BUSHING 2136715 - Caterpillar

Release Procedure
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.
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.
Lower all implements to the ground.
Engage the parking brake.
Stop the engine.Note: For machines with electrohydraulic controls, turn the engine start switch to the ON position after the engine stops. Place the implement lockout switch in the UNLOCKED position.
Move the control levers repeatedly through the full range of travel. This will relieve any pressure that may be present in the implement hydraulic system.
Depress the brake pedal repeatedly. This will relieve any pressure that may be present in the braking system.
Push down on the relief valve plunger on the hydraulic tank until all pressure is released.Note: The hydraulic tank filler cap may be removed slowly in order to relieve tank pressure. However, using the relief valve plunger is a safer method of relieving tank pressure.