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Table 4-2. Unit Troubleshooting-continued -706880269
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Table 4-2. Unit Troubleshooting-continued -706880271
TM 5-4210-233-14&P-1
4-2. Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - EMERGENCY HYDRAULIC SYSTEM
1 EMERGENCY HYDRAULIC MOTOR DOES NOT OPERATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 9 of 16.)
Step 1. Check switch.
Replace switch (see para 4-179).
Step 2. Check two solenoids for proper operation.
Replace solenoid (see para 4-9.4).
Step 3. Check motor.
Replace motor, Notify Direct Support.
Step 4. Check for +12V at circuit breaker #6 on aerial master buss.
Ensure aerial master is on. Replace breaker as required (see para 4-99).
Step 5. Check wiring for continuity.
Replace wire (see para 4-9.4).
2 EMERGENCY HYDRAULIC POWER ACTIVATED LIGHT DOES NOT ILLUMINATE
(Refer to Electrical Wiring Diagram, Appendix H, Sheet 9 of 16.)
Step 1. Check bulb.
Replace bulb (see para 4-178).
Step 2. Confirm pump is actually running when switch is actuated.
If pump is not running, refer to "emergency hydraulic motor does not operate"
troubleshooting procedure.
If pump is running, go on to step 3.
Step 3. Check wiring to light for continuity.
Replace wire (see para 4-9.4).
4-141

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