Ingersoll-Rand Thermo King SGCM 4000, Maintenance Manual

Page: 153 / 181

Alternator Operation and Diagnosis
152
General Inspection
Inspect the entire unit to see that controls are in order and that there are no loose nuts, bolts, electrical
connections or fittings. Inspect for secure engine to generator mountings. Remove any waste material
from area around the unit. Check battery connections.
Insulation
Inspect insulation on wires, coils and control components. See that insulation is not frayed, broken or
deteriorated. Replace wire having damaged insulation.
Field Coils, Stator Windings
Visually inspect the field coils and stator windings, their leads and connections to determine if they are
electrically and mechanically satisfactory. Look for any evidence of overheating, burned or frayed
insulation, loose connections, foreign matter, etc.
Generator Housing
Feel the alternator housing cautiously for abnormal temperatures as determined by previous experience
with the unit. If the generator is overheated, check the winding temperature with thermometer, locate the
cause such as lack of ventilation, overload, etc., and correct the condition or shut down the generator.
Inspect the generator housing for obstruction of air passages.
Generator Bearing
All alternators covered in this manual are fitted with a permanently lubricated bearing which requires no
maintenance in normal service.
Impeller Fan
Visually inspect the impeller fan to ascertain that no vanes are missing. Visually inspect the fan is not
encrusted with dirt or other foreign matter to the point where it will not function properly.
Coupling
Disc type coupling. Inspect to see that coupling bolts are tight and that the generator is solidly secured to
the engine.