Atlas Copco XAS 400 JD IT4 HOP Instruction Manual page 62

Problem: After working some time, the unit stops through a shutdown switch.
Possible faults
Engine oil pressure too low.
Compressor or engine overheating.
Fuel tank contains insufficient fuel.
Low coolant level.
Problem: Air and oil mist expelles from air filters immediately after stopping.
Possible faults
Check valve at element outlet.
Plunger of oil stop valve jammed.
Problem: Compressor overheating.
Possible faults
Insufficient compressor cooling.
Oil cooler clogged externally.
Oil cooler clogged internally.
Oil filters clogged.
Oil level too low.
Thermostatic by-pass valve remains stuck in opened position.
Fan blade(s) broken.
Oil stop valve malfunctioning.
Oil separator element (OS) clogged.
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.
Corrective actions
Refer to the engine instruction manual.
See corrective actions "Compressor overheating".
Fill fuel tank.
Top up cooling system.
Corrective actions
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.
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.
Corrective actions
Locate compressor away from walls; when banked with other compressors, leave space between them.
Clean oil cooler. Refer to section Cleaning coolers.
Consult Atlas copco.
Replace oil filters.
Check oil level. Top up with recommended oil if necessary.
Remove valve and check for proper opening and closing. Replace if out of order.
Check and correct if necessary.
Remove and inspect valve.
Have element removed and inspected by an Atlas copco Service representative.
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