Komatsu 830E-AC Shop Manual page 245

8. Check the battery. The batteries must be in
good condition and fully charged. If any battery
condition is marginal, replace it with one known
to be in good condition.
For split battery pack, dual voltage systems,
battery rest voltages with 0.3 V. When the 12V
battery voltage is more than 0.3 V lower than
24V battery voltage, check the 12V battery cir-
cuit to verify adequate charge.
Polarity of the battery and the alternator must
agree; reverse polarity will damage the alterna-
tor. The alternator is negative ground.
9. Check the voltage output and use the informa-
tion below to determine possible cause.
a. Causes of low voltage
1). Loose or broken drive belt
2). Batteries low state of charge
3). Current load on system greater than
the alternator can produce
4). Defective wiring or poor ground path
5). Low regulator set point
6). Defective voltage regulator
7). Defective alternator
8). Lost residual magnetism
b. Causes of high voltage
1). Wrong regulator
2). High regulator set point
3). Defective regulator
4). Defective alternator
c. Causes of no voltage output. See
Regulator Bypass Test (No Output) for
additional testing information.
1). No drive belt
2). No battery (B+) voltage at alterna-
tor's (B+) terminal
3). Defective regulator
4). Defective alternator
5). Lost residual magnetism
10. Check the condition of the battery and the
charge voltage reactions.
D10003 07/06
NOTE:
temperatures stabilize, the conditions listed here may
be observed during cold start voltage tests.
a. Maintenance-type batteries display the fol-
b. Low maintenance-type batteries display the
c. Maintenance free-type batteries display the
d. High-cycle, maintenance-free type batteries
Battery Charging Alternator
Until electrical system
lowing characteristics.
1). Immediately after engine start, the sys-
tem Volts are lower than regulator set
point with medium amps.
2).Three to five minutes into the charge
cycle, higher system Volts and reduced
amps.
3). Five to ten minutes into the charge cycle,
system Volts are at, or nearly at, the regu-
lator set point, and the amps are reduced
to a minimum.
same characteristics as maintenance-type
batteries, except cycle times may be longer.
following characteristics.
1). Immediately after engine start, the sys-
tem Volts are lower than the regulator set
point with low charging amps.
2). Fifteen to thirty minutes into the charge
cycle, still low Volts and low amps.
3). Fifteen to thirty minutes into the charge
cycle, Volts increase several tenths, amps
increase gradually, then increase quickly
to medium to high amps.
4). Twenty to thirty-five minutes into the
charge cycle, Volts increase to the set
point and amps decrease.
display the following characteristics.
1). These batteries respond much better than
the standard maintenance-free batteries.
2). The charge acceptance of these batteries
may display characteristics similar to stan-
dard, maintenance-type batteries.
component
D10-15