What causes a squealing sound in my Porter-Cable Air Compressor?
- HHelen DavisSep 23, 2025
A squealing sound in your Porter-Cable Air Compressor usually means the compressor pump has no oil. See Oil-Checking paragraph in the Maintenance section.
What causes a squealing sound in my Porter-Cable Air Compressor?
A squealing sound in your Porter-Cable Air Compressor usually means the compressor pump has no oil. See Oil-Checking paragraph in the Maintenance section.
What to do if my Porter-Cable Air Compressor motor will not run?
If the motor of your Porter-Cable Air Compressor won't start, let it cool down to allow the overload switch to reset automatically. Ensure the tank pressure is below the pressure switch's cut-in point, so the motor starts automatically. Inspect and clean or replace the check valve if it's stuck. Check the wiring connections inside the pressure switch and terminal box. Avoid operating the compressor in a paint spray area. Bleed the line by pushing the lever on the pressure switch to the 'off' position; if it doesn't open, replace the switch. Check the fuse box, replace blown fuses, and reset the circuit breaker, using the correct time-delay fuse and rating. Rule out low voltage conditions and extension cord issues, and disconnect other appliances or use a dedicated circuit.
How to stop air leaks at fittings on Porter-Cable Air Compressor?
If you notice air leaks at the fittings of your Porter-Cable Air Compressor, try tightening the fittings where you hear air escaping. You can also check the fittings with a soapy water solution to identify leaks. Be careful not to overtighten them.
How to fix air leaks at the check valve on a Porter-Cable JOB BOSS C3550 Air Compressor?
If there are air leaks at or inside the check valve of your Porter-Cable Air Compressor, it could indicate a damaged check valve seat. A defective check valve can cause a constant air leak at the pressure release valve when the tank is pressurized and the compressor is off. Replace the check valve.
How to fix restricted air intake on Porter-Cable JOB BOSS C3550?
If your Porter-Cable Air Compressor has a restricted air intake, it is likely due to a dirty air filter. Clean or replace the air filter.
What causes excessive tank pressure in my Porter-Cable Air Compressor?
Excessive tank pressure in your Porter-Cable Air Compressor, indicated by the safety valve popping off, can be due to the pressure switch not shutting off the motor when the compressor reaches "cut-out" pressure, or the pressure switch "cut-out" being set too high. If the outfit does not shut off, move On/Auto/Off lever to the "OFF" position, if the outfit does not shut off contact a Trained Service Technician.
Why does the pressure drop when using accessories with my Porter-Cable JOB BOSS C3550 Air Compressor?
It's normal for some pressure drop to occur on your Porter-Cable Air Compressor when an accessory is in use. However, if the pressure drop is excessive, adjust the regulator as instructed in the Operation section, while the accessory is being used.
Why is my Porter-Cable Air Compressor making a squealing sound?
If your Porter-Cable Air Compressor is making a squealing sound, check the oil level in the compressor pump.
How to fix air leaks at the pressure switch release valve on my Porter-Cable Air Compressor?
If there are air leaks at the pressure switch release valve on your Porter-Cable Air Compressor, it indicates a defective pressure switch release valve. Contact a Trained Service Technician.
What to do if my Porter-Cable Air Compressor regulator will not shut off air outlet?
If the regulator on your Porter-Cable Air Compressor will not shut off the air outlet, it is probably because the regulator is damaged. Have it checked by a Trained Service Technician.
Step-by-step guide for adding the correct type and amount of oil to the compressor pump.
Instructions for locating and properly positioning the air compressor for use.
Essential guidance on electrical grounding to prevent shock hazards.
Recommendations for using extension cords to avoid power loss and overheating.
Details requirements for electrical circuits, fuses, and breakers for safe operation.
Overview of the compressor's functions and controls for user familiarity.
Procedure for safely shutting down the air compressor after use.
Required steps to properly break-in the compressor before regular operation.
Steps for starting the air compressor and preparing it for operation.
Guide for connecting and utilizing the optional remote control console.
Outlines routine checks and tasks for the user to perform.
Instructions on how to drain condensation from the air tank.
Procedures for checking and changing the compressor oil.
Steps for inspecting and replacing the air filter for optimal performance.
Safety precautions to take before performing maintenance or repairs.
Detailed instructions for replacing or cleaning the check valve component.
| Model | C3550 |
|---|---|
| Power Source | Electric |
| Max Pressure | 135 PSI |
| Motor Power | 1.5 HP |
| Pump Type | Oil-Free |
| Weight | 60 lbs |
| Type | Portable |












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