WIRE AS-GROUND 1270594 - Caterpillar

Charging Procedure
Illustration 12 g02606538
Accumulator Valve
(1) Guard. (2) Charging Valve. (A) Protective Cap.
Illustration 13 g00282185
(3) Nipple
(4) Coupling As
(5) Pressure gauge
(6) Hose As
(7) Coupling As
(8) Nipple
(9) Valve
(10) Pressure gauge
(11) Regulator As
(12) Pressure regulating screw
(13) Chuck for nitrogen cylinder valve
(14) Valve handle
(15) Chuck
(16) Hose As
(17) TeeBefore proceeding to the test procedure that follows, complete the procedure:
Testing and Adjusting, "Machine Preparation for Troubleshooting"
Perform Step 1 through Step 9 of the "Testing Procedure for the Accumulator Precharge Pressure" for instructions on the installation of the nitrogen charging group.
Turn the ride control ON and place into "SERVICE" mode.
Set the parking brake.
Press and hold the ride control button for 10 seconds. The keypad will indicate that the ride control is in service mode by flashing all three ride control indicator lights. The indicator light will turn to an amber color while in the service mode.
Open needle valve (9).
Start the engine.
Pull back on the lift control lever in order to raise the boom to full lift.
Recenter the lift control lever.
Pull back on the lift control lever again. Pulling back on the control lever will cause the lift circuit to reach relief pressure.
Close needle valve (9).
Lower the boom in order to place the work tool on the ground.
Move the lift control lever into the FLOAT position (past detent) and release.
Attach the open end of hose assembly (6) to needle valve (9) by using coupling (7) and nipple (8).
Attach regulator assembly (11) to a nitrogen tank.
Adjust pressure regulating screw (12) in order to obtain a pressure reading of 5000 70 kPa (725 10 psi) on gauge (5).Note: 5000 70 kPa (725 10 psi) is the appropriate pressure for the accumulator when the ambient temperature is 21 °C (70 °F). If the machine has been running for some time, the temperature of the accumulator may be different from the ambient temperature of the outside air. Refer to Table 2 for the proper pressure.
Open needle valve (9). Measure the amount of time that is required for gauge (10) to obtain the charge pressure. Charging time should take 10 to 20 seconds.Note: If the charging time is less than 10 seconds, repeat Step 1 through Step 8 in order to exhaust the nitrogen gas from the accumulator. Repeat Steps 9 through 14 in order to charge the accumulator.
Once the accumulator is charged, close the nitrogen charging valve.
Illustration 14 g02606758
158-2336 Gas Valve
Accumulators equipped with a 158-2336 Gas Valve, with a wrench, tighten hex nut at location (B) of the nitrogen charging valve in a clockwise direction to close the nitrogen charging valve (2). Tighten the hex nut to a torque of 8.8 2 N m (6.5 1.5 lb ft)
Illustration 15 g02614762
222-2367 Gas Valve Assembly
Accumulators equipped with a 222-2367 Gas Valve Assembly, turn valve handle (14) in a counterclockwise direction in order to close nitrogen charging valve (2).
Close the valve on the nitrogen cylinder.
Slowly loosen chuck (15) from charging valve (2) and allow the pressure to vent from hose (16). Observe gauge (10) in order to determine when the