AUXILIARY CONTROL VALVE GROUP 6J9990 - Caterpillar

Pressure Hydraulic System Bleeder Method
Make reference to the on the first page of the Air System And Brakes Testing And Adjusting section.
A commercially available pressure hydraulic system bleeder can be used. Before using the pressure hydraulic system bleeder, be sure tank (5) contains enough brake fluid of the recommended type and grade. Maintain a pressure of 362 52 kPa (53 8 psi) in the tank while bleeding the system.
Typical Hydraulic Pressure System Bleeder
(1) Master cylinder. (2) Adapter. (3) Hose. (4) Valve. (5) Tank. (6) Master cylinder.On earlier machines, each system is pressure bled separately. Bleed one brake system by pressurizing master cylinder (1), and then repeat the procedure for the other brake system by pressurizing master cylinder (6). Either system may be bled first.On later machines equipped with the reservoirs connected to both master cylinders, both systems can be pressurized at the same time by connecting adapter (2) to the reservoir filler opening.1. Remove the plug from the master cylinder reservoir and install adapter (2).2. Attach hose (3) to the adapter and open valve (4).3. Attach a transparent bleed hose to the bleed valve on the wheel brake head. Insert the other end of the hose into a container filled with enough brake fluid to submerge the end of the hose. Open the bleed valve approximately one-half turn.4. When the brake fluid flows into the container without air bubbles, close the bleed valve and remove the hose.5. Bleed the cylinder on the other wheel.6. Disconnect the pressure hydraulic system bleeder from the master cylinder, remove the adapter, and install the plug.7. Repeat procedure for other brake system.Remove Air From (Bleed) The Brake System - 62K9973-Up, 41K8438-Up, 17B1-Up
Make reference to the on the first page of the Air System And Brakes Testing And Adjusting section.
To bleed the service brakes, a commercially available pressure hydraulic system bleeder can be used. Before using the pressure hydraulic system bleeder, be sure tank (1) contains enough brake fluid of the recommended type and grade. Maintain a pressure of 362 52 kPa (53 8 psi) in the tank while bleeding the system.
Pressure Hydraulic System Bleeder
(1) Tank. (2) Hose. (3) Valve. If there is no pressure hydraulic bleeder available, the service brakes can be bled by pumping the brake pedals manually to force the brake fluid into the lines and force the air out.There are two brake systems. One is for the front service brakes, and one is for the rear service brakes. Each brake system is bled separately. Bleed the rear service brake system by pressurizing master cylinder (6), and the lines to the calipers for the disc brakes.
Location Of Plate On Hood Of Machine
(4) Plate.1. Remove plate (4).2. Remove the cover and diaphragm (5) from the oil reservoir for front service brake master cylinder (6).
Location Of Service Brake Oil Reservoirs
Service Brake Oil Reservoirs With Cover Removed
(5) Cover and diaphragm.
(8) Opening. (9) Reservoir.3. Install a threaded pipe 9.53 mm (.375 in) in diameter, and 152.4 mm (6.00 in) long in