PISTON AS 2074914 - Caterpillar

Table 1
Required Tools    
Part Number     Description    
8T-5320     Hydraulic Test Group    
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.
Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the bucket and/or attachments to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Air Over Hydraulic Brake System
Stop the engine.
Illustration 1 g00714134
Pressure Taps for the Pilot System (1) Pressure tap for the pilot pump. (2) Pressure tap for the pressure control and selector valve.
Attach an 8T-5320 Hydraulic Test Group to pressure tap (1) .
Start the engine and run the engine at high idle. Bring the oil to normal operating temperature. The pressure reading for machines that are equipped with 6E-6659 Vane Pump should be 2400 350