The All Wheel Drive May Be Malfunctioning{3030, 5479} Caterpillar

Backhoe Loader:

416E (S/N: SHA1-UP; CBD1-UP)

420E (S/N: HLS1-UP; KMW1-UP)

430E (S/N: DDT1-UP; EAT1-UP)

Introduction

The all wheel drive switch on the Backhoe Loaders that are listed above may fail. This procedure may help identify problems with the all wheel drive switch. The malfunction could be caused by other components in the All Wheel Drive System.

Problem

Illustration 1	g01626163

The all wheel drive switch on the Backhoe Loaders that are listed above may fail. Contamination in the all wheel drive solenoid may cause the all wheel drive to not engage.

Solution

1. Move the machine to a smooth, horizontal location. Move the machine away from other operating machines and away from personnel.

2. Lower the work tool to the ground. Stop the engine.

3. Engage the parking brake.

4. Place chocks in front of the wheels and behind the wheels.

5. Turn the engine start switch key to the ON position.

6. Place the battery disconnect switch in the RUN position.

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Illustration 2	g01626218
(2) Location of the all wheel drive solenoid

7. Install two 7X-1709 Multimeter Probes onto the test leads of a multimeter. Install the two 7X-1709 Multimeter Probes onto the two pin of the DT connectors on the all wheel drive solenoid.

8. Place all wheel drive switch (1) in the ON position.

9. You will need to confirm that 12 volts are detected by the multimeter at all wheel drive solenoid (2) .

10. Place all wheel drive switch (1) in the ALL WHEEL DRIVE BRAKING position.

11. Lock both brake pedals. Depress both brake pedals in order to activate the brake lamps.

12. You will need to confirm that 12 volts are detected by the multimeter at all wheel drive solenoid (2) when both brake pedals are depressed simultaneously.

13. Release the brake pedals.

14. Confirm that voltage does return to zero at the all wheel drive solenoid (2) when one or both brake pedals are released.

15. Place all wheel drive switch (1) in the OFF position.

16. Check all wheel drive solenoid (2) in order to make sure that there are zero volts at all wheel drive solenoid (2) .

    Note: If twelve volts are measured at all wheel drive solenoid (2) during Step 9 and Step 12 and zero volts are measured during Step 14 and Step 16 then the electrical circuit is functioning properly. The circuit includes the all wheel drive switch and the relay.

The list that is shown below lists the possible causes for the all wheel drive to malfunctioning.

• A pin at the two pin of the DT connector may not be making contact with the connector.

• The all wheel drive solenoid may be contaminated. The solenoid will need to be replaced and the source of the contamination will need to be corrected.