Noise management data sheets: Edgers
Contents
1. Introduction
Edgers are used in most Government establishments that have lawns and employ gardeners. Edgers can be used for long periods of time and can exceed 90 dB(A). Hearing protection is required for operators of edgers.
2. Maintenance
- Ensure all covers are securely fastened. Check for rattles.
- Check that the muffler is in good condition (no holes) and is bolted firmly to the side of the engine.
- Operate the throttle control and make sure that it is in good working order and regulates the revs of the machine in a smooth manner. Some edgers (mostly Victa Tilta cuts) have a plastic carburettor body and if not serviced regularly, can suffer from a sticking cam and lifter assembly within the carburettor.
- The blades should be free running (not hitting against guards) and not worn down.
- Maintain services to edger to ensure efficient running and easy starting.
Note: Machines that do not operate efficiently require higher revs and make more noise.
3. Noise control
- The noise level of a four stroke (Briggs and Stratton powered) engine can be reduced by fitting a "Low Tone" muffler to the engine. These mufflers reduce the noise level by approximately 3 dB(A) more than the standard muffler and are available from most mowing equipment suppliers.
- Early "Victa Tilta-Cut" engines can be quietened by fitting "Hushtone" mufflers. These are available from Victa and can be retrofitted to all models from 1980 onwards. These mufflers are believed to reduce noise levels by 2dB(A) more than the standard ones. They can be identified by a "Z" under the Victa name stamped on the muffler. All Victa models from 1992 onwards are fitted with this muffler as standard.
- Alternatively, it is possible to experiment with filling an existing muffler with stainless steel metal matting material (similar to scourer pad). However this may not have the same effect as a factory designed muffler unit.
4. Operator control
- Do not "over rev" machine - use only enough power required to perform work.
- Mark normal operating revs on throttle control.
- Avoid hitting curbs with blade.
- Ensure staff are adequately trained in correct use of the edger.
5. Alternatives
- Use manual methods such as a spade or step on type edger where possible.
- In some country locations gardeners have reported that use of a herbicide such as "Roundup" (a gycophosphate) has resulted in the edger being no longer used. In this process the grass overlapping a path is poisoned with a spray. A neat edge can be achieved with practice.
- On replacing the edger, specify and purchase a four-stroke edger (these tend to be quieter) fitted with a low tone muffler. Test run several edgers and take the noise levels into consideration when making your final choice.
Adapted from the Noise Control Manual for Schools with the permission of the Education Department of Western Australia.