LINK AS-TRACK 2349669 - Caterpillar

Personal injury or death can result if two persons are not used in the following procedure.
Personal injury or death can result from machine movement.Place blocks in front of and behind the wheels to make sure the machine does not move while the parking brakes are disengaged.
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.
Check the hydraulic tank oil level. Make sure that you maintain the correct oil level in the hydraulic tank throughout the air removal procedure.
Engage the parking brake and stop the engine.
Install the steering frame lock.
Put blocks in front of the wheels and behind the wheels.
Start the engine. Allow the braking system oil pressure to increase to the cut-out pressure.
Disengage the parking brake. Keep the engine running at low idle, maintain the brake accumulator and the pilot system pressure within working limits throughout the air removal procedure.
Illustration 1 g01027591
(1) Air purge valve
Connect one end of a transparent tube that is 6.4 mm (0.25 inch) in diameter to air purge valve (1) on the brake release cylinder. Put the other end of the tube into a suitable container for collecting the hydraulic oil. Open air purge valve (1) one-half turn.
Engage and disengage the parking brake until hydraulic oil, without air bubbles, flows through the tube into the container.
Close air purge valve (1) and remove the tube.