463、The precision of this adjustment is important

860、Remove the pin before you turn the pulley.

859、Rectify the defect before you stop the/pump momentarily.

858、Perform preliminary inspection of all articles that are maintained.

857、Make sure that you turn the control knob counterclockwise.

856、Make sure that you remove all tool and equipment.

855、Make sure that the indication on the gauge agrees with the quantity that is in the tank.

854、Make sure that the cabin pressure stays constant.

853、If test result fail, the; repair extent should be depended on the troubles

852、Keep tools away and pick up debris near the engine

851、Keep all the parts that are serviceable and discard those that are broken.