KIT- 5597449 - 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 attachments have been lowered, 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.
Use the following procedure to release the pressure in the hydraulic system:
Lower all implements to the ground.
Shut off the engine.
Turn the ignition to the ON position.
Illustration 1 g00682745
Place the left console in the down position. Move the control levers through the full range of travel. Step on both foot controls. This will relieve any pressure that may be present in the pilot system.
Turn the ignition to the OFF position.
Illustration 2 g00703417
Slowly loosen the fill/vent plug of the hydraulic tank in order to release the pressure.
Tighten the fill/vent plug of the hydraulic tank.
The pressure in the hydraulic system has now been released.