is leaking tank pressure to the relief valve and compressor head.
The check valve is where the pressure switch mounts on to and it mounts threaded on to the compressor tank.
Try replacing the check valve

Take a spray bottle and put some soapy water in it; spray it on the path that air flows (line from pump to tank, pressure regulator, air line fitting) to find where the leak is. Once you find the leak will determine what has to be done to fix it. **the soapy water spray will bubble wherever air is leaking**

Hi Ricky welcome to FixYa, I am Kelly
Do you know if your model number starts with 106, 919, or 921? Also is it an upright stationary or a horizontal portable compressor? I am pretty sure you have the Century 6 Hp motor. (Obsolete FYI) but I will try and find the correct capacitor. IF you do have the Century electric motor... it is going to be a long search.

Normally a Craftsman model number would be 106.xxxxyyyy or 919.yyyyxxxx that information would be very helpful.

Kelly

Some motors will work with 120 volt or 240 volt You have to remove the small cover on the end of the motor & see if there is a diagram, where you move the wires for different voltages

You have to drop the oil pan . Since it's 4wd you won't need to jack it up. The pump has 2 bolts. The shaft has a slot in it that engages the distributor so when going back with the new one be sure you line up the shaft before tightening the bolts.

I would think that is is actually coming from the crankshaft seal and running down. Does it leak when you are not using it, or just when it is being used? If it leaks even when it is not being used then it could be the drain plug. If it only leaks when being used then I would look at the crankshaft seal. And yes it would be very feasable to repair it, because like all things they don't make them like they used to.

remove shroud and see if fan is broken but may be piston is shot