Will not allow me to regulate air. compressor kicks on and builds to max pressure.

replace regulator.


https://servicenet.bostitch.com/documents/English/Instruction%20Manual/Bostitch/N410108,BTFP02012.pdf


Pressure Reducer

replace the regulator as it indicates that he air is not flowing through the regulator

It sounds like it is fighting against the head pressure. If so equipped, check the one way valve often used where the air enters the tank. If they get stuck open it causes back pressure. It could also be in the head of the pump. A blown gasket, broken reed valve or other type of valving could also cause this but usually they won't build to full pressure either. Electric compressors often use a small unloader valve mounted to the main pressure switch (on/off box-it would be attached to a small plastic or copper tube) and if bad it too would not allow the head pressure to release in order for it to restart when needed.

Hi,
Check to see if the switch will kick in if the pressure is released from the hose going to activate it...if so then the problem is the air being trapped between a check valve and the switch in the hose...
I think that is your problem...
There should be a way for the air pressure to change and represent the tank air pressure accurately....
The different compressors all have different ways of checking the air and then allowing it to release as the the tank pressure decreases..

There is a small hole there somewhere that is clogged with dirt and or oil...find that and clean it and you are in business again...

heatman101

Hello. W/D here.
Check the rating tag on the safety valve that is letting the pressure off of the tank. I'm pretty sure that it is less than the 200 psi that you are seeing.
What I believe is that the contacts in the pressure switch are either set too high, or the switch is bad. Check the rating for your switch, it's kick in (on) and kick out (off) pressures. If you have these values, you can set the switch yourself. Pump the pressure up to where you want it to kick out (off) and stop the compressor at that pressure by pulling the plug. Remove the contacts cover and adjust the spring until the contacts part, setting the contacts to the actual pressure. Drain the air down to below the kick in point. Replace the cap over the contacts, and turn the compressor back on. It should kick off at the pressure that you dialed in.
If the contacts will not set, or if there is too much carbon on the contacts, or if you note any burned wires or melted terminals, replace the switch. Minor carbon on the points can be removed with an emery board or fine sandpaper, and this should be regarded as a temporary fix.
Best regards, --W/D--

IT depends on the tool. Some tools require higher cfm. (cubic feet per minute) of air. IF your air line is not large enough, then sometimes 90psi is not enough to operate a tool as there is a pressure drop at the tool. Look at the required cfm for each tool. Find a chart for air line size, cfm and pressure. Most impact wrenches should be used on a minimum 3/8" air hose. You could look at your manual and see what the max pressure is on your compressor. You may be able to decrease the differential pressure e.g off and 100 and on at 90, but then the compressor will cycle more frequently, and may exceed the duty rating of the compressor.

how do you know one tank drops to zero unless you have a pressure gauge on both tanks sounds unlikely unless you are looking at the gauge on the pressure regulator

Is you air regulator working? I suspect your reed valves in the head need replacing as they may not be holding pressure over the 45psi that you mentioned, and are allowing the air pressure to defeat them which allows the psi over 45 psi to bleed back into the air compressor cylinder.

Compressor has a bad valve. Needs to be replaced. The owners manual should have a break down of the compressor. Order the head kit.

It looks like there might be a knob which sets the max air pressure coming from the compressor. If there is one, this may have been turned down.

There are usually 3 pressure settings on an electric compressor. Compressor max, pressure switch cut on, and pressure switch cut off.