Typical chain damage and its causes



1. Major wear on the rear running face of the cutting teeth and on the opposite tie straps Cause: Blunt cutting edge dropping too steeply to the rear, chain too slack, depth gauge possibly also too low. Prevention: Sharpen cutting teeth correctly, tension chain correctly.		2. Major wear on the running face of all chain links Cause: Chain tensioned excessively, depth gauge too high, blunt cutting edge with excessively small filing angle and therefore excessively high pressure on the guide bar. Prevention: Sharpen cutting teeth correctly, tension chain correctly.



3. Cracks under the rear rivet hole of the cutting teeth and of the opposite tie straps Cause: Blunt cutting edge dropping too steeply to the rear, with the result that too much pressure is applied when cutting. Prevention: Sharpen cutting teeth correctly, tension chain correctly.		4. Battered bar rails at the inlet at the top and at the end of the sprocket nose at the bottom; underside of bar is wavy. Chain does not run smoothly, wear increases rapidly. Cause: Chain too slack for a long time, unserviceable. Prevention: Retension chain regularly.

Chainsaw Facts - Did You Know That....

A chainsaw piston goes up and down in the cylinder 20,000 times per minute.

The piston ring speed on the average chainsaw travels 2,500 surface feet per minute.

A chain slides across the surface of the sawbar rail at around 5000 feet per minute.

The chain is moving at 55 to 60 m.p.h. or a mile per minute ( 88 feet per second ).

The drive links impact the sprocket an average of 1,300 times per second.

The chainsaw bar sprocket rotates nearly 1 million times daily when saw milling so grease that sprocket daily .

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