Komatsu 830E Shop Manual page 137

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FIGURE 2-9. SIMPLIFIED SOLENOID CIRCUIT

Solenoid Checks

A basic solenoid circuit is shown in Figure 2-9. Sole-

noids can be checked electrically using the following

1. With all leads disconnected from the solenoid,

make test connections as shown to the sole-

noid, switch terminal and to the second switch

terminal "G", to check the hold-in winding (Fig-

2. Use the carbon pile to decrease the battery volt-

age to 20 volts. Close the switch and read cur-

3. To check the pull-in winding, connect from the

solenoid switch terminal "S" to the solenoid

motor "M" or "MTR" terminal (Figure 2-11).

To prevent overheating, do not leave the pull-in

winding energized more than 15 seconds. The

current draw will decrease as the winding tem-

perature increases.

4. Use the carbon pile to decrease the battery volt-

age to 5 volts. Close the switch and read cur-

The ammeter should read 9.0 to 11.5 amps.

NOTE: High readings indicate a shorted winding.

Low readings indicate excessive resistance.

24 VDC Electric Supply System

5. To check for grounds, move battery lead from

"G" (Figure 2-10) and from "MTR" (Figure 2-11)

to the solenoid case. Ammeter should read

zero. If not, the winding is grounded.

FIGURE 2-10. SOLENOID HOLD-IN WINDING

FIGURE 2-11. SOLENOID PULL-IN WINDING

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