Table 4-2. Unit Troubleshooting-continued -706880262

TM 5-4210-233-14&P-1

4-2. Unit Troubleshooting-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ELECTRICAL SYSTEM - AERIAL CONTROL PANEL - Continued

EMERGENCY HYDRAULIC POWER LIGHT WILL NOT ILLUMINATE ON AERIAL PANEL WHEN

EMERGENCY PUMP IS ACTIVATED

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 11 of 16.)

Step 1. Check bulb.

Replace bulb (see para 4-178).

Step 2. Check wiring to switch for continuity.

Replace wire (see para 4-9.4).

EMERGENCY HYDRAULIC POWER DOES NOT ACTIVATE FROM AERIAL PANEL SWITCH

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 11 of 16.)

Step 1. Check for proper operation of rear control panel emergency hydraulic power switch.

If pump does not function with rear switch, refer to rear switch troubleshooting procedure.

If pump functions with rear switch, go on to Step 2.

Step 2. Check switch for proper operation.

Replace switch (see para 4-179).

Step 3. Check wiring for continuity.

Replace wire (see 4-9.4).

Step 4. Refer to "swivel assembly slip ring contact interrupted" troubleshooting procedure.

AERIAL DISCHARGE VALVE DOES NOT CLOSE WITH PANEL SWITCH

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet I 1 of 16.)

Step 1. Check panel switch for proper operation.

Replace switch (see para 4-179).

Step 2. Check pneumatic solenoid valve in ladder compartments for proper operation.

Replace pneumatic solenoid valve (see para 4-200).

Step 3. Check aerial circuit breaker #6 for +12V.

Replace circuit breaker (see para 4-99).

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