RETAINER 5380149 - Caterpillar

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This illustration shows a base plate with a retainer. (1) Retainer (8) Cover dovetail
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(2) Impact from the cover dovetail
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(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.
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(A) Bucket forces on cover and retainer during loading (5) The retainer is mounted in the forward position.
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(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.
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(7) Preferred base side position on loader
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(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.