TANK & MTG GP-HYDRAULIC 1428402 - Caterpillar

the transmission oil is allowed to warm-up gradually, the bearings maintain optimum operating conditions. High speeds during a cold start-up may decrease the durability of the bearing components. During warm-up, the electric control systems on the transmission will restrict available transmission gears for certain cold oil temperatures. The transmission must be preheated when started when the ambient temperature is −20 °C (−10 °F). Preheating can be accomplished by using an electrical heating element or by running the transmission in neutral for 20 minutes prior to operation.Transmission Oil HeaterCaterpillar recommends a commercial heating element be installed when the transmission is started and the ambient temperatures are −30 °C (−20 °F). Heaters facilitate starting the vehicle in cold climates, and they reduce the warm-up time required to get a vehicle operational. The CX35 has an SAE J1926 #16 straight thread "O" ring oil sump heater port located under the converter housing. As a general rule, suppliers recommend 8 to 10 watts per quart of sump oil. Commercial heaters with and without thermostats are available in 150, 300 and 500 watt capacities that are compatible with the CX35 transmissions.