SHEET AS 1074597 - Caterpillar

Release Procedure (Hydraulic System Pressure)
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.
Park the machine on level ground.
Lower the lift arms to the ground.
Stop the engine.
Immediately turn the engine start switch key to the ON position. Disengage the parking brake.
Press each side of the auxiliary hydraulic control switch (A1 and A2) for one to two seconds in order to release the auxiliary system pressure. Keep the joystick control in the Neutral position while you press the auxiliary hydraulic control switch (A1 and A2) .
Engage the parking brake.
Start the engine and run the engine for at least 15 seconds in order to recharge the accumulator.
Stop the engine.
Immediately turn the engine start switch key to the ON position. Disengage the parking brake.
Move both of the joystick controls through all of the operating positions in order to release the hydraulic pressure in the work tool system and in the hydrostatic system.
Turn the engine start switch key to the OFF position.The pressure in the hydraulic system has now been released.Note: Some pilot oil lines on the downstream side of the accumulator may still contain pressurized oil. Use caution when you disconnect these pilot oil lines.