Hakki 37 expert chain bar bending

[phill1]

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

[Steve Bullman]

What make bar? I ran this machine for 5 years and never bent a bar

[GarethM]

Isn't the 37 a manual lever unlike the larger hydraulic ram ?.

[phill1]

It has an Oregon bar 168PXBK095

it has a manual lever. The bends are only slight but enough to stop it cutting

[Steve Bullman]

At what point does it stop cutting? Soon as you cut or near the end of the cut 

[phill1]

It stops about half way through.  The chains spins fine but it refuses to cut The guy I had it off said he’s goes through bars regularly but it can’t be right 

[Steve Bullman]

No something doesn’t sound right.

 

I was going to say check the lever isn’t bent as that was one problem I had with mine. But if he’s going through bars a lot then there’s probably something else going in. I assume it’s oiling right 

[Steven P]

which direction is the bend? top to bottom or lengthwise?

[phill1]

It seams to be oiling fine, the bend is along the length. It’s worse on the bottom of the bar 

[Steven P]

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