824K Wheel Dozer, 825K Soil Compactor and 826K Landfill Compactor Machine Systems Caterpillar

The software program that will be used for this test procedure is the Caterpillar Electronic Technician (ET). The Caterpillar Electronic Technician is a software program that can be used on an IBM-compatible personal computer.

Introduction

The following procedure is for adjusting the limit switch ( throttle lock deactivation).

The software program that will be used for this test procedure is the Cat ET. The Cat ET is a software program that can be used on an IBM-compatible personal computer.

Reference: For more information about the use of Cat ET, refer to Troubleshooting, "Using Caterpillar Electronic Technician to Determine Diagnostic Codes" for the machine that is being serviced.

Required Tools

Illustration 1	g03404793

Table 1

Required Tools
Tool	Item	Qty	Part Number	Description
C		1	317-7484(1)	Communication Adapter Gp
	C1	1	370-4617	Cable As (USB PC Communication)
	C2	1	317-7485	Communication Adapter III
	C3	1	327-8981	Cable As (Data Link)
	C4	1	317-7492	Cable As Wireless Radio
	C5	1	JERD2129	Caterpillar Electronic Technician (Cat ET)

(1)	Cat Electronic Technician (ET) and Software CD, NETG5057 are required when using the communication adapter.

Test Preparation

Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".

Refer to Testing and Adjusting, "System Pressure Release".

Test Procedure

1. Connect the laptop computer to the service connector in the cab.
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   Illustration 2	g03404797
   Typical example of ET menu

2. Open the software program (ET). Select the engine ECM from the "ECM Selector" menu.
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   Illustration 3	g03404802
   Typical example of ET menu

3. Select the "Information" menu item from the toolbar. Select the "Status" menu item.
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   Illustration 4	g03404803
   Location for the shim

4. Place a 1.55 mm (0.062 inch) shim between the pedal stop and the right-hand brake pedal.
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   Illustration 5	g03404804
   Typical example of ET menu "Depressed" status of the brake pedal

5. Select "Throttle Lock" in ET. If "Depressed" appears in the "Brake Pedal" row under the "Value" column, proceed to Step 10. If "Released" appears, proceed to Step 6.
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   Illustration 6	g03404807
   (1) Limit switch for throttle lock deactivation (2) Adjustment plate (3) Adjustment screw

6. Remove the three screws from the cover plate on the right-hand brake pedal switch in order to access adjustment screw (3).

7. Place a 1.55 mm (0.062 inch) shim between the pedal stop and the right-hand brake pedal.

8. Loosen adjustment screw (3). Adjust adjustment plate (2) until "Deprssed" appears in the "Brake Pedal" row under the "Value" column in ET. Then, torque adjustment screw (3) to 1.4 ± 0.3 N·m (12 ± 3 lb in).

9. Remove the shim from the pedal stop.

10. Place a 0.775 mm (0.031 inch) shim between the pedal stop and the right-hand brake pedal.

11. Verify, "Released" appears in the "Brake Pedal" row under the "Value" column in ET. If "Released" now appears, proceed to Step 12. If "Released" does not appear, repeat Step 6 through Step 10.

12. Remove the shim from the pedal stop.

13. If the cover plate was removed, replace the cover plate with the three screws.