Atlas Copco XAS 185 KD7 IT4, Instruction Manual, Page: 37 / 42

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Problem: After working some time, the unit stops through a shutdown switch.
Problem: Air and oil mist expelles from air filters immediately after stopping.
Problem: Compressor overheating.
Alternator precautions
1. Never reverse the polarity of the battery or the alternator.
2. Never break any alternator or battery connections while the engine is running.
3. When recharging the battery, disconnect it from the alternator. Before using booster cables to start the engine, be sure of the polarity and connect the batteries correctly.
4. Never operate the engine without the main or voltage sensing cables connected in the circuit.
Possible faults Corrective actions
Engine oil pressure too low. Refer to the engine instruction manual.
Compressor or engine overheating. See corrective actions “Compressor overheating”.
Fuel tank contains insufficient fuel. Fill fuel tank.
Low coolant level. Top up cooling system.
Possible faults Corrective actions
Check valve at element outlet. Remove and inspect. Replace if necessary. Replace air filter elements and safety cartridges. Check the oil level
and add oil if necessary. Run the compressor for a few minutes, stop and recheck oil level.
Possible faults Corrective actions
Insufficient compressor cooling. Locate compressor away from walls; when banked with other compressors, leave space between them.
Oil cooler clogged externally. Clean oil cooler. Refer to section Cleaning Coolers.
Oil cooler clogged internally. Consult Atlas copco.
Oil filters clogged. Replace oil filters.
Oil level too low. Check oil level. Top up with recommended oil if necessary.
Thermostatic by-pass valve remains stuck in open position. Remove valve and check for proper opening and closing. Replace if out of order.
Fan blade(s) broken. Check and correct if necessary.
Oil separator element (OS) clogged. Have element removed and inspected by an Atlas copco Service representative.