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Page Title: PUMP NOISE (ACCOMPANIED BY OIL FOAMING IN RESERVOIR)
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TM 5-4210-233-14&P-1 Table 4-2. Unit Troubleshooting-Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION HYDRAULIC SYSTEM-Continued 25 PUMP NOISE (ACCOMPANIED BY OIL FOAMING IN RESERVOIR) Air entering at suction manifold. Check all lines for security, manifold for cracks and proper attachment.    Tighten, repair, or replace components as necessary (see para 4-9). 26 HYDRAULIC RESERVOIR OVERFLOWING Aerial ladder was lowered without hydraulic pressure applied and air entered the lift cylinders Raise and lower ladder several times to purge air from the lift cylinders and service hydraulic reservoir ELECTRICAL SYSTEM-IGNITION CIRCUITS (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2, 3, 5, and 6 of 16) 1 "BATTERY SWITCH" LIGHT DOES NOT ILLUMINATE (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2 of 16). Step 1. Check bulb. Replace bulb. Step 2. Check battery switch for proper operation. Replace switch (see para 4-101). Step 3. Check for +12V at circuit breaker #9 on battery accessory buss. Replace breaker. (see para 4-99). Step 4. Refer to "+12 volts not present at battery accessory buss" troubleshooting procedures. Step 5. Check wiring for continuity. Replace wire (see para 4-9). 4-69

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