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Hakki 37 expert chain bar bending


phill1
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Good afternoon, I’ve borrowed a hakki 37 expert firewood professor but I’ve been having a few issues with it. After cutting a m3 of firewood with it the bar bent and refused to cut. I replaced the bar and the same thing happened again. The bend is difficult to see. I have been careful using the machine and have not jammed of caught the bar in anyway, I can’t see what I’m doing wrong. Any ideas? 
 

thanks

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Trying to work out how you would bend a bar lengthways then. Into the wood and not going straight down but a very gentle curve maybe? With the lever probably applying enough pressure to bend the bar? maybe? Left to right bend of right to left would suggest the direction of the curve but my head is hurting trying to work out which way it is bending

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