[C38] Twin Disc direct replacement for Hurth or ZF tranmissions

Tue Sep 27 10:10:42 EDT 2011

Max,
I just checked with my folks and got confirmation from Technodrive in 
Italy.  This tranny uses ATF.   Anything else voids the warranty.  You 
should also know  it is important to adjust the linkage correctly for 
forward gear.  There have been problems with them wearing out after a 
year or so if they are not fully engaged.

Chuck

On 9/21/2011 1:02 PM, Max Soto wrote:
> Hey Chuck,
> We are on the same page her...
> I just checked the manual from my friends transmission, guess what! 
> It's a Technodrive twin disc unit. This one is the 60 model (Hurth 
> hbw125 replacement) and the cost was $1260. The 40 is $980 at 
> Transmission Marine in Fourt Lauderdale. This is by far the cheapest 
> place that I have found for transmissions and parts.  Www. 
> Marinegears.com <http://Marinegears.com>
> Regards, max
>
> Sent from my iPod
>
> On Sep 19, 2011, at 7:14, Chuck Finn <charles at finn.ws 
> <mailto:charles at finn.ws>> wrote:
>
>> /Max,
>> This looks very much like the Beta Marine transmission I installed 
>> this summer! *TECHNODRIVE Twin Disc TMC 40 P transmission, /NEW: US 
>> $1,098.00 /*
>> */from http://soundmarinediesel.com/transmissions.shtml/*
>> */My original Hurth ZF failed last summer and I had it rebuilt.  
>> Whole job cost about $3000 and took more than a month.  It failed 
>> again this summer with less than 40 hours total on the transmission. 
>>    I don't know whether the second failure  was due to a bad rebuild 
>> or shoddy workmanship by Shelburne Boatyard (of the 8 bolts that hold 
>> the transmission to the engine, 3 were so loose they were removed 
>> without a wrench).  Our webmaster (Anders) removed the Hurth 
>> transmission the second time around and it took him 45 minutes. /*
>> *//*
>> */I did have problems with the original Beta transmission sent (it 
>> would not reliably shift into forward), but the folks at sound marine 
>> diesel were so accommodating that despite having to switch it out I 
>> would still recommend them.  They spent a couple hours on the phone 
>> with me and even sent the replacement without charging me for having 
>> two of their transmissions in my possession  (I wanted the 
>> replacement on hand so I could change it out when I had the time)./*
>> */You should also be aware there is a 1/4 inch difference in the 
>> height of these transmissions.  For those of us keeping the 5424, 
>> this requires we lower the engine a 1/4 inch.  This can be 
>> challenging, given where our motor mounts are and the fact most folks 
>> will find the nuts and threads are in rough shape.  Speaking of motor 
>> mounts!  I highly recommended that you change out your motor mounts 
>> and install a flex coupler when changing the transmission!  You can 
>> pretty much bet your motor mounts need replacing after 10 years and 
>> some engine manufacturers recommend half that time.   Another reason 
>> to change your motor mounts during transmission work is there is a 
>> lot more room back there to work without the transmission in the way 
>> and it takes about 40 pounds off the motor lift.
>> And don't let a boatyard tell you you need to pull the boat to do 
>> this!  I paid for three lifts ($900) because Shelburne Boatyard 
>> insisted this was necessary. They said the prop shaft would have to 
>> be removed to make room.  After disconnecting the drive shaft 
>> coupling, put a hose clamp on the end of the shaft and slide it back 
>> until there is enough room to work on the transmission  (the hose 
>> coupling ensures you don't accidentally let the shaft slide out of 
>> the boat).
>>
>> Yes, Steve, I need to write this up as a tech article!
>>
>> Chuck Finn
>> Mighty Quinn  #114
>> Great Lakes/*/*/*/
>> /*/***//**
>>
>> **//**
>>
>>
>> On 9/18/2011 10:12 PM, Max Soto wrote:
>>>
>>> Hi everybody,
>>>
>>> For those who are planning to replace the Hurth HBW100 or newer ZF 
>>>  M10 from the Universal 5424, M35 and  25XP series, according to 
>>> some marine engine manufacturers and some forums, these new ZF 
>>> trannys are now half as strong and reliable as our old long 
>>> lasting Hurths....
>>> I was told that the place that makes all the internals is not the 
>>> same and this is what made the huge difference.
>>>  When I was quoting, I was told by the engine sales person  to buy 
>>> the bobtail engine and install my old transmission instead of the 
>>> new ZF10 that they use, or go to the new Twin Disc MG340.  The twin 
>>> disc MG340 is the right replacement for our engines, and is what 
>>> Phasor MArine and Betamarine are recommending now after so many 
>>> problems with  customers that were using ZF10....
>>> They share the same foot print, shaft and coupling measures, so, 
>>>  same damper plate and bellhousing adaptor can be used. Engine just 
>>> has to be raised 5mm and shifting cable routed to port of the 
>>> tranny,  and that's it. They are supposed to be stronger and more 
>>> reliable. Plus, they are a few bucks cheaper.  I know it because I 
>>> just bought one for a friend with a Perkins engine...
>>>
>>> http://www.twindisc.com/MarineProducts/MarineTransSeries_mg_340.html
>>>
>>> Again, this is just what I have been told, but after checking some 
>>> forums, it appears to be true..... If planning to go this way, 
>>> please do your own research... But hopefully, this will help some of 
>>> you..
>>>
>>> Regards,
>>>
>>> Max Soto
>>> C38 #198 ESTANCIA
>>> Puntarenas, Costa Rica
>>>
>>>
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