25
Instruction Manual
7. PROBLEM SOLVING
The trouble-shooting chart helps to solve mechanical problems.
It is assumed that the prime mover is in good condition.
Make sure that the wires are not damaged and that they are clamped
tight to their terminals.
An electrical fault must be traced by an electrician.
Problem Possible faults Corrective actions
1. Compressor loaded
automatically to full
capacity after starting.
a. Loading solenoid valve (LV) stuck in loaded
position.
b. Air intake throttle valve (TV) stuck in opened
position.
c. Air leaks in regulating system.
d. Loading solenoid valve (LV) defective.
a. Remove and check loading solenoid valve.
Replace valve if necessary.
b. Remove air filters, air intake manifold and
throttle valve spring seat. Withdraw throttle
valve and inspect. Replace parts where
necessary.
Caution: the spring seat is fixed with 4 short
and 2 long setscrews: first remove short
screws, then release spring tension by
alternately unscrewing the long ones.
c. Check hoses and their fittings. Stop leaks;
replace leaking hoses.
d. Check loading solenoid valve; correct or
replace if necessary.
2. Compressor does not
deliver air immediately
after loading solenoid valve
has been energized.
a. Membrane of regulating valve (RV) cracked.
b. Air intake throttle valve (TV) stuck in closed
position.
c. Loading solenoid valve (LV) defective.
a. If air blows from venting device, remove
and dismantle regulating valve. Replace
membrane.
b. See corrective action 1b.
c. Check loading solenoid valve; correct or
replace if necessary.
3. Excessive compressor oil
consumption. Oil mist
being discharged from air
outlet valve(s).
a. Oil level too high.
b. Flow restrictor (FR) in scavenge line (SL)
clogged.
c. Oil separator element defective.
d. Minimum loading pressure switch (PS) stuck in
opened position or set incorrectly.
a. Release pressure, wait approx. 10 minutes
and drain oil to the correct level.
b. Remove hoses and clean flow restrictor.
c. Have element removed and inspected by an
Atlas Copco Service representative.
d. Inspect. Switch prevents loading as long as
receiver pressure is below 5 bar(e). See
section 5.6 to adjust the pressure switch.
4. Compressor capacity or
pressure below normal.
a. Air consumption exceeds capacity of
compressor.
b. Choked air filter elements.
c. Regulating valve (RV) opens too soon or it is
defective.
d. Prime mover (PM) not up to max. load speed.
a. Check equipment connected.
b. Remove and inspect air filter elements.
Clean or replace, if necessary.
c. Adjust regulating valve. Dismantle and
inspect parts if valve does not respond.
Replace where necessary.
d. Check prime mover and correct if
necessary.
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