5-3
INDICATION / TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
5.2
ALTERNATOR (AUTOMOTIVE TYPE)
Alternator fails to charge
Limited charging system operating time
Battery condition
Alternator belt loose/broken
Loose, dirty, corroded terminals, or broken leads
Excessively worn, open or defective brushes
Open blocking diode
Regulator faulty
Open isolation diode
Open rotor (field coil)
Check
Check
4.4
Check/Repair
Check
Check
Check
Check
Replace
Low or unsteady charging rate
Alternator belt loose
Loose, dirty, corroded terminals, or broken leads
Excessively worn, sticky or intermittent brushes
Faulty regulator
Grounded or shorted turns in rotor
Open, grounded or shorted turns in stator
4.4
Check/Repair
Check
Check
Check
Replace
Excessive charging rate (as
evidenced by battery requiring too
frequent refilling) or charge
indicator shows constant “charge
with engine idling”
Regulator leads loose, dirty, corroded terminals, or wires
broken
Defective regulator
Clean/Repair
Check
Noisy alternator
Defective or badly worn V-belt
Worn bearing(s)
Misaligned belt or pulley
Loose pulley
4.4
Replace
4.4
Tighten
5.3
REFRIGERATION
5.3.1
Unit will not cool
Diesel engine
Malfunction(s)
5.1
Compressor malfunction
Compressor drive defective
Compressor defective
4.9
4.9
Refrigeration system
Defrost cycle did not terminate
Abnormal pressure
Hot gas valve malfunction
5.3.5
5.3.6
5.3.11
5.3.2
Unit runs but has insufficient cooling
Compressor
Compressor valves defective
Unloader malfunction
4.9
4.11
Refrigeration system
Abnormal pressure
Expansion valve malfunction
No or restricted evaporator airflow
Unloader malfunction
5.3.6
5.3.10
5.3.9
4.11
Engine does not develop full rpm Speed control linkage
Engine malfunction
4.3.4
5.1