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Old 27-01-2014, 11:27   #16
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Re: Hurth HBW 50 R2 gearbox removal

Boat is 34 foot, built 1962, all wood, 8 tons displacement - pic attached.

Engine is a Perkins Perama installed 1993. Almost certain that the gearbox was installed at the same time. No problems before now in current ownership of 8 years.
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Old 27-01-2014, 11:28   #17
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Re: Hurth HBW 50 R2 gearbox removal

Sorry - pic now attached as per previous post.
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Old 27-01-2014, 11:32   #18
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Re: Hurth HBW 50 R2 gearbox removal

Wow! nice boat Graham.Its as old as me.The other problem with Hurth transmissions is when they sit unused.The bearings sit above the fluid and rust.When storing boat its recommended to fill transm. to top,to avoid this problem.I would just get the ZF10,its about the same price,and alot easier to find.They call them the $1. an hr. transmission.
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Old 27-01-2014, 11:33   #19
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Re: Hurth HBW 50 R2 gearbox removal

Quote:
Originally Posted by highseas View Post
Clutches for starters,then the thrust washers.I rebuilt my HBW50 at authorized Hurth rebuilder 5 years ago in San Francisco.Finding parts then was almost impossible,finally did though.Lasted 900hrs.The 50 is discontinued,the ZF6 was the replacement until about 1 year ago,now it is discontinued also,and now the ZF10 is the standard replacement model.Did everything right .Always in reverse under sail,changed ATF every 100 hrs,fully in gear in use,babied the thing,as it was my second.Now about to install ZF6.Going synthetic this time.
I was checking transmission temperature often and found the trans was getting too hot in my engine space, not enough ventilation, heat is the reason for early failure. they offer a water cooler which bolts on the trans in a prepared spot for it. after installing the cooler, the temperature stays within the specs for this trans. when changing oil, it should be the same red it was when filled. brown means overheat. without the cooler, reduce speed until the trans cools down. check temperature with a cheap laser unit from harbor freight. $25 or so
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Old 27-01-2014, 11:42   #20
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Re: Hurth HBW 50 R2 gearbox removal

Good advice sailr,I have the laser thermometer now.I religiously change fluid,with this latest unit I will use synthetic.The cooler sounds like a good idea.But the duty cycle must not be overlooked.
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Old 27-01-2014, 12:26   #21
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Re: Hurth HBW 50 R2 gearbox removal

Sailr,I was curious how many hrs. you have on that 21 yr. old transm. ?
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