Thread: Maxi drive reduction gears

Originally Posted by crump

Finally got to use them in anger on the weekend and was very happy BUT they howl like a hyena (for those that have never heard a hyena howl, think frozen dog and chainsaw). Supposedly Cog cognisant folk I have spoke to have said that is due to the new gear meeting the slightly worn gear.What are the experiences of other installees?

Crump IIRC they are straight cut gears, therefore not any different in design to reverse gears in most vehicles. Is it a similar noise?
Helical cut gears are almost silent by comparison.
JC

Originally Posted by crump

Finally got to use them in anger on the weekend and was very happy BUT they howl like a hyena (for those that have never heard a hyena howl, think frozen dog and chainsaw). Supposedly Cog cognisant folk I have spoke to have said that is due to the new gear meeting the slightly worn gear.What are the experiences of other installees?

I had the 30% reduction gears. They whine because the new low range gear set use spur gears (straight cut), unlike the original helical gears.

There are 2 new gears for low range. Whoever said there was a new gear meshing with a slightly worn gear is talking out of where the sun doesn't shine.

yep sounds like reverse whine just louder, so its normal??

My 49% gears are getting finished off as we speak!!!

Yes i'm afraid they are quite noisy

JC

Originally Posted by isuzurover

My 49% gears are getting finished off as we speak!!!

Thought you were getting 30%? Make sure you specify loudly, I asked for 49% and got 30% anyway, too late when the box was back here.

Originally Posted by crump

Thought you were getting 30%? Make sure you specify loudly, I asked for 49% and got 30% anyway, too late when the box was back here.

I asked for 49% - we will see what turns up. I have to grind part of the case down to only 3mm thick to fit the 49% gears!!!

You get used to the noise - or turn the radio up.....