TM10-3930-660-20 Table 2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION l Under  normal  operating  conditions,  circuit  breakers  should  never require replacement. However, if a circuit breaker does not reset after it has cooled, the circuit breaker is defective and must be replaced, para. 8-12. Check circuit for shorts, bad ground, or defective steering select valve. Replace steering Select valve if necessary, para. 14-11. Refer to the electrical schematic page FO-1. Step 2. Check  for  broken  wires,  loose  connections,  and  poor  grounds. Replace wires if necessary, para. 8-46 and 8-47. Tighten connections. Step 3. Check for defective run relay. Check that run relay closes, if not, replace run relay, para. 8-24. Step 4. Check for defective steering select switch. Check switch for continuity. Replace switch if defective, para. 8-8. Step 5. Check steering select valve. Test steering select valve. Replace valve if defective, para. 14-11. Step 6. Check blackout light switch. Replace switch if defective, para. 8-14. 49.NO POWER TO ONE WHEEL Step 1. Check for steering universal (Cardan) joint failure. Inspect and replace steering universal joints if necessary, para. 14-9. HYDRAULIC  SYSTEM 50. HYDRAULIC FUNCTIONS OPERATE SLOWLY Step 1. Cold hydraulic oil. Operate hydraulic system until hydraulic oil warms up. 2-48

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