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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
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 opened 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 stop valve malfunctioning. Remove and inspect valve.
Oil separator element (OS) clogged. Have element removed and inspected by an Atlas Copco Service representative.
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