Normal gearbox operating temperature measured at the oil sump area of the housing should not exceed 100°F (38°C) above ambient temperature or 200°F (93°C) maximum. If the gearbox operating temperature exceeds these limits, shut down the unit and contact Cone Drive. Excessive oil sump temperature is indicative of overloading, misalignment, or improper or marginal lubrication. Continuous operation of the gearbox with the oil sump temperature above 200°F (93°C) will result in failure of the gearbox