Atlas Copco XAS 175 Dd Instruction Manual page 29

Problem
5. Starter motor cranks
engine when depressing
(S2), but engine does not
fire.
6. Engine fires, but lamp
(H1) remains alight;
compressor stops when
releasing (S2).
7. Engine is running, but
shuts down immediately
after (S2) has been
released.
8. Lamp (H6) remains alight
for over 10 seconds after
starting.
9. Hourmeter (P3) does not
count running time.
10. Compressor does not
unload and engine keeps
running at maximum
speed when closing the
air outlet valves (AR);
safety valve (SV) blows.
11. Compressor capacity or
pressure below normal.
Possible faults
a. Switch (S2) defective.
b. Fuel solenoid (Y1) defective.
c. Low battery output.
a. Alternator drive belt broken or slipping.
b. Alternator/regulator defective.
a. Override push button released too soon.
b. Insufficient engine oil pressure.
c. Fuel tank (FT) contains insufficient fuel.
d. Engine oil pressure shut-down switch (S5)
or compressor temperature shut-down
switch (S7) defective.
a. Fuel tank (FT) contains insufficient fuel.
b. Insufficient engine oil pressure.
c. Engine oil pressure switch (S5) or
compressor temperature switch (S7)
defective.
d. Engine temperature switch (S14), V-belt
protection switch (S15) or fuel level sensor
(B6) defective; relay (K8) out of order.
a. Hour meter (P3) defective.
a. Air leaks in regulating system.
b. Regulating valve (RV) incorrectly set or
defective.
c. Unloader valve (UV) or its actuating piston
stuck.
a. Air consumption exceeds capacity of
compressor.
b. Choked air filter element (AF).
c. Regulating valve (RV) incorrectly set.
d. Engine not up to full speed.
I
NSTRUCTION
Corrective actions
a. See remedy 4b.
b. Check solenoid and its valve; correct or
replace as necessary.
c. See remedy 1a.
a. Check and correct as necessary.
b. Have assembly repaired.
a. Release button after engine oil pressure
has built up to above the minimum
allowed value.
b. Stop at once, consult Engine Operation
Manual.
c. Fill fuel tank.
d. Remove and test switches.
Replace if out of order.
a. Fill fuel tank.
b. Stop at once, consult Engine Operation
Manual.
c. Stop at once, test switches, replace if
necessary.
d. Stop at once. Check V-belt. If not broken,
test switches; replace as necessary.
If in order, replace relay (K8).
a. Replace.
a. Check and repair.
b. Adjust or repair regulating valve;
see section 5.1.
c. Repair unloader valve assembly.
a. Check equipment connected.
b. Remove and inspect element.
Clean or replace if necessary.
c. See section 5.1.
d. When engine control lever is against max.
speed stop, check speed and in case of
power loss, see Engine Operation
Manual. If lever is not against stop,
remove and inspect speed regulator and
adjust length of operating rod.
M
ANUAL
29