I think your first picture is a double main. It may be recognized by 1) haulback is closer to the back end of yarder (since it takes the place of the mechanical guyline drum of the tag/line shorterners) and 2) hydraulic guyline winch(es). A double main is working exactly as a tag except it has two similar main drums mounted after each other in front of the winch frame, one of these work as opening line. Drums are placed in the winch frame in the same way as on the 100 series of regenerative swing yarders. Your second picture is a tag machine, most 044 will look like this (also a line shorterner). Most of the 044's delivered from mid seventies are tags, I understand line shorterners mainly were the older series (47000) with the very heavy boom and the very low gantry. Though, #60070 and 71 delivered to MacMillan Bloedells Copper Canyon and Kelsey Bay divisions in 1979 were line shorterners. I may have a picture of the setup on these machines and will publish it here when I find it!
How do you like climbing over the seat system in it?So to make a long story short .The 1423 is the last track 075 built and we got it from Gold River this August to replace the rubber tires one we got from Engle Wood two years ago. The tracked 075 (1468 second to last track on built) that I was running broke the the eye out of the cab side gantry tie back in June of 16. Dropping the snorkel into the ground and bending the the top piece of the gantry and putting a bend in both sections of the snorkle. We put a used top gantry piece and back braces on and boomed up and moved it out of the way. It was decided by upper levels of management to convert the machine into a hyd driven under carriage. All the engineering was done by TMAR but they seem to have problems getting the $1,000,000 needed to do it.So it sits in Port McNeill behind the shop waiting to have this done.The rubber tired one (1560) second to last one built was coming up short in what we really needed in Jeune Landing . Snorkle to short ,70 feet and getting around the 28% plus switch backs they found out Gold River wasn't using theirs much any more so we scooped it. We had it in the shop yard for 5 or 6 weeks working all the bugs out (all kinds of air problems and other older machine fixes) and putting the snorkle together with new guylines and other changes to the snorkle. Took it out for a couple of weeks with just 60 feet of snorkle work out a few of the bugs and then it sat for awhile. Finally got it out in to the woods a month or so back with all the snorkel on it and have been quite happy with it .Has a 23 tooth converter sprocket and is pretty quick on the line speed./And helps with the series 50 flat spot of idle View attachment 176391 View attachment 176391 View attachment 176392 View attachment 176392