ROLLER GP-TRACK-SINGLE FLANGE 7T2018 - Caterpillar

Illustration 1 g01624351
(D) ToolingTest Preparation
Stop the engine. Release the braking system oil pressure.ReferenceRefer to System Operation, Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.
Depress the service brake pedal at least 25 times to release any oil pressure that may be in the brake accumulator.Test Procedure
Illustration 2 g03026979
Brake accumulator (1) Cap
Remove cap (1) from the valve assembly on the brake accumulator.
Illustration 3 g03059536
Part of Tooling D (2) Valve (3) Pressure gauge (4) Chuck (5) Valve handle
Ensure valve (2) is closed. Connect chuck (4) of Tooling (D) onto the nitrogen charging valve for the brake accumulator.
Turn valve handle (5) on chuck (4) completely in the clockwise direction. Check the temperature of the air around the brake accumulator. The reading on the pressure gauge must be within the tolerances in Table 1.
If the reading on the pressure gauge is too high, slowly open valve (2) in order to lower the pressure. Close valve (2). If the reading on the pressure gauge is too low, use the following procedure to charge the brake accumulator.Charge Procedure
Illustration 4 g03017163
Tooling D (2) Valve (3) Pressure gauge (4) Chuck (5) Valve handle (6) Pressure gauge (7) Regulator assembly (8) Pressure regulating screw
Connect a hose from the nitrogen cylinder to valve (2). Ensure valve (2) is closed.
Open the valve on the nitrogen cylinder. Adjust screw (8) on regulator assembly (7) until pressure gauge (6) is at the correct charging pressure. Refer to Table 1 for the correct charging pressure.
Open valve (2) and put a charge of nitrogen into the brake accumulator. When pressure gauges (3) and (6) show the same reading, and the readings do not change, the brake accumulator has the correct charge. Ensure that neither reading changes when valve (2) is closed.Charge Procedure for a New or Rebuilt Accumulator
Removing all the air from the nitrogen chamber of the brake accumulator is necessary. When the brake accumulator is new or rebuilt, put approximately 0.59 L (0.623 qt) of SAE 10W oil in the nitrogen end of the accumulator. The oil is used to remove the air out of the nitrogen chamber of the brake accumulator. The oil is also used to lubricate the top seal of the accumulator piston. When the brake accumulator is installed on the machine, use the following procedure:
Low nitrogen charge can cause early pump failure because of short cycle times between the cut-in and cut-out operations of the brake accumulator charging valve.
Illustration 5 g03017163
Tooling D (2) Valve (3) Pressure gauge (4) Chuck (5) Valve handle (6) Pressure gauge (7) Regulator assembly (8) Pressure regulating screw
Connect chuck (4) onto the nitrogen charging valve for the brake accumulator.
Turn valve handle (5) on chuck (4) completely in the clockwise direction. Open valve (2) .
Start and run the engine until normal operating temperatures are reached. As hydraulic oil flows into the bottom of the brake accumulator, the air and then the oil will discharge through the test equipment. When the oil flow stops, the top of the brake accumulator will be free of air. The