Atlas Copco XAS 185 CD7 T4, Instruction Manual, Page: 33 / 40

- 33 -
Problem Solving
Problem Solving Chart
Use the chart on the following pages to help solve
mechanical problems.
It is assumed that the engine is in good condition, that
there is adequate fuel flow to the filter and injection
equipment, and compressor/engine maintained with the
recommended oil.
Make sure that the wires are not damaged and that they are
clamped tight to their terminals.
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 batter-
ies positive to positive, negative to negative.
4. Never operate the engine without the main or voltage
sensing cables connected in the circuit.
An electrical fault must be traced by an
electrician.
!
Problem Possible Faults Corrective Action
1. Lamps (H1, H2) do not light up when switching
(S1) to
position 1.
a. Discharged or defective battery.
b. Loose battery cable(s) or oxidized terminals.
c. Loose connection or damaged wiring.
d. Contact switch (S1) defective.
e. Circuit breaker defective. a. Check electrolyte level and charge battery. If no cells are
shorted and battery is discharged, trace cause and correct.
b. Check and correct as necessary.
c. Check wiring and connections (especially grounds), correct
as necessary.
d. With (S1) switched in position 1, check voltage between
ground and respectively each of the terminals of (S1). Volt-
age must register at each of the terminals; if not, replace
(S1).
e. Replace circuit breaker.
2. General alarm lamp (H2) does not light up when
switching (S1) to position 1
a. Lamp (H2) blown,
b. Alternator/regulator defective. a. Replace lamp.
b. Disconnect the wire from alternator terminal D+ and connect
it to terminal D-. If (H1) lights up, replace the alternator; if
not, test (S1); see remedy 1d.
3. Temperature alarm lamp (H1) does not light up
when switching (S1) to position 1.
a. Lamp (H1) blown,
b. See fault 1d.
a. Replace lamp.
b. See 1d.
4. Starter motor does not crank engine after switch-
ing (S1) to position 3
a. Low battery output.
b. Start button (S1) defective.
c. Alternator output inlay (K4) defective.
d. Start solenoid (KO) or starter motor defective a. See remedy 1a.
b. With (S1) in position “I”, check voltage between earth and
each of the terminals of (S1). Voltage must register at each of
the terminals; if not replace (S1).
c. Replace (K4).
d. Check start solenoid (K0). Have starter motor repaired