Komatsu 4D98 Series Shop Manual page 133

9.
Starting Motor
9.1.8 Characteristic test
1. No-load test
Since the characteristics can be checked roughly by means of a simple no-load test as ex-
plained below.
E Complete the test quickly since the rating of the starting motor is 30 seconds.
Fix the starting motor on a test bench and connect wiring as shown in Fig. 31. When the switch
is closed, a current flows in the starting motor, which is rotated at no-load.
Measure the current,
voltage and number of revolutions then and check if they satisfy the specified characteristics.
I
Ammeter
Voltmeter
L-l ?Q
Battery
Fig. 31
9-17