While the Ariens ATC differential does have traction control functions (relative to an open differential), it's main function is indeed for steering assist. With large heavy units, the primary resistance for turning is the fact that at least one wheel has to be dragged to get the unit to turn (with a locked synchronous axle). The ATC unlocks the axle during the turn and over-runs the outer wheel making it easier to turn. It then re-locks when the turn is complete (hence the first term "Automatic" in the ATC designation). Intuitively it would be better for the wheel on the interior of the turn to stall or unlock while the outer wheels drives, but the unit cannot function in this manner.
Snowmann, I have read various opinions about how the ATC works. Everything from that it powers ONLY the inside wheel while the outer wheel is completely without power, thus requiring "muscle" to turn the unit until the turn is complete, to how hard it is to turn in general. Knowing that Ariens has had a true differential available on many models over many years where BOTH wheels have power even during a turn, the action has always been very smooth and easy. I have used an Ariens ST1032 at work, and my son has an Ariens ST824. The differential action on both units is as easy as pie. I assume that the newer ATC still provides that same easy differential function of providing power to BOTH wheels during a turn, NOT killing power to the outer wheel while providing power to only the inner wheel. It's the same differential effect as in the past, but based upon a different mechanical approach internally. Correct, or am I wrong?
I get tired of all the confusion that gets generated about the ATC. If you could confirm clearly if both wheels are powered during turns so everyone finally gets it right, that would be great. Thank you.
I'm aware of the Hilliard AutoLok being used on the Ariens Platinum and Pro models, and the John Deere 1330SE model. For those who would like to see a clip, here it is. Note the Ariens and John Deere blowers sitting side-by-side:
http://productsearch.machinedesign.com/FeaturedProducts/Detail/Hilliard/Hilliard_AutoLok_Differential/108436/0Here's a quote taken directly from Hilliard
: http://www.hilliardcorp.com/drivetrain-clutch.html
Auto-Lok® Differential 
The Auto-Lok Differential is used on the primary drive axle and replaces the limited slip or open differential. It is easily incorporated into existing designs and is being offered as an off-the-shelf item for walk-behind equipment
Applications The Hilliard Auto-Lok can be used as a hydrostatic or conventional transaxle, or stand-alone differential and axle in such products as utility vehicles, garden and lawn tractors, and walk-behind power equipment.
This message was modified Nov 13, 2011 by coasteray
El Toro! 1028 LXE - Tecumseh 358cc 10hp Let it snow! Let it snow! Let it snow!
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