143H and 163H Motor Graders All Wheel Drive Caterpillar

Complete the following steps in order to determine if the charge solenoid valve is operating properly.

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Illustration 1	g01074837
(1) Control valve for the all wheel drive (2) Charge solenoid valve (3) Forward pressure port

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

1. Install Tooling (A) on forward pressure port (3). Position the gauge in the cab for viewing during machine operation.

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Illustration 2	g00861107
(4) Control for the all wheel drive

2. With all wheel drive control (4) in the OFF position, start the machine. Run the engine in low idle.

3. The pressure gauge should read approximately 0 kPa (0 psi). If any pressure is indicated, check for a faulty solenoid or a worn valve.

4. Move all wheel drive control (4) from the OFF position to the ON position (MANUAL or AUTOMATIC). The pressure should be 2000 ± 70 kPa (290 ± 10 psi). If the pressure is not correct, inspect charge solenoid valve (2). The valve may be sticking or the valve may be worn.

5. Shut off the engine. Remove the hose assembly and the pressure gauge from the machine.