Our girth gear specialist team conducts gear inspections and risk assessments based on the inspection recommendations outlined in the annex of AGMA 6014. Part of this inspection is a visual and photographic inspection of the teeth, recording damage in accordance with the terminology outlined in AGMA 1010-F14. With the introduction of ASTM E2905 an improved cleaning and tooth inspection method is available that quickly detects and accurately maps surface breaking indications and cracks on gear teeth. Inspections per ASTM E2905 are powerful standalone inspections, but when combined with classic inspections per the inspection recommendations in AGMA 6014 the result is a complete snapshot of the girth gear system’s condition.

"Our capabilities are in the engineering, design, manufacture, installation, inspection and maintenance of large girth gear systems”

Combining E2905 into our inspections has enabled Global's team to refine our girth gear risk assessments and add clarity to our asset management recommendations helping our customers make informed condition based decisions. This practice standardizes the inspection method for large ring gears and pinions, delivering consistency, efficiency and standardization ‐ a service valued worldwide. With the correct preparation, the gear set will take approximately five to six hours to inspect.

Girth gear cleaning program is in compliance with ASTM E2905 and AGMA 919-1-A14. Global uses Cleansolv HF EP for excellent results. Safely cleaning a 40’ diameter SAG mill gear under production takes approximately 1 hour. Excellent for removing contamination and lubrication buildup in the root of gear teeth and allows for a complete visual inspection. Pinion changeouts are cleaner to work with.

American Gear Manufacturers Association (AGMA) recognizes ASTM E2905 as an accepted method of gear teeth inspection in AGMA 919‐1‐A14, Condition Monitoring and Diagnostics of Gear Units and Open Gears. ASTM E2905 is the only standard practice currently available that is specific to addendum, dedendum and root on the drive and non-drive sides of mill gear teeth.  


Our assessment will provide the customer with a complete non-destructive test of the integrity of the mill gear teeth in accordance with ASTM E2905. It also includes an onsite engineering assessment of the failure modes present, if any, their severity, and how these might impact the operational function of the mill. Our assessments include a conditional probability of failure analysis to aid in the decision of whether to replace, flip, or continue running a particular gear set.

If mechanical misalignment is detected during the inspection, the magnitude and direction of the required adjustment will be determined. The adjustment can be overseen onsite however additional time may be required.

Reporting Format:

The information is presented in a report in accordance of the terminology outlined in AGMA 1010-F14. Notable anomalies are summarized in the Analysis Report Table and Summary within the report. The actual complete scanned data is archived and will be maintained on a secure server to ensure the availability of the data if required in the future.


Inspection Parameters:


Part 1: Cleaning (1 hour)

  • Cleaning the girth gear and pinion with Cleansolv HF EP.

  • Removing built-up contamination, allowing for an accurate visual inspection and to ensure an accurate scan. Cleansolv is formulated to protect the gear while cleaning.

Part 2: ASTM E2905 and visual tooth Inspection with tooth condition report based on AGMA 1010 (equipment must be shut down, locked out, inching drive available, and guarding removed) (5-7 hours)

  • Gear and Pinion Tooth Inspection per ASTM E2905. Scanning both the drive side and the non-drive side flank and root of each tooth on the girth gear and pinion. Onsite data analysis for immediate results.
  • Visual inspection of each tooth identifying specific failure modes per ANSI/AGMA 1010-F14.

Part 3: Dynamic Inspection Prior to Cleaning (0.5 – 1.0 hours)

  • Thermal imaging and video of the operating pinion, and gear.
  • Stop action photographs of the operating pinion and gear teeth.

Optional Services if requested by Customer:

Part 4: Static Inspection (Completed during E2905 Inspection) (2 hours)

  • Split joint gap will be inspected at this time.
  • Root clearance will be inspected at 4 locations approximately 90 degrees apart on the ring gear.


Part 5: Pinion Alignment (Only done if misalignment is indicated) (Add 2-8 hours depending on severity and ease of adjustment.)




e2905 home

Using E2905, discontinuities cannot be missed. The gear flank and root are scanned in one pass.

Electronic reports that can be archived for future reference. Recognized in AGMA 919-1-A14 as an accepted method for gear inspection.

Our experienced and qualified technicians make Global the choice for third party inspections.

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