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Author Topic: How to find the gear box ratio  (Read 2980 times)
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offken
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« on: September 08, 2009, 17:34:16 CET »

I have two hurth Hsw 250 A gear boxes in my boat and I would like to know there ratio, the problem is that there is no name plates on them . Can some one tell me how can I find the ratio please .
                                 Thanks
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Granitu
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« Reply #1 on: September 08, 2009, 17:45:58 CET »

normally they are 2:1

the instructors manual should have
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nando_s
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« Reply #2 on: September 08, 2009, 19:17:39 CET »

I have two hurth Hsw 250 A gear boxes in my boat and I would like to know there ratio, the problem is that there is no name plates on them . Can some one tell me how can I find the ratio please .
                                 Thanks

Hi offken, there are two available options for that gearbox. In the first case the forward and reverse ratio is the same namely 2.737 : 1. The second configuration you have different forward and reverse ratios, 2.737 : 1  and 2.227 : 1. Which ratio is used as forward in this case depends if you are using a right hand or left hand prop.

Although most gearboxes for light duty and pleasure are 2:1 or close enough you cannot assume anything. Each boat/prop/engine setup is unique.
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joe
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« Reply #3 on: September 08, 2009, 21:06:55 CET »

turn the main shaft one full rotation and see when looking at the prop how much it will turn.
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nando_s
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« Reply #4 on: September 09, 2009, 06:50:04 CET »

Here is the spec sheet for your gearbox. Note that Hurth changed all the gearbox model names and this is what your HSW 250 A is equivalent to today.

* DS-ZF_25_MA.pdf (453.25 KB - downloaded 270 times.)
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