ELBOW 0039163 - Caterpillar

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids.Dispose of all fluids according to local regulations and mandates.
When a hydraulic tank is filled after being drained, air can enter the pilot system. When a hydraulic tank is filled after the loosening or the removal of a pilot line, air can enter the pilot system. The air that is inside the pilot system does not always pass through the main system and through the breaker relief valve on the top of the tank. If the engine stops or if the engine is stopped by the operator, some air pressure may remain in the pilot system. This remaining air pressure may be enough to move the control valve. If the control valve is moved, the bucket will fall.If a loader has this problem, use the following procedures in order to remove the air from the hydraulic system.
Start the engine. Operate the engine at high idle.
Put the lever in the full LOWER position. This process will cause the bucket to lower and