BOLT 5P7669 - Caterpillar

To protect the starting motor and other components, use a supply of pressurized air that is clean and dry.To start the engine at colder temperatures, a larger volume of starting air and/or a higher air pressure is necessary. Ensure a sufficient supply of air pressure for cold weather starting. Do not exceed the maximum air pressure for the starting motor. Refer to the engine's Application and Installation Guide for information on cranking torque and air starting motors at various temperatures.Condensation of vapor in the air supply can freeze in cold weather. Ice that forms in the supply lines will restrict the air supply. If particles of ice enter the inlet of the starting motor, the starting motor can be damaged.Dry air is required for cold weather in order to help prevent ice from forming in the supply lines. A water separator is recommended in order to remove vapor from compressed air prior to the air storage tank.If the engine operates in a humid environment with temperatures that are below 0 °C (32 °F), an air dryer is needed in order to prevent condensation from freezing in the piping. If the starting air is also used for pneumatic controls, an air dryer is essential.Lubrication
Always use an air line lubricator with the air starting motors that have vanes.For temperatures above 0°C (32°F), use a SAE 10 nondetergent oil of high quality.For temperatures below 0°C (32°F), use air tool oil.To maintain the efficiency of the starting motor, flush the starting motor at regular intervals. Pour approximately 0.5 L (.53 qt) of diesel fuel into the air inlet of the starting motor and operate the starting motor. This procedure will remove the dirt, the water and the mixture of oil from the vanes of the air starting motor.