Help / advice with Hurth HBW 100 Gearbox probems

[Jcorstorphine]

I have a Hurth HBW 100 gearbox which has started to slip. Although the gearbox is about 18 years old it has only been in service since 2009 ( long story, project boat) and may have only done about 50 to 70 hours per year.

I have heard that these boxes are almost throw away as the cost of a repair is not much less than a new box.

However, I have rebuilt car gearboxes in the past and was wondering if anyone had rebuilt a Hurth Gearbox. I have found a manual on the web but
it is not that clear but might be better when I print it.

Can anyone steer me in the right direction or suggest a company who can do a rebuild if I chicken out.

There is a complication in that my box is a 1.5 : 1 reduction ratio which I chose to give me a higher prop speed as have limitations on prop diameter.

It has not had an arduous life as I run the engine at 1500 rpm giving 1000 prop RPM which gives me about 6 knts.

If I buy a new box with the standard 2:1 ratio, I would have to run the engine at 2000 rpm (more noise) or buy a massive over pitch prop as I cant increase the diameter.

Any advice help would be appreciated.

 

[superheat6k]

I assume you have checked the gearbox oil level and oil strainer ?

Sounds like a slipping clutch.

I have the manual for the HBW630.

These guys might be able to help - Isle of Sheppey, Kent I think ...

http://www.mitgroup.co.uk

Another trick would be to run it astern (simple linkage change onto the selector) and install an opposite hand prop, but this would give you two props hooking the same way if a twin shaft. To extend this principle you could swap two boxes over and reverse both.

 

[Caer Urfa]

I have a Hurth HBW 100 gearbox which has started to slip. Although the gearbox is about 18 years old it has only been in service since 2009 ( long story, project boat) and may have only done about 50 to 70 hours per year.

I have heard that these boxes are almost throw away as the cost of a repair is not much less than a new box.

However, I have rebuilt car gearboxes in the past and was wondering if anyone had rebuilt a Hurth Gearbox. I have found a manual on the web but
it is not that clear but might be better when I print it.

Can anyone steer me in the right direction or suggest a company who can do a rebuild if I chicken out.

There is a complication in that my box is a 1.5 : 1 reduction ratio which I chose to give me a higher prop speed as have limitations on prop diameter.

It has not had an arduous life as I run the engine at 1500 rpm giving 1000 prop RPM which gives me about 6 knts.

If I buy a new box with the standard 2:1 ratio, I would have to run the engine at 2000 rpm (more noise) or buy a massive over pitch prop as I cant increase the diameter.

Any advice help would be appreciated.

Hi
You will find a number of companies doing reconditioned Hurth 100 gearboxes but you will find they are only about £100 cheaper than a new one of which
there are very few about as Hurth was taken over by ZF some years ago.

You can buy an exact replacement which is the ZF10M which simply fits the same albeit the ratio is very slightly different at 2.05:1 ahead and 1.86:1 astern, hence my cruising speed is approx 1800 rpm with a 15" RH 3 blade prop giving 5 knots

http://www.bukh-bremen.de/files/346...anual_ZFMLine_Mechanisch_code310.01.0006f.pdf

I have found that the advice of changing the gearbox oil every 12 months or 100 hrs is good practice which is what I do.

I also changed the thruster plate at the same time and got it direct from http://www.randdmarine.com/mdamper.asp


Mike

 

[volvopaul]

Call mark at lancing marine for an excellent price

 

[Jcorstorphine]

Thanks for advice.

However the good news is that it looks like a false alarm as I found a large piece of builders polythene round my prop with the blades partially encased so giving little or no drive.

With the prop clear, I have run the engine at 1500 rpm and checked both actual engine revs and propshaft revs with a portable tacho and found prop revs at 1000 which with a 1.5:1 reduction is spot on. Ran it for about 30 mins and checked again and all was well,

However it has reminded me to change the gearbox oil but that is another question as all is not clear with regard to buying the correct grade, type and formulation of the oil. It used to be ATF type A but that is not on the shelves any more so have created a new thread as doubt this one has any life left in it. (bit like me)

 

[KompetentKrew]

Hurth 100 gearboxes …

I have found that the advice of changing the gearbox oil every 12 months or 100 hrs is good practice which is what I do.

I also changed the thruster plate at the same time and got it direct from http://www.randdmarine.com/mdamper.asp

Sorry to bump such an old thread, but hopefully Mike has subscriptions turned on - how does one replace the thruster plate, please? Is it a hard job? The page you link to is damper plates, so I guess this is another word for the same thing?