Bostitch air compressors are made by Stanley. They come in a variety of sizes and styles and operate much the same as standard compressors of any brand. When working with compressors, you need the machine to complete three basic operations. First it needs to build pressure in the tank. Second, it has to be able to maintain that pressure until you release it and third, the pressure you must be able to release the pressure at a controlled pressure to maintain good tool operation.

Use soapy water to check fittings and valves for leaks.

Compressor Won't Build Pressure

Step 1

Inspect a compressor that refuses to kick on. Trace the power cords back to the outlet and make sure all connections are tight. Plug in a radio, or small lamp to test the outlet. If the outlet works but the compressor still will not come on, locate and press the round reset button, typically near the rear of the motor. If the outlet is not working, locate and flip the circuit breaker to restore power.

Step 2

Turn the compressor on and use a spray bottle with soapy water to spray around the fittings on all metal lines and hose on the compressor and tank. Look for bubbles around fittings and valves. Turn the compressor off and pull the safety release valve, located near the air outlet with pull ring through it, to release the pressure.

Step 3

Use a wrench to remove leaking valves and fittings. Remove the valve in the air line running into the tank, even if no bubbles appeared, to check it for damage. Look for cracks, replace damaged valves and fittings. Wrap teflon tape around the threads, reinsert and turn them clockwise to tighten.

Compressor Does Not Maintain or Blow Steady Pressure

Step 4

Check for leaks as previously outlined and replace damaged fittings and valves. Check air hoses in the same way and listen to tools for a tell-tale hissing that indicates a leak. Replace leaking hoses; take tools that leak to a professional service center for new seals.

Step 5

Adjust the pressure limiter adjustment screws. Locate and remove the shroud from the top of the compressor, using a screwdriver to remove the screws, then lifting the shroud off. Locate the two brass adjustment screws. Turn the one closest to you clockwise to raise the minimum pressure required to turn the compressor on. Turn it clockwise to lower it. Turn the other screw similarly to raise and lower the maximum, or cutoff pressure, at which the compressor stops.

Step 6

Adjust the pressure regulator, which is standard equipment on larger Bostitch compressors and can be found on the outlet line, just before the quick connector. Turn the knob to increase or decrease the pressure being released from the compressor.