Atlas Copco XAHS365 Md - Page 23

I
NSTRUCTION
M
ANUAL
23
10. Air consumption varies at
pressures above working
pressure, but engine does
not accelerate nor
decelerate.
a. Speed regulator defective. a. Remove, dismantle and inspect parts.
11. Compressor capacity or
pressure below normal.
a. Air consumption exceeds capacity of
compressor.
a. Check equipment connected.
b. Choked air filter elements. b. Remove and inspect elements. Clean or
replace, if necessary.
c. Regulating valve defective. c. Dismantle and inspect parts.
d. Engine not up to max. load speed. d. When engine control lever is against max.
speed stop, check speed and in case of power
loss, see "Operating Instructions" book of the
engine. If lever is not against stop, remove and
inspect speed regulator and adjust length of
operating rod.
e. Oil separator element clogged. e. Have element removed and inspected by an
Atlas Copco Service representative.
f. Air intake throttle valve remains partially
closed.
f. Remove air filters, air intake manifold and
throttle valve spring seat. Withdraw the valve
and inspect. Replace parts where necessary.
Caution: the spring seat is fixed with 4 short
and 2 long setscrews: first remove the short
screws, then release the spring tension by
alternately unscrewing the long ones.
g. Safety valve leaking. g. Remove and inspect. Replace if not airtight
after reinstallation.
h. Bleed-off valve leaking. h. Remove and inspect. Replace if necessary.
12. Pressure in air receiver
rises above maximum and
causes safety valve to
blow.
a. Regulating valve opens too late or its ball
valve spring is broken.
a. Dismantle and inspect parts.
b. Air leaks in regulating system. b. Check hoses and their fittings. Stop leaks;
replace leaking hoses.
c. Speed regulator malfunctioning. c. Remove, dismantle and inspect piston ring
and its O-ring. Replace worn or defective
parts.
d. Air intake throttle valve does not close for
some reason.
d. See 11f.
e. Minimum pressure valve malfunctioning. e. Remove and inspect valve.
f. Bleed-off valve malfunctioning. f. Remove and inspect valve.
13. After working for some
time, the unit stops
through a shutdown
switch. A fault indicator
lamp is alight.
a. Engine oil pressure too low. a. See the instruction manual of the engine.
b. Compressor or engine overheating. b. Start compressor while observing compressor
temperature indicator TG. If white pointer
rapidly reaches red pointer, compressor
overheats (see item 15); if white pointer does
not reach red one and unit stops, engine
overheats (see the engine instruction manual).
c. Fuel tank contains insufficient fuel. c. Fill fuel tank.
d. Low coolant level. d. Top up cooling system.
Problem Possible faults Corrective actions