AEM outlines five tips to reduce harvester head chain shot risk 
The hydraulically driven chains cut with great power and speed. When a chain breaks, if a resulting whipping action projects a chain shot link, the link often has a mass, velocity and resultant energy, in some cases enough to reach an operator in a cab, which has potential to cause damage, harm or severe injury. AEM offers the following safety tips to help advance chain shot safety.
- Correct machine settings: Follow the recommended settings of the machine and attachment manufacturer. Operator manuals provide safe operating guidance. This should include hydraulic settings. Out of spec pressures and speed adds considerable strain, which can contribute to the risk of chain failure. Follow the recommended guide bar feed load and linear speed recommended for the chain. Maintain the bar force according to manufacturer specifications.
- Check every chain before and after sharpening: Always use high quality chain recommended for the attachment. Inspect each chain before mounting. Look for link pin wear, signs of strain, and accidental damage during sharpening. Discard questionable chains.
- Avoid habits that risk chain damage: Keep the saw above the ground. Remove chains at the first sign they need sharpening. Dull chains place more stress on the links. Be sure that the head is equipped with a “chain catcher” and “energy absorbing shot guard”, which greatly reduce chain shot hazards. Inspect the shot guard and chain catcher with every visit to the attachment. Replace or repair as needed.
- Know and respect the “shot cone”: The likely path of shot or “shot cone” is the area of most danger as it represents the most likely route of chain shot travel. The shot cone follows the plane of the bar in both directions so all in the shot cone are at risk. In use, orientate the attachment so the “shot cone” is pointed away from you and other machine operators, co-workers, or bystanders. Check that no persons in the shot cone area are masked from your sight. Know where the chain shot zone is relative to the bar and chain; don’t align to look directly down the bar during cuts!
- Care for the cab windows: Cab windows that can be exposed to the “shot cone” should meet the appropriate requirements to serve as effective guards. Don’t make unauthorized modifications to the glazing or the mount, and follow appropriate maintenance procedures. Some cleaners are not suitable for many window materials.
Source (Image source: Blount International)