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Im a little surprised, seeing as Briggs owns Ferris/Simplicity, that They would put the Cat Diesel in the Biggest Z they offer, instead of the Vanguard Diesel.
The IS-5100 is a Hoss though, Considering it is 8K more expensive than a Cobalt, has much more power, a 72" optional deck, Diesel engine, 2mph ground speed, Id expect it to really topple the 5.1 acres per hour capability the Cobalt has..
Ultra, Im assuming you are a Ferris Dealer. Are you having trouble with the Front wheels being deleivered without any grease in them? WE had a Simp come back a day after it was sold, both frotn wheels were barely rolling..Tapered bearings on one side of both wheels were toast. Of course we put grease in al lthe fittings for sales prep, and sure enough when I pulled the wheels off the casters and knocked out the seals and the little metal bung things the bearings ride on, one bearing was covered in grease, it was the one nearest the grease fitting, and the other bearing was clean and dry...identical on both wheels. New bearings, hand packed all the bearings, put it together and good as new...just looks kinda bad with that happening to a new mower.
All the ferris's we sell are fully greased & leveled before they are sold. A few years back we had a customer buy two ferris hydrowalk mowers from a dealer up the road cause they were a few dollars cheaper. They did not last a day when all the spindles burnt up from no grease. Ferris at the time barely greased anything out of the factory and the only prep the dealer did to the unit was put a JD Dealer sticker on it.
Ferris lists the IS5100Z at 7.2 Acres per hour (80% Efficiency). We've sold some of the IS5000Z/IS5100Z but for the price tag you're better off upgrading into a Ventrac http://www.ventrac.com. Our most popular Zero Turns are the IS4500Z, IS3100Z, IS2000Z, and the IS1500Z for homeowners or light commercial.
http://www.ferrisindustries.com/pages/models.php