Hurth HBW-5 Transmission - Page 2 - SailNet Community
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post #11 of 17 Old 06-19-2010
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Originally Posted by KVK View Post
Any successful experiences removing the barrel bolt inside the Martec hub?? The barrel bolt uses a 1/2" socket, and its integrity is less than desirable. The prop has been rebuilt at least twice, and is ready for the recycling bin if i can't pursuade the barrel bolt out.
This is an old post now but can someone tell me what is a barrel bolt ,Is the Martec hub the blue thinggy?
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post #12 of 17 Old 06-27-2010 Thread Starter
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Tytower - the blue thinggy was the prop connector, connecting the prop shaft to the transmission end. The barrel bolt is found inside the Martec folding prop hub and is threaded unto the end of the prop shaft to keep the prop in-place.
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post #13 of 17 Old 01-23-2016
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Re: Hurth HBW-5 Transmission

I know this is quite an old thread now, but hoping someone might be able to help point me in the right direction. I need to replace my original Hurth HBW 5 transmission attached to a Universal M25, but I'm confused as to what model in the ZF line this is equivalent to today. I *think* that the HBW 5 eventually became the HBW 50, but not positive on that either. I'm trying to replace it with essentially the same unit to keep all of the ratios the same. Been doing a fair share of googling, but haven't found a definitive answer. Can anyone help direct me to the correct model? Thanks so much in advance!
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post #14 of 17 Old 01-23-2016
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Re: Hurth HBW-5 Transmission

This tidbit from a defunct link:

Quote:
ZF 6 M Replaces the ZF 5M (HBW 50)
2.045 1.864 2.722 2.150
Not sure if this means there are several gear ratios available of it those ratios apply to the two models listed.. presumably each pair is fwd/reverse

Ron

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post #15 of 17 Old 01-23-2016
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Re: Hurth HBW-5 Transmission

Thanks Ron. I saw that somewhere as well. But do you happen to know if the HBW 5 was replaced by the HBW 50? That's another uncertainty I have in trying to trace from the HBW 5 to the current ZF model.

Thanks!
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post #16 of 17 Old 01-23-2016
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Re: Hurth HBW-5 Transmission

My advice would be to replace with the exact same model that has been rebuilt by a reputable shop.

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post #17 of 17 Old 01-28-2016
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Re: Hurth HBW-5 Transmission

My advice would be to call and ask. Most replacements for the HBW5 were with the ZF10 which is 1 1/2" longer so the prop shaft length needs to be reduced.

Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#)
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