HOSE AS 2057865 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
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 level of the oil in the hydraulic tank for the steering and brake systems. Keep the tank full during the air removal procedure.
Illustration 1 g00664091
View of the Brake Control (1) Plug for removal of air.
Use the following steps to remove the air from the oil that is in the brake system: Start the engine and allow the brake accumulators to fully charge. Stop the engine. Remove plug (1) on the service brake valve. Depress the service brake pedal and hold the pedal until there are no air bubbles in the oil from plug (1). Install the plug and then release the service brake pedal.
Illustration 2 g00294762
Purging Screw for the Service Brakes (2) Purging screw.
Connect a hose to purging screw (2) at each of the service brakes.
Start the engine and run the engine at low idle. Open purging screw (2) in order to allow a flow of oil through the hose. Push the service brake pedal and hold the pedal until the flow of oil from the hose is free of air bubbles. Close the purging screw. Perform this procedure for each of the service brakes but only one brake at a time.
Fill the hydraulic tank for the steering and brake systems to the correct level.
Note the feel of the brakes within the first hours of operation. Repeat the air removal procedure if the service brakes are spongy or if the service brakes are soft.