303.5E2 CR, 304E2 CR, 305E2 CR and 305.5E2 CR Mini Hydraulic Excavators Boom, Stick and Bucket Operation Caterpillar


Boom, Stick and Bucket Operation
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303.5E2 CR, 304E2 CR, 305E2 CR and 305.5E2 CR Mini Hydraulic Excavators [SEBU9202]
IMPLEMENTS
BOOM GP
1.1. Digging
2.1. Lifting Objects

Digging

  1. Lower the blade to the ground in order to ensure better machine stability while you are digging.

  2. Position the stick at a 90 degree angle to the boom.

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


    Illustration 1g00394783

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

  5. 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.

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

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

  8. Continue the pass in a horizontal direction so that material peels into the bucket.


    Illustration 2g00394917

  9. Close the bucket and raise the boom when the pass has been completed.

  10. Engage the swing control when the bucket is clear of the excavation.


    Illustration 3g00394937

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

Lifting Objects

------ WARNING! ------

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


------ WARNING! ------

When lifting a load with the blade on the ground, do not raise the blade once the load has been lifted. This action may cause instability and sudden movement of the machine and of the object that is being lifted.

Sudden movement of the machine or the lifted object can cause personal injury.



NOTICE

Damage to bucket cylinder, bucket or linkage could result if slings are placed incorrectly.


Short slings will prevent excessive load swing.

Note: There may be local government regulations about the use of excavators for the lifting of heavy objects. Please comply to those regulations.

Only use the lifting point (if equipped) that has been supplied on the power link in order to lift objects. Lifting capacities are calculated from this point. Adjust to this capacity accordingly. Refer to Operation and Maintenance Manual, "Lifting Capacities" for more information on lifting objects with the machine.



Illustration 4g01216478

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. Lower the blade to the ground in order to increase the stability of the machine.

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

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

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

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