At what ambient temperature do the gearbox oil heaters turn on?

At what ambient temperature do the gearbox oil heaters turn on?

• A. 0°C
• B. -5°C
• C. 15°C
• D. 8°C

Answer: (D)

When ambient temperature drops, gearbox oil becomes thicker and harder to pump, which can increase wear on startup. To prevent this, the gearbox oil heater activates at about eight degrees Celsius. Once the air around the gearbox reaches eight degrees or lower, the heater warms the oil to a level that maintains proper viscosity for reliable lubrication and oil pressure during startup. Above this temperature, the oil is fluid enough on its own, so the heater remains off. That’s why the correct threshold is eight degrees Celsius.

When ambient temperature drops, gearbox oil becomes thicker and harder to pump, which can increase wear on startup. To prevent this, the gearbox oil heater activates at about eight degrees Celsius. Once the air around the gearbox reaches eight degrees or lower, the heater warms the oil to a level that maintains proper viscosity for reliable lubrication and oil pressure during startup. Above this temperature, the oil is fluid enough on its own, so the heater remains off. That’s why the correct threshold is eight degrees Celsius.