COVER GP-SHIPPING 3P0390 - Caterpillar

Operation Description:This is the procedure for testing the orifice plug. The orifice plug is located in the all wheel drive control valve. The orifice plug is between the supply hoses for the all wheel drive piston motor. The orifice plug allows a flow of differential oil to the all wheel drive piston motors when the machine is in a turn. One of the front wheels may skid while the machine is operating in slippery material. As one wheel skids, the other wheel will spin quickly. This problem will occur when the orifice plug is missing. The orifice plug ensures that the flow of hydraulic oil will be divided between both front wheels.System OperationReference: Refer toTroubleshooting, "All Wheel Drive Control Valve".Test Step 1. Perform the following test: Machine Preparation for TroubleshootingResults:
OK - Proceed to test step 2.Test Step 2. Perform the following test: Hydraulic Pressure - ReleaseResults:
OK - Proceed to test step 3.Test Step 3.
Inspect the all wheel drive control valve. Determine if the orifice plug is missing from the all wheel drive control valve.How...Reference: Refer toTroubleshooting, "Use Of Orifice Plug Ensures Proper Operation Of All Wheel Drive {5051} {5050} 143H (1AL1-302), 163H (5AK1-120) Motor Graders".SpecificationsReference: Refer toTroubleshooting, "All Wheel Drive Control Valve".Expected Result:The 4T-4207 Orifice Plug is in the all wheel drive control valve.Results:
Yes - Stop.
No - Proceed to test step 4.Test Step 4.
Use a new Caterpillar part for replacement. Prior to installation, apply 154-9731 Thread Lock Compound to the orifice plug.
Install orifice plug (2) to the all wheel drive control valve. Tighten orifice plug (1) to a torque of 20 2 N m (15 1.5 lb ft).SpecificationsReference: Refer toTroubleshooting, "All Wheel Drive Control Valve".PartsReference: Refer toTroubleshooting, "6E-3907 VALVE GP PIN 1AL1-UP. PART OF 6E-3906 VALVE GP-CONTROL".Expected Result:The orifice plug has been correctly installed in the all wheel drive control valve.Results:
Repair Complete - Stop.