ARM 8D4513 - Caterpillar

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(1) Ride control accumulator #1 (2) Ride control accumulator #2 (3) Ride control solenoid (4) Head end pressure (Boom cylinder) (5) Ride control solenoid (6) Ride control solenoid
Read "Ride Control Accu #1" and "Ride Control Accu #2" pressures on the monitor. Refer to Table 1 for the correct charging pressure and temperature relationship for the accumulators. The pressure reading for both ride control accumulators should be equal to 500 kPa (73 psi).
If the charge pressure for the ride control accumulators is not correct, charge the accumulators to the correct gas pressure.Check if Solenoids Close Correctly
Note: The following procedure checks the correct closing of ride control solenoids (3) , (5) , and (9) .
Illustration 6 g02452604
Engine speed dial
Set the engine speed dial at "1".
Deactivate the ride control function at the soft switch panel by pushing down on the button for ride control.Note: The indicator light will not be illuminated when the ride control function has been disabled.
Release the pressure of the ride control accumulators by moving the implements to the ground until the "Boom Cylinder Head Pressure" is less than a pressure of 3000 kPa (435 psi).
Stall the BOOM UP control.
Verify that the "Boom Cylinder Head Pressure" is greater than a pressure of 30000 kPa (4351 psi). The pressure reading for "Ride Control Accu #1" and "Ride Control Accu #2" should be around the value that was measured at Step 6 of the "Check the Gas Charge Pressure for the Accumulators" procedure.
Stall the BOOM DOWN control.
Illustration 7 g02365397
Typical example of a main control valve for the M316D (7) Rod end pressure (Boom cylinder)
Illustration 8 g02365320
Typical example of a main control valve for the M318D and M322D (7) Rod end pressure (Boom cylinder)
Use the machine implement to lift the machine slightly off the ground.
Verify that "Boom Cylinder Rod Pressure" is equal to or greater than 13000 kPa (1885 psi).Note: This pressure should remain constant and stable for several seconds.Check if Solenoids Open Correctly
Note: The following procedure checks the correct opening of ride control solenoids (3) , (5) , and (6) .
Set the engine speed dial at "1".
Ride control activation/operation may cause sudden movement of the boom. Boom movement may cause personal injury or death. Be sure no one is under or near the boom before activating ride control. Keep all personnel away from the boom area during ride control operation.
Activate the ride control function at the soft switch panel by pushing down on the button for ride control.Note: The indicator light will be illuminated when the ride control function is activated.Note: Refer to Operation and Maintenance Manual, SEBU8694, "Operator Controls" for additional information concerning activation of the ride control function.
Stall the BOOM UP control.
Verify the "Boom Cylinder Head Pressure", and the pressure for "Ride Control Accu #1" and "Ride Control Accu #2".Note: All three pressures should be nearly the same pressure.
Stall the BOOM DOWN control.
Verify the "Boom Cylinder Rod Pressure" is less than 6000 kPa (870 psi).Note: This pressure should remain constant and stable for several seconds.
Testing the ride control is