Atlas Copco XAS 175 Dd, Instruction Manual

Page: 31 / 34

I
NSTRUCTION
M
ANUAL
31
Problem
16. Compressor loaded
automatically to full
capacity after starting.
17. Engine does not speed
up immediately after
compressor load button
has been pressed and
compressor does not
deliver air.
18. Air consumption varies at
pressures above pre-set
working pressure, but
engine does not
accelerate nor
decelerate.
19. After working for some
time, the unit stops
through a shut-down
switch and alarm lamp
(H6) lights up.
Possible faults
a. Loading valve/switch (LV/S4) stuck in
loaded position.
b. Air intake throttle valve (TV) stuck in open
position.
c. Air leaks in regulating system.
a. Regulating valve (RV) out of order.
b. Air intake throttle valve (TV) stuck in closed
position.
a. Speed regulator (SR) defective.
a. Fuel tank (FT) contains insufficient fuel.
b. Engine oil pressure too low.
c. Compressor or engine overheating.
Corrective actions
a. Remove and dismantle.
Correct if necessary.
b. See remedy 11g.
c. See remedy 12b.
a. Remove and dismantle.
Correct if necessary.
b. See remedy 11g.
a. Remove, dismantle and inspect parts.
a. Fill fuel tank. Air-vent the fuel system if
fuel level sensor (B6) is not installed.
b. See Engine Operation Manual.
c. Start unit while observing compressor
temperature indicator (TG). If black
pointer rapidly reaches red pointer,
compressor overheats (See item 15);
if black pointer does not reach red one
and unit stops, engine overheats (see
Engine Operation Manual).