GASKET KIT- 8T2486 - Caterpillar

Stop the engine. Push on the brake pedal many times until there is no brake pressure. The accumulator piston must be on the bottom of the cylinder to be sure the pressure of the nitrogen charge is correct.Gas pressure is variable with temperature. The accumulator must be at the same temperature as the air around it before it can be checked or a charge put into it. Use the chart to determine the correct nitrogen charging pressure.
Nitrogen Charging Group
(1) Pressure gauge. (2) Connection to nitrogen cylinder valve. (3) Regulator assembly. (4) Valve. (5) Pressure gauge. (6) Pressure regulating screw. (7) Valve handle. (8) Chuck.Check for Nitrogen Charge in the Accumulator
(9) Cover. (10) Cap.1. Remove protective cover (9) from the accumulator assembly. Remove cap (10) from the valve assembly on the accumulator.2. Use the 0 to 13 800 kPa (0 to 2000 psi) gauge (5) to check the nitrogen charge in the accumulator.3. Install chuck (8) on the valve of the accumulator.4. Turn valve (7) on chuck (8) completely in (clockwise). Check the temperature of the air around the accumulator. The pressure on the gauge must be within the tolerances shown in the chart.5. If the pressure on the gauge is too high, slowly open valve (4) to lower the pressure.6. If the pressure on the gauge is too low, charge the accumulator as follows:Accumulator Charge Procedure
7. Connect the hose from the nitrogen cylinder to valve (4).8. Close valve (4) and open the valve on the nitrogen cylinder. Make an adjustment to screw (6) on the regulator assembly until gauge (1) is at the pressure needed to correctly put a charge into the accumulator. Use the chart as a reference for the correct charging pressure.9. Open valve (4) and put a charge into the accumulator. Turn valve (4) off. If the pressure on gauge (5) is the same as gauge (1) and does not change, the accumulator has the correct charge. If there is a decrease in pressure on gauge (5), open valve (4) and allow more nitrogen to go into the accumulator.Perform this procedure as many times as necessary until the pressure on gauge (5) is the same as gauge (1), and does not change when valve (4) is turned off.10. Turn off valve (4). Turn the valve on the nitrogen cylinder off.11. Turn valve (7) on chuck (8) completely out (counterclockwise).12. Remove the test equipment.Rebuilt Accumulator Charge Procedure
It is necessary to remove all air from the nitrogen end of the accumulator. When the accumulator is rebuilt, put approximately 1.9 liters (2 quarts) of SAE 10W hydraulic oil in the nitrogen end of the accumulator. This oil will be used to help remove the air out of the nitrogen end of the accumulator and also to put a lubricant at the top seal of the accumulator piston. After the accumulator is installed on the machine, charge it as follows:
Low nitrogen charge can cause early pump failure because of short cycle times between the cut-in and cutout operations of