Lawn Mower PTO Clutch Ariens Gravely - 00447100

This clutch is built on the Ogura GT3.5-VP01R - the same GT3.5 architecture family used across the commercial zero-turn market, configured specifically for the Ariens/Gravely 00447100 application. The GT3.5's high-capacity coil and robust armature deliver smooth engagement and fast blade stops - the behavior commercial operators depend on for safe, efficient deck cycling. This is the Ogura platform Ariens Company specified for the Pro-Turn and ZT lines, not a cross-brand adaptation.

OEM-grade torque with aftermarket variants rated at 272 ft-lbs places this clutch in the full commercial torque class - the engagement authority to spin a 52-inch fabricated deck through wet turf and heavy thatch without slip or chatter. The torque capacity is matched to the Pro-Turn's commercial duty cycle: dozens of engagements per shift, sustained blade load, and the thermal demands of 8-to-12-hour operating days. A residential-grade clutch would overheat and slip within the first hour of this duty.

The 1.125-inch bore mates to the large crankshafts on the 24–30 HP V-twins powering the ZT and Pro-Turn platforms, and the 6-7/16-inch pulley provides the belt wrap for the 48-inch and 52-inch fabricated decks. Together they define the commercial fitment class of this clutch - distinct from the 1-inch bore, smaller-pulley clutches on Ariens' residential lines (like the Zoom/Edge family). The CCW rotation matches the Gravely deck belt routing, completing a specification-correct fitment package with no adapters and no modification.

The 00447100 replacement is engineered for field serviceability: a replaceable pulley bearing with high-temperature grease that can be pressed out and swapped when it wears, a 3-layer water-tight replaceable wiring harness that turns a torn-lead failure into a 10-minute repair, and Cool Coil technology that extends coil life through reduced operating temperatures. For fleets running multiple Pro-Turns and ZTs, serviceability converts what would be a full clutch replacement on competitive brands into a bench repair at a fraction of the cost - and the 3-layer harness survives the wash-down and debris exposure of commercial operation.