AMI Attachments Extreme Service Stick Pivot Hydraulic Thumb
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AMI Attachments Rock Ripper: a ripper tooth excavator attachment for hard, compacted or frozen ground in place of the digging bucket
A ripper tooth such as the Rock Ripper replaces the digging bucket on an excavator arm with a single, massive tooth that is driven into the ground with high tearing force through the boom, arm and bucket cylinder. Unlike a bucket, it does not dig by displacing volume but tears apart material that a normal bucket can no longer break loose.
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With an attachment of this kind, the carrier machine determines the size class: a ripper tooth is chosen to match the operating weight of the excavator it is fitted to, via a quick-coupler plate or pin-on mount, not by any output rating of the tool itself. The excavator supplies all the tearing force through the boom, arm and bucket cylinder, while the attachment itself has no drive of its own.
A ripper tooth is used where ground is too hard, compacted or frozen to be loosened directly with a bucket: breaking up frost-bound ground in winter construction, loosening compacted haul routes, or pre-ripping soft rock ahead of the actual digging with a bucket. After ripping, the operator usually switches back to a bucket to load the loosened material.
When buying a used ripper tooth, the condition of the tip and the wear edge matters most, since this carries the greatest wear and is usually a replaceable part. The bores for pins and bushings at the attachment point to the arm should be checked for play, and the welds on the shank for cracks caused by the high tearing forces. Compatibility of the mount with the existing quick coupler should be confirmed before purchase.
Sources: SpecCodex-Register: Kennwerte des Modells AMI Attachments Rock Ripper
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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Sources: Manufacturer documentation, amiattachments.com (retrieved August 2026) · Dealer data sheet, amiattachments.com (retrieved August 2026) · How we check the data
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