966M and 972M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar

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Personal injury or death can result if two persons are not used in the following procedure.

Introduction

This information includes the following test:

• Limit Switch (Stop Light)

This information includes the following adjustment:

• Limit Switch (Stop Light)

Required Tools

Test Preparation

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Illustration 1	g03117238

1. Move steering frame lock to the LOCKED position.

2. Move the machine to a hard, level surface. The surface must also be dry and free of debris.

3. Engage the parking brake. Turn the ignition switch to the OFF position.

Test Procedure

Illustration 2	g03117243
(1) Plug (2) Adjustment screw

Illustration 3	g03117261
Side view of the left service brake pedal (3) Pedal stop (4) Treadle heel stop

1. Ensure that there is no interference with other components when the brake pedal is applied and released. When the brake pedal is in the released position, the stop lights for the machine should be in the OFF position.

2. Insert a 3.5 mm (0.14 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal. Monitor the stop lights. When the shims are in place, the stop lights should be in the ON position. Remove the shims.

3. Insert a 1.5 mm (0.06 inch) shim between Treadle heel stop (4) and pedal stop (3) of both the left brake pedal and the right brake pedal. Monitor the stop light. When the shims are in place, the stop lights should be in the OFF position. Remove the shims.

4. Ensure that the stop lights go ON and OFF when the brake pedal is applied and released. If the stop lights work properly, no adjustments are necessary at this time.

Adjustment Procedure

1. If steps 2, 3, and 4 are not satisfied, perform the following procedure.

2. Insert a 3.5 mm (0.14 inch) shim between Treadle heel stop (4) and pedal stop (3) in the left brake pedal.

3. Remove plug (1) and turn the adjustment screw for switch (2) counterclockwise in order to turn the stop lights OFF. Then, turn the adjustment screw for the switch clockwise until the stop lights turn ON. When the shims are in place, the stop lights should be in the ON position. Remove the shims. The stop light should go to the OFF position.

4. Insert the 1.5 mm (0.06 inch) shim between Treadle heel stop (4) and pedal stop (3) of the left brake pedal. Monitor the stop lights. When the shims are in place, the stop lights should be in the OFF position. Remove the shims.

5. Ensure that the stop lights go ON and OFF when the left brake pedal is applied and released. Repeat steps 2, 3, and 4 if the stop lights do not work properly.

   Note: If the stop lights will not operate properly after the adjustment procedure, remove the cover for the enclosure. The limit switch may need replacement.

6. Install plug (1). If necessary, install the enclosure cover.