VALVE ASSEM. 6L4471 - 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, "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.
Park the machine on a level surface.
Activate the parking brake switch. The ladder will lower. Ensure that all personnel are clear of the ladder before you lower the ladder.
Position the boom and the grapple into the transport position.
Install steering lock.
Stop the engine.
Turn the engine start switch to the ON position.
Cycle all control switches. This will release any pressure that might be present in the pilot system.
Turn the engine start switch to the OFF position.
Push down on the hydraulic tank breaker relief valve until all pressure is released.Note: The hydraulic tank filler cap may be removed in order to relieve tank pressure.
When the pressure in the hydraulic system has been properly released lines and components can be removed.