320D Excavator Boom, Stick and Bucket Operation Caterpillar

Digging

Illustration 1	g00101523

1. Position the stick at a 70 degree angle to the ground.
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   Illustration 2	g00101525

2. Position the bucket cutting edge at a 120 degree angle to the ground. Maximum breakout force can now be exerted with the bucket.
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   Illustration 3	g00101526

3. Move the stick toward the cab and keep the bucket parallel to the ground.
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   Illustration 4	g00101527

4. If the stick stops due to the load, raise the boom and/or perform a curl in order to adjust the depth of the cut.

5. To apply the greatest force at the cutting edge, decrease the down pressure as you move the stick toward the cab.

6. Maintain a bucket attitude that ensures a continuous flow of material into the bucket.

7. Continue the pass in a horizontal direction so that material peels into the bucket.
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   Illustration 5	g00101528

8. Close the bucket and raise the boom when the pass has been completed.
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   Illustration 6	g00101529

9. Engage the swing control when the bucket is clear of the excavation.
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   Illustration 7	g00101530

10. To dump a load, move the stick outward and open the bucket in a smooth motion.

Lifting Objects

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To prevent injury, do not exceed the rated load capacity of the machine. If the machine is not on level ground, load capacities will vary.

There may be local regulations and/or government regulations that govern the use of machines which lift heavy objects. Obey all local and government regulations.

Short slings will prevent excessive load swing.

Illustration 8	g00101531

Use the lifting eye that is provided on the linkage to lift objects.

If the lifting eye is used, the connection must be made with a sling or with a shackle.

Illustration 9	g00101532

An unstable condition can exist if a load exceeds the machine load rating or if a heavy load is swung over an end or over a side.

Illustration 10	g00101533

The most stable lifting position is over a corner of the machine.

Illustration 11	g00101534

For the best stability, carry a load close to the machine and to the ground.

Illustration 12	g00101535

Lift capacity decreases as the distance from the swing centerline is increased.