Aluminum vs iron gearbox - Snowblower Forum : Snow Blower Forums
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post #1 of 15 Old 11-11-2017, 12:06 PM Thread Starter
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Aluminum vs iron gearbox

Hi

I suppose internal parts are the same in both gearboxes (926 series) but only the casings are different. Am I right ?

If you use correct shear bolts, is there a reason aluminum gearbox shouldn't last as long as iron box if you use good synthetic gear oil in them ?

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post #2 of 15 Old 11-12-2017, 12:17 AM
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In general the housing matetial is not important.

How many automotive transmissions are made with an aluminum housing?

Not an issue... at all.
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post #3 of 15 Old 11-12-2017, 12:56 AM
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aluminum gearboxs that ive seen all use bushings. cast iron gearboxes always use bearings that almost never wear out as long as you keep the gearbox full of oil. bushing or bearing wear will in many case lead to destruction of the auger gear
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post #4 of 15 Old 11-12-2017, 10:14 AM Thread Starter
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In 926 series, aluminum and cast iron gearboxes use bushings not bearings, It seems both use the same internal parts.
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post #5 of 15 Old 11-12-2017, 11:23 AM
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in 924000 series cast iron uses bearings
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post #6 of 15 Old 11-12-2017, 12:41 PM
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I stand by my first statement... material of construction does not matter. The internals, bearings and gears, and external supports do matter.

Depending on alloy and the casting process alluminum and cast iron have the same practical yeild strength. Either will suffer from poor external support. Full length auger shafts and a rigid steel bucket will impart much less force on the hosing than partial shafts and thin flexible bucket.
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post #7 of 15 Old 11-12-2017, 02:22 PM
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Cast Iron is always the way to go. Awhile back alluminum was used on the ariens snow blowers as a cost cutting move, and they had problems. Now they make a big deal about the cast iron gear case. It's a durability issue. If Alluminum was better that is what they would use. Even the compact Ariens use cast iron now.
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post #8 of 15 Old 11-12-2017, 02:31 PM
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I wonder if it would have made a difference for this guy?


Photo is from a local ad.
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post #9 of 15 Old 11-12-2017, 03:12 PM
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Yes a full length auger shaft may have prevented the external loads from breaking that gear case.

However augers frozen to the output shafts can destroy a cast iron unit just the same. Something has to give...

Last edited by frozenwrench; 11-12-2017 at 03:18 PM.
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post #10 of 15 Old 11-12-2017, 06:47 PM
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Garage
In a "perfect storm" scenario, won't a cast aluminum gearbox rupture before a cast iron one? Granted, it would be one helluva hit...

"It's better to have it and not need it than to need it and not have it."

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