If you're reading this you probably already know at least a little something about diesel brake air compressors. 2.Brake Air Compressor Troubleshooting - Simplified The Basics Bad unloader valve Replace the unloader valve.
Check to make sure that fuses are of proper ampere rating. Worn or broken low pressure intake or discharge valves. Improve ventilation or relocate compressor. Clean cooling surfaces of cylinder, intercooler and discharge tube. Nick in belt groove of pulley or flywheel. Check for bent crankshaft - if bent then replace. Check for worn crankshaft, keyway or pulley bore, resulting from running with loose pulleys. Realign motor pulley with compressor flywheel. Bleed tank! Disassemble check valve assembly, clean or replace faulty parts. Receiver does not hold pressure when compressor shuts off 1. Check viscosity and change oil if necessary 5. Clean air filter element and check for other restrictions in the intake system. Drain oil, refill with oil of proper viscosity. Pipe air intake to less humid air source. Water entering oil reservoir due to compressor operating in high humidity environment. Knock occurs while compressor is loading. Remove the compressor cylinder head and inspect for foreign matter on top of the piston, clean, add a new gasket, and reassemble the head. Check for possible damage to bearings, replenish oil. Loose pulley, flywheel belt, belt guard, clamps or accessories. Turn on power, check fuse, breaker, or motor overload. Reset mechanism cuts out repeatedly fuses of proper size blow. Receiver pressure builds up quickly on compressor. Leaky gasket - High pressure inlet valve. If new safety valve leaks remove cylinder head, inspect and clean reed valve assembly.
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Remove and install new safety relief valve. Safety relief valve not functioning properly. Air leaking from inter stage safety relief valve when compressor is pumping. Check for worn worn crankshaft, keyway or pulley bore, resulting from running with loose pulleys. Receiver does not hold pressure when compressor is unloaded. Limit air usage to compressor capacity by using fewer or smaller tools. Check for leaks or restriction in hose or piping. Level compressor so that all feet touch the floor before tightening down. Service unit (change oil, clean or replace air cleaner element, more often, at least every 45 days or 500 operating hours for oil changes.Ĭ. Pipe air intake to less humid air source.ī. It may also be a good idea to replace your vibration pads 5. Add a new gasket and reassemble the head.
Remove the compressor cylinder head and inspect for foreign matter on top of the piston. Loose pulley, flywheel, belt, belt guard, cooler, clamps or accessories. Replace pressure switch to one that has a lower cut-in PSI Excessive noise in operation.
Pressure in the tank is below the cut-in pressure. Problem Cause Solution Compressor will not operate.
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