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TM 5-4210-233-14&P-1
4-2. Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - AERIAL CONTROL PANEL - Continued
14
AERIAL LADDER HOIST CYLINDER LOCKING VALVES DO NOT RELEASE LADDER WHEN
RAISE/LOWER CONTROL IS PLACED IN "LOWER" POSITION - Continued
Step 4. Refer to "swivel assembly slip ring contact interrupted" troubleshooting procedure.
Step 5. Refer to "aerial +12 volts not present at aerial master buss" troubleshooting procedure.
Step 6. Check wiring for continuity.
Replace wire (see para 4-9.4).
15
ELEVATION SLOW-DOWN VALVE DOES NOT ENGAGE WHEN LADDER REACHES
700 ELEVATION (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 0 of 16).
Step 1. Check slow-down valve limit switch for proper operation.
Adjust/replace slow-down valve limit switch (see para 4-197).
Step 2. Check solenoid valve for proper operation by applying 12V to coil.
Repair/Replace valve (see para 4-9.4).
Step 3. Check aerial circuit breaker #5 for +12V.
Replace breaker (see para 4-99).
Step 4. Check wiring for continuity.
Replace wire (see para 4-9.4).
Step 5. Refer to "swivel assembly slip ring contact interrupted" troubleshooting procedure.
Step 6. Refer to "+12 volts not present at aerial master buss" troubleshooting procedure.
4-136
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