120M, 12M, 140M and 160M Motor Graders Caterpillar

Introduction

The following procedure is used to check the wear of the final drive thrust washer.

Check Preparation

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Personal injury or death can result from improper lifting or blocking. When a hoist or jack is used to lift any part or component, stand clear of the area. Be sure the hoist or jack has the correct capacity to lift a component. Install blocks or stands before performance of any work under a heavy component. Approximate weights of the components are shown. Clean all surfaces where parts are to be installed.

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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. Prevent possible injury by performing the procedure that follows before working on the machine.

1. Park the machine on a level surface.

2. Apply the service brake in order to stop the machine. Move the transmission control lever to the NEUTRAL position.

3. Move the speed control lever to the LOW IDLE position.

4. Engage the parking brake.

5. Stop the engine.

6. Turn the engine start switch to OFF position and remove the key.

7. Turn battery disconnect switch to the OFF position.

Check Procedure

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Illustration 1	g06221410
View of the space between the cat walk and the enclosure

1. With the machine on level ground, record the distance from the enclosure to the edge of the walkway (A).

   Note: Make sure that the implements are raised so that the machine weight is fully on the tires.

2. Raise the back of the machine into the air. Using the same reference points on the enclosure and the walkway, record dimension (B).

3. Subtract the value found in Step 1 from the value found in Step 2, and record the difference. The difference is the tandem sag measurement.

4. If tandem sag measurement reaches the measurement provided in Table 1, schedule an immediate rebuild to prevent square or top hat housing damage.
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   Table 1

   Model	Tandem Sag
   120M	7.5 mm (0.30 inch)
   12M	7.5 mm (0.30 inch)
   140M	7.5 mm (0.30 inch)
   160M	8.0 mm (0.31 inch)

5. Repeat this process on the other side of the machine.