TUBE AS 3499211 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Reference: Refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced before you perform the following procedure.
Permit only one operator on the machine. All other personnel should be kept away from the machine.
Move the machine to a smooth, level surface. Move the machine approximately ten feet in the forward direction. Then, move the machine approximately ten feet in the backward direction. Park the machine. Connect the steering frame lock so that the machine can not articulate. Power down the lift linkage in order to raise the front wheels off the ground. Then, raise the lift linkage in order to lower the front wheels to the ground. Lower the bucket to the ground.
Turn the engine start switch to the OFF position.
Engage the parking brake. Place blocks in front of the wheels and behind the wheels.
Depress the brake pedal repeatedly. This will relieve any pressure that may be present in the braking system.
Move the steering wheel several times in both directions in order to relieve the pilot pressure in the steering system. If you are servicing the steering cylinders, the steering valve, or the steering hoses,