We always had 2-3 spare bars when we went out for a day of cutting. I cut thousands of acres in my youth when I worked on a ranch in B.C.'s Cariboo country during the mid-60s. Pretty much obsolete in today's high-power, high-production world but when conditions are right you can still put a lot of hay on the ground with an old bar mower. I was going to quiz my dealer on Monday, just wondered if we have hay experts. One I have left has curve in knife plate, probably should get new. The original owner had 4 blades over the years, one was broke off a foot, one bent, took the arms off and tossed. A couple ujoints are oem and have a bit of play but minor considering it took 40 yrs of regular use to get that way, still serviceable and the minor easy hours I put on will be insignificant but I figure a sharp knife cant hurt. Rest of the thing looks in good shape, washed a ton of grease off the drive side, will check/change lube and maybe a new belt. I see you can sharp the knives but am going to replace them on one bar, the use/load I have is minimal, mostly a day or 2 a year but its got to go. Have one that is about serviceable but want to make a spare. I knocked the knives off of one bar I had, stole a pitman arm end off of another. I know nothing about hay tools, seems I seen someone straighten guards on the cutter bar, I need to buy a couple spare, wonder where on the net there was info, the manual doesn't go in to detail about servicing blades beyond sharpening.
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