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jimNCal
03-07-2006 23:11:21
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Re: Curious ,Hi -Low tranny in reply to Richard from SE AZ, 03-07-2006 12:41:54
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Shermans install in the tractor's 'bellhousing', taking the place of the long shaft between the clutch and the front of the regular/main trans so they didn't change the tractor other than the evidence of the handle. Used to give a wider range of gears for road, hills, or creeping around tight places. They came in several configurations. Overdrive only, underdrive only, "3 speed"'Combination'(O/D,U/D, & straight thru), reversing, and creeper. Since the PTO on the 'N's is transmission driven, PTO speed/gearing is changed in relation to the groundspeed also. A distinct disadvantage when attempting to lower ground speed to accommodate PTO driven implements such as tillers and mowers. Howard Hoes of England made a planetary gear set-up (ratio 3.5:1)that installed BEHIND the regular trans that went into the rear housing to solve this problem. Again, NO evidence of these other than the external handle. Later models of Howards for the 01/1000's DID lengthen the tractor by a few inches as they were a LOT more stout and used plates the full size of the rear gasket. The trencher Aux trans mentioned that lengthens the tractor (by almost 10")was made by Everett and also went behind the main trans. Gear ratio is 98:1(slooooow..). At least half a dozen companies made their version of the Sherman idea but Sherman was first, most common, and lasted the longest so they are the 'easiest' to find. So..Aux trannies for every want or need. Some here would say "just another thing to go wrong on the tractor with no real purpose or advantage". Others, such as myself, regard ours as an indespensible part of the whole machine and wouldn't be without one. Evidence of the latter is the rather hefty prices we get/give for them when we buy, repair, sell. Probably way more on Shermans than you wanted to know....sorry if I got windy here guys. jim
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