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| Figure 14-13 Plunger type of relay with coil wound for operation on either current or voltage. |

| 3. The contacts must be properly aligned and correctly spaced. |

| 4. The contact springs must be in good condition, flexible, and show no signs of corrosion. |

| 5. The contact moving parts must travel freely and function in a satisfactory manner. The solenoids of relays of the plunger type must be free from obstruction. Bearings must be properly lubricated. Dashpot oil must be replaced if necessary. |

| 6. The connections to the relay must be tight. |

| 7. The insulation on wires and coils must not be frayed or worn. |

| 8. The relay assembly must be securely mounted. |

| 9. The coil must show no signs of overheating. |

| 10. The relay must not be abnormally noisy. |

| Contacts. Contacts constitute the major element requiring maintenance. The mechanical action of the relays should be checked to make certain that moving and stationary contacts make positive contact and are directly in |

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