Battery Charging System (Niehoff); General Description; Troubleshooting Procedures - Komatsu 830E Shop Manual

BATTERY CHARGING SYSTEM (Niehoff)

General Description

The Niehoff alternator (Figure 2-1) is a heavy duty,
24 VDC unit rated at 240 amps. A solid state voltage
regulator (5) mounted externally on the end housing
assembly provides voltage control during operation.
A single output connection (4) is located on the face
of the control unit (3) for connection to the truck bat-
tery positive circuit. The ground circuit cable can be
attached to either of two terminals (8) located on the
cover plate. A fan guard (6) protects maintenance
personnel from the rotating fan when the engine is
operating.
1. Shaft Key
2. Pulley Bushing
3. Control Unit
D02023

TROUBLESHOOTING PROCEDURES

(On-Truck)
Most 24 volt charging system problems can be diag-
nosed with the alternator installed on the truck,
operating under normal conditions. Many problems
can be attributed to loose or corroded cable connec-
tors. It is essential that all battery charging circuit
cables are in satisfactory condition and all connec-
tions are clean and securely tightened.
Equipment Required:
FIGURE 2-1. ALTERNATOR ASSEMBLY
4. Battery Positive Terminal
5. Voltage Regulator
6. Fan Guard
24 VDC Electric Supply System
• Belt tension scale
• Voltmeter, 0 - 40 volt range
• Ammeter, 0 - 400 amp range
7. Cooling Fan Assembly
8. Ground Terminals
D2-3