2009/04/27 Preferred Positions for Mechanically Attached Wear Plates (MAWPS) {6100, 6120, 6820} Caterpillar


Preferred Positions for Mechanically Attached Wear Plates (MAWPS) {6100, 6120, 6820}
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2009/04/27 [SEPD0989]
WORK TOOLS
BUCKET GP
2009/04/27 Preferred Positions for Mechanically Attached Wear Plates (MAWPS) {6100, 6120, 6820}
Excavator:
  • All
    Off-Highway Truck/Tractor:
  • All
    Track-Type Tractor:
  • All
    Wheel Dozer:
  • All
    Wheel Loader:
  • All
  • It has been stated that the Mechanically Attached Wear Plates (MAWPS) can be mounted in any position on earth moving structures that require protection from abrasion. However, one of the positions allows cover loads to be directed against the retainer. Exceptionally high cover loads could damage the retainer. Exceptionally high cover loads can also bend the retainer. A bend to the retainer can result in the following:

    • Difficulty in removal of the retainer

    • The loss of a cover due to the breaking of the retainer




    Illustration 1g01891874

    This illustration shows a base plate with a retainer.

    (1) Retainer

    (8) Cover dovetail




    Illustration 2g01891953

    (2) Impact from the cover dovetail




    Illustration 3g01892083

    (3) Crack on the retainer

    (4) Distorted portion of the retainer

    Usually, rotating the base 180 degrees will provide adequate support for the contact between the cover dovetail and the base. There is an application with large loader buckets when rotating the base 180 degrees may not prevent damage to the retainer. This application is back dragging, in order to clean the floor of the pit. Even though the retainer is away from the bucket loading forces, back dragging changes the direction of the forces on the cover. This will cause the retainers to get loaded.




    Illustration 4g01893773

    (A) Bucket forces on cover and retainer during loading

    (5) The retainer is mounted in the forward position.




    Illustration 5g01893814

    (B) This shows the load on the cover and the retainer when the bucket is back dragging.

    (6) The base is rotated 180 degrees in order to stop the bucket loading forces on the retainer.




    Illustration 6g01894178

    (7) Preferred base side position on loader




    Illustration 7g01894393

    (C) This shows the minimum clearance between covers to be 51 mm (2 inch).

    The best load characteristics can be achieved by positioning the base at 90 degrees and allowing at least 51 mm (2 inch) clearance for the covers to be installed and removed.

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