LINK 6G4934 - Caterpillar

Table 1
Ride Control Accumulator Pressures at 21° C (70° F)
Item Pressure
6(1) 7500 kPa (1088 psi)
7(1) 3000 kPa (435 psi)
(1) Refer to Illustration 2
Table 2
Accumulator Precharge Pressure Temperature Relationship for a Typical Ride Control Accumulator
Temperature ° C (° F) Pressure Correction kPa (psi)
−7° C (20° F) −270 kPa (−39 psi)
−1° C (30° F) −215 kPa (−31 psi)
4° C (40° F) −160 kPa (−23 psi)
10° C (50° F) −105 kPa (−15 psi)
16° C (60° F) −50 kPa (−7 psi)
21° C (70° F) 0 kPa (0 psi)
27° C (80° F) 60 kPa (8 psi)
32° C (90° F) 115 kPa (16 psi)
38° C (100° F) 170 kPa (25 psi)
43° C (110° F) 225 kPa (32 psi)
49° C (120° F) 280 kPa (40 psi) Machine Preparation
Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Discharging the Accumulator
Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the required tooling, and the testing and charging procedure.Testing Procedure for the Accumulator Precharge Pressure
Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the required tooling, and the testing and charging procedure.Charging Procedure
Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the required tooling, and the testing and charging procedure.Note: Each accumulator will need to be isolated prior to servicing.Ride Control Activation
Note: The following steps are used to determine if the ride control valve is operating correctly. This test should be performed in order to verify that the ride control is being activated.
Lift the front wheels off the ground by moving the bucket to the full LOWER position. With the front wheels off the ground, place the lift control lever in the HOLD position.
Turn the ride control ON and place into "SERVICE" mode.
Set the parking brake.
Press and hold the ride control button for 2 seconds. The bottom two LEDs next to the button will illuminate to indicate that the ride control is in service mode. The Ride Control LED will turn green on the indication display while in the service mode.Note: The front wheels should lower to the ground. If the wheels do not lower to the ground, the ride control spool has not shifted to the ON position. The following causes could be the reason that the ride control spool does not move to the ON position:
A failure of the solenoid coil on the ride control valve
A failure of the cartridge valve in ride control valve
A failure of the spool valve in the ride control valve
A blockage in pilot circuit to the ride control valveRoad Test
Note: The pressure of 3000 kPa (435 psi) at 21 °C (70 °F) is the recommended low-pressure accumulator charge pressure for machines with an empty bucket of typical weight.The pressure of 7500 kPa (1088 psi) at 21 °C (70 °F) is the recommended high-pressure accumulator charge pressure for machines with normal payloads.Note: Due