What are the specifications for this product and is there a more economical alternative?
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Ariens Special Gear Lube L2
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Model 924050 sn 81,000+ uses Mobil Monolith AW00 grease (Ariens Liquid Grease pn 000072). The lubricant used has nothing to do with the casting or gear materials, it's mostly the gasketing and sealing features. Units that use a gasket to seal the casting halves may have a hard time sealing when a gear oil is used. When Ariens switched to Loctite 518 anaerobic sealant (in place of the paper-based gasket), it allowed for a better seal to facilitate gear oil. The gear oil is a bit better for the application (given the increased heat and localized stresses of a high-torque worm gear set).
The worms used for all snow gearcases since the helicon gearcases of 70's use cold-formed high carbon steel worms and machined C673 manganese silicide bronze gears. The only exception is an aluminum gear on the early 90's Metro units (937,XXX series units), but this unit had a rubber auger that was not capable of overloading the gear. Aluminum worms or gears would not last long on a conventional 2 stage snothros unless -very- expensive alloys were used.
krislu and snowshoveler,
The new cast iron gearcases do indeed forgo the tapered roller bearings for bronze bushings. However, given the improved gear design, the oil bath and operating RPM's, tapered roller bearings are not necessary. Note also that the failure mode for most worm gearcases, bushings or otherwise, is that they overload and facture or run dry. They typically do not wear out from operation.
The new CI gearcase is basically an XS gearcase with a stronger Cast Iron housing. The XS gearcase is the most heavily tested component assembly on large Ariens snow units. Countless gearcases were abused over a span of twice the operating life. Immediately after this test they were subjected to multiple simultaneous 4 shear-pin ruptures. Often times the 13hp engines that we tested with would snub out completely. When dismantled for inspection, the bushings were in near-new condition with only minor abrasion marks. The former CI gearcase did not pass this abusive test (nor would most worm gearcases).
The new CI gearcase is superior to the former CI gearcase in every way. It's much stronger, runs cooler, less insternal stress, better sealing, simpler, and yes, less expensive.
As a result of projects like this we are able to absorb the 50-75% steel price increases (since 2003) with a unit that is 95% steel without compromising durability or passing price increases on to the customer. Be aware also our durability test requirements for two stage snow units went up this year by by 25% on large units and 50% on compact.
Paul Koltz
Engineering Leader
Snow Products
Ariens Company
The worms used for all snow gearcases since the helicon gearcases of 70's use cold-formed high carbon steel worms and machined C673 manganese silicide bronze gears. The only exception is an aluminum gear on the early 90's Metro units (937,XXX series units), but this unit had a rubber auger that was not capable of overloading the gear. Aluminum worms or gears would not last long on a conventional 2 stage snothros unless -very- expensive alloys were used.
krislu and snowshoveler,
The new cast iron gearcases do indeed forgo the tapered roller bearings for bronze bushings. However, given the improved gear design, the oil bath and operating RPM's, tapered roller bearings are not necessary. Note also that the failure mode for most worm gearcases, bushings or otherwise, is that they overload and facture or run dry. They typically do not wear out from operation.
The new CI gearcase is basically an XS gearcase with a stronger Cast Iron housing. The XS gearcase is the most heavily tested component assembly on large Ariens snow units. Countless gearcases were abused over a span of twice the operating life. Immediately after this test they were subjected to multiple simultaneous 4 shear-pin ruptures. Often times the 13hp engines that we tested with would snub out completely. When dismantled for inspection, the bushings were in near-new condition with only minor abrasion marks. The former CI gearcase did not pass this abusive test (nor would most worm gearcases).
The new CI gearcase is superior to the former CI gearcase in every way. It's much stronger, runs cooler, less insternal stress, better sealing, simpler, and yes, less expensive.
As a result of projects like this we are able to absorb the 50-75% steel price increases (since 2003) with a unit that is 95% steel without compromising durability or passing price increases on to the customer. Be aware also our durability test requirements for two stage snow units went up this year by by 25% on large units and 50% on compact.
Paul Koltz
Engineering Leader
Snow Products
Ariens Company
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