PLATE AS-LH 5081366 - Caterpillar

Hydraulic accumulator contains gas and oil under high pressure. Improper removal or repair procedures could cause severe injury. To remove or repair, instructions in the service manual must be followed. Special equipment is required for testing and charging.
Turn the engine start switch to the ON position. The alert indicator for brake oil pressure should illuminate if the braking system is not at normal operating pressure.
Start the engine. Run the engine at half throttle for two minutes in order to increase the accumulator pressure. The alert indicator for brake oil pressure should go off.
Stop the engine. Apply the service brake pedal and release the service brake pedal until the alert indicator for brake oil pressure comes on. This will decrease the accumulator pressure. A minimum of three applications of the service brake pedal are required. Note: If your machine is equipped with the original accumulator, replace the accumulator. If your machine is equipped with a replacement accumulator, recharge the accumulator at your dealer.
If the alert indicator illuminates before three applications of the brake pedal, measure the accumulator precharge pressure. Your authorized dealer can measure the nitrogen gas pressure in the accumulator. Use only dry nitrogen gas for recharging.