1994/10/31 Caterpillar

New Instrument Panel Groups With Improved Light Bulb Retention Can Be Installed{7451}

Usage:

768C (02X),
772B (64W),
776C (2TK) Tractors;
769C (01X, 1ED),
773B (63W),
777C (4XJ) Trucks;
771C (3BJ),
775B (7XJ) Quarry Trucks

SUPPLEMENT: MAY 18, 1998

Service Magazine SEPD0203; Article 6, Page 7; October 31, 1994; "New Instrument Panel Groups With Improved Light Bulb Retention Can Be Installed" for 768C, 772B and 776C Tractors; 769C, 773B and 777C Off-Highway Trucks; 771C and 775B Quarry Trucks.

NOTE: Service Magazine article listed above was reprinted in Service Magazine; Special Edition; SEPD0325; September 4, 1996; Page 321, "Major Improvements And Service Information For 768C, 772B, 776C, 776D Tractors, 771C, 771D, 775B, 775D Quarry Trucks and 769C, 769D, 773B, 777C and 777D Trucks."

Wiring information for the original article on Page 9, Illustraiton 2 was labeled incorrectly, it should read as follows:

Illustration 2.
Wiring schematic for 768C, 772B Tractors, 769C, 773B Trucks, 771C, 775B Quarry Trucks.

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New instrument panel groups can be installed in the machines listed above. The new instrument panel groups use bayonet mount light bulbs to provide better light bulb retention. The push-in mount light bulbs could come loose from the earlier instrument panel groups. Use the following method and illustrations to install the new instrument panel groups that use the bayonet mount bulbs. The new parts required are shown in the charts.

768C, 772B Tractors, 769C, 773B Trucks, 771C, 775B Quarry Trucks

Illustration 1. Instrument panel group parts location for 768C, 772B Tractors, 769C, 773B Trucks, 771C, 775B Quarry Trucks

1. Remove the front cover from the cab and unplug the instrument panel wiring harnesses from the main cab wiring harness.

2. Remove the six screws that hold the instrument panel group in place. Remove the instrument panel group from the truck.

3. Install the film (3) and gasket (5) on the dash assembly (4).

4. Mark the wiring harness terminal locations on the EMS, gauges, key switch and rocker switches. Disconnect the wiring harness from the original 8X-0892 Dash Assembly.

5. Install the EMS, gauges, key switch and rocker switches in the new dash assembly (4). Connect the new harness assemblies (1 and 2) to the EMS, gauges, key switch and rocker switches.

6. Install the lamps (6 and 7) in the harness assembly sockets. Plug the lamp sockets in the dash assembly as shown in the illustration and chart.

7. Install the new instrument panel assembly in the cab. Use the six original screw to hold the new instrument panel assembly in place.

Illustration 2. Wiring schematic for 768C, 772B Tractors, 769C, 773B Trucks, 771C, 775B Quarry Trucks.

8. Connect the instrument panel wiring harnesses to the main cab wiring harness. Install the front cover.

NOTE: If the machine was not equipped with AETA (Automatic Electronic Traction Aid), there will be wires in the new harness that will not be used.

776C Tractors, 777C Trucks

Illustration 3. Instrument panel group parts location for 776C Tractors, 777C Trucks.