Figure 3-25. Solenoid Valves L1 and L2 test procedures

TM 5-4120-356-14

TEST PROCEDURES FOR SOLENOID VALVES L1 AND L2

REFER TO PARAGRAPH 3-13a FOR PRELIMINARY

STEPS IN MAINTENANCE OF SOLENOID VALVES

L1 AND L2.

2. DISCONNECT PLUG P3 FROM THE JUNCTION BOX.

3. TO TEST SOLENOID VALVE L1, CONNECT A

SOURCE OF DC VOLTAGE (SET AT ZERO OUTPUT)

ACROSS PINS H AND K OF PLUG P3.

4. WHILE LISTENING FOR A CLICK FROM SOLENOID

VALVE L1, SLOWLY INCREASE THE OUTPUT OF

THE DC VOLTAGE SOURCE. THE CLICK SHOULD

OCCUR AT OR SHORTLY BEFORE THE TIME THE

VOLTAGE HAS BEEN INCREASED TO 20.4 VOLTS.

5. WHILE LISTENING FOR A CLICK FROM SOLENOID

VALVE L1, SLOWLY DECREASE THE VOLTAGE. THE

CLICK SHOULD OCCUR AT OR SHORTLY BEFORE

THE TIME THE VOLTAGE HAS BEEN DECREASED

TO 18 VOLTS.

6. DISCONNECT DC VOLTAGE SOURCE FROM PINS

H AND K OF PLUG P3.

7. TO TEST SOLENOID VALVE L2, CONNECT DC

VOLTAGE SOURCE (SET AT ZERO OUTPUT)

ACROSS PINS E AND F OF PLUG P3.

8. WHILE LISTENING FOR A CLICK FROM SOLENOID VALVE L2, SLOWLY INCREASE THE OUTPUT OF THE DC

VOLTAGE SOURCE. THE CLICK SHOULD OCCUR AT OR SHORTLY BEFORE THE TIME THE VOLTAGE HAS BEEN

INCREASED TO 20.4 VOLTS.

9. WHILE LISTENING FOR A CLICK FROM SOLENOID VALVE L2, SLOWLY DECREASE THE VOLTAGE. THE CLICK

SHOULD OCCUR AT OR SHORTLY BEFORE THE TIME THE VOLTAGE HAS BEEN DECREASED TO 18 VOLTS.

DISCONNECT DC VOLTAGE SOURCE FROM PINS E AND F OF PLUG P3.

10.

TS5-4120-356-14/3-25

11. RECONNECT PLUG P3 TO RECEPTACLE J3 ON THE JUNCTION BOX.

F i g u r e 3-25. Solenoid Valves L1 and L2 test procedures