14H Motor Grader Caterpillar

Blade Circle and Drawbar

1. Rotate the blade. Place the blade at an angle of 90 degrees to the frame.

Note: Install the C-clamps before you lower the blade to the ground.

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Illustration 1	g00108086

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Illustration 2	g00274283

2. Clamp two C-clamps onto the front of the blade circle (1) and the drawbar (2) . This will fasten the blade circle and the drawbar together. Tighten the two C-clamps until the wear strips (3) are in contact with the top of the blade circle and the wear strips (3) are in contact with the bottom of the drawbar.

3. Lower the blade to the ground. Stop the engine.

4. Measure the distance (A) that is between the top surface of the blade circle and the bottom surface of the drawbar. Replace the wear strip (3) , if the distance between the top surface of the blade circle and the bottom surface of the drawbar is less than 1.5 mm (.06 inch).

5. Inspect the wear strip (3) . Inspect the drawbar. The wear strip (3) should be in complete contact at all points with the blade circle. If the wear strip (3) is not in complete contact with the blade circle, replace the wear strip (3) .

Blade Circle to Shoe Clearance

1. Rotate the blade. Place the blade at an angle of 90 degrees to the frame.

   Note: Install the C-clamps before you lower the blade to the ground.

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Illustration 3	g00108086

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Illustration 4	g00270571

2. Clamp two C-clamps onto the front of blade circle (1) and drawbar (2) . Tighten both C-clamps until the wear strips (3) contact the top of the circle and the bottom of the drawbar.

3. Lower the blade to the ground. Stop the engine.

Note: Check the wear strips (3) around the entire circumference of the blade circle. The wear strips (3) should be in complete contact with the blade circle and the drawbar.

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Illustration 5	g00108090

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Illustration 6	g00270573

4. Shoe mounting fastener (4) , shoe mounting fastener (5) , and shoe mounting fastener (6) must be tight. Make sure that the shoe wear strips (3) are seated in the circle shoes.

5. Measure the clearance (B) between the bottom of circle (1) and the top of shoe wear strip (7) . Maintain an approximate clearance of 0.5 mm (.02 inch). Maintain the proper clearance by adding shims (8) or by removing shims (8) .

   Note: The proper clearance will permit the blade circle to rotate for 360 degrees.

   Adjust the circle shoes (9) one at a time.

6. Loosen shoe mounting fastener (6) . Remove shoe mounting fastener (4) and remove shoe mounting fastener (5) .

7. Add shims or remove shims, as required.

8. Install shoe mounting fastener (4) and install shoe mounting fastener (5) . Tighten the shoe mounting fasteners.

9. After all circle shoes (9) have been adjusted, check circle shoes (9) for proper clearance. If necessary, perform adjustments to the circle shoes (9) .

   Note: After all the adjustments have been performed, the blade circle (1) must rotate freely without binding .

Circle Pinion and Circle

Note: The engagement of the circle pinion and circle teeth is determined by the adjustment of the circle shoes. Clean the circle and the pinion. Remove any dirt and any abrasive material. This will reduce wear to the circle pinion and to the circle teeth. Also, this will improve the accuracy of the adjustment of the circle shoes. After the adjustment, apply clean lubricant to the circle pinion and to the circle teeth.

1. Rotate the blade. Place the blade at an angle of 90 degrees to the frame. Lower the blade to the ground. As you slowly inch the machine in a forward direction, apply the service brake. This will hold a light load between the wear strips for the front circle shoes and the circle. Engage the parking brake. Stop the engine.

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Illustration 7	g00110066

2. Measure the clearance that is between the bottom flange of pinion (10) and the inner machined surface of circle (1) . If the clearance is less than 59.5 to 62.5 mm (2.3 to 2.5 inch), then adjust the clearance.

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Illustration 8	g00108098

3. Loosen shoe mounting fastener (4) , shoe mounting fastener (5) , shoe mounting fastener (6) , and locknuts (11) on the front circle shoes.

4. Loosen the shoe mounting fasteners and the locknuts for the rear circle shoes.

5. Loosen the shoe mounting fasteners and locknuts for the side circle shoes, if equipped.

6. Adjust the front circle shoes one at a time. Turn the adjusting bolts (12) inward or turn the adjusting bolts (12) outward in order to attain 59.5 to 62.5 mm (2.3 to 2.5 inch). Adjust the other front circle shoe.

   Note: If the circle shoes are moved outward, it may be necessary to inch the machine in a forward direction in order to place a light load between the wear strips for the front circle shoes and the circle.

Note: Adjust the front shoes so that the front circle shoes have the same clearance measurement.

7. If you cannot attain the correct clearance measurement due to worn front shoe wear strips (7) , replace the worn shoe wear strips (7) . Then, repeat Step 6.

8. Tighten the shoe mounting fasteners and locknuts for the front circle shoes.

   Note: The adjusting bolts must be tight against the circle shoes before you tighten the mounting fasteners and the locknuts.

9. Set all of the circle shoes (front, side, and rear) to contact the circle. There will be no clearance between the circle shoes and the circle.

10. Tighten all shoe mounting fasteners (4) , shoe mounting fasteners (5) , and all shoe mounting fasteners (6) to a torque of 475 ± 60 N·m (350 ± 44 lb ft).

11. Tighten all locknuts (11) to a torque of 200 ± 30 N·m (150 ± 22 lb ft).