2013/10/16 Caterpillar

Off-Highway Truck:

773D (S/N: NBJ1-UP)

773E (S/N: ASK1-UP)

777D (S/N: FKR1-UP)

Description of Change: A new rocker switch for the secondary steering motor is now used on the machines listed above. The new rocker switch with momentary operation improves the service life of secondary steering motor.

Adaptable To:

Illustration 1	g03437516
219-9528 Rocker Switch

The new 219-9528 Rocker Switch replaces the former 170-1331 Rocker Switch. Use the following procedure in order to replace the rocker switch.

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Illustration 2	g03437517

1. Physically check the condition of the new 219-9528 Rocker Switch .

2. Check for continuity while pressing and releasing the rocker switch.

   Note: When pressing, the rocker switch will show continuity between terminal 2 and terminal 3, terminal 5 and terminal 6. The rocker switch should not show continuity between the terminal 2 and terminal 3, terminal 5 and terminal 6 once released.

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Illustration 3	g03437536

3. Turn the ignition and battery disconnect switch to OFF position and remove from the machines for electrical safety.

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Illustration 4	g03437537

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Illustration 5	g03437538

4. Use the sharp edged screw driver to remove the secondary steering manual switch from the dashboard.

   Note: Ensure that the screw driver does not damage the dashboard.

5. Unplug and discard the existing switch from the harness.

6. Plug the new 219-9528 Rocker Switch into the existing harness.

7. Install the new 219-9528 Rocker Switch into the dashboard.

8. Turn the ignition and the battery disconnect switch to the ON position to power up the vehicle system to test the secondary steering system.

9. Sound the horn and ensure that nobody is near the machine.

10. Press the secondary steering switch and make sure that the secondary steering is working properly. Analyze the switch for any abnormalities.