ORIFICE AS 3091876 - 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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Machine Preparation
Park the machine on a smooth, level surface. The location should also be dry and free of debris. Turn the engine start switch to the OFF position.
Permit only one operator on the machine. All other personnel should be kept away from the machine.
Lower the bucket to the ground.
Engage the parking brake.
Ensure that the engine start switch is in the OFF position. Release System Pressure
Depress the brake pedal repeatedly. This action will relieve any pressure that may be present in the braking system.
Place the key in the ON, engine off position. Move the implement control levers through the full range of travel. This action will relieve any pressure that may be present in the implement system. Place the lift control lever in the HOLD position. Place the tilt control lever in the HOLD position.
Illustration 1 g03884372
Open purge screws on main steering valve.