Identifying a Hurth (I think) Gearbox

[patprice]

Warby 12 Hi again. I have two ZF 10,s in the shed. One good and one with bad clutches.
I assume your box/engine are unsuitable for a ZF10. If not send me an email.
Pat

[Jim Cate]

FWIW:

ZF gurus that I consulted with when we had issues said to use NON-Synthetic Dextron III fluid and change it every time you change the engine oil (in our case 200 hour ntervals). We have around 3500 hours on the new ZF10 we installed, and so far so good.

Adding the cooler will certainly help, but it willl not increase the oil capacity. It is an external heat exchanger that bolts on to the flat machined surface on the port side of the ZF10. There is no flow of lube into the cooler.

Jim

[River Cruiser]

Originally Posted by Jim Cate

FWIW:

ZF gurus that I consulted with when we had issues said to use NON-Synthetic Dextron III fluid and change it every time you change the engine oil (in our case 200 hour ntervals). We have around 3500 hours on the new ZF10 we installed, and so far so good.

Adding the cooler will certainly help, but it willl not increase the oil capacity. It is an external heat exchanger that bolts on to the flat machined surface on the port side of the ZF10. There is no flow of lube into the cooler.

Jim

The Hurth HBW series is a mechanical transmission and benefits from synthetic ATF. The HBS series which I believe is a hydraulic transmission may not, I don't know. The owner really needs a knowledgable mechanic to identify what series he has. The only reason I know of not to use synthetic with wet clutches is the possibility of the clutches slipping because of how slick synthetic is, the additives in synthetic ATF should keep that from being a problem. Some brands use engine oil normally sae 30 and using synthetic engine oil could be a problem causing the clutches not to lock up as they should.


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[captain mitch]

First DO NOT PUT SYNTHETIC OIL INTO AN OLDER HURTH !!!! for sure it will make it slip and burn up the clutches. Being a mechanical box, the pressures are quite finite so the synthetic will be just toooo slippery for the plate pressure.
You do not want to change the oil but perhaps once a season, can't explain why here, but you want the oil to age a bit for better clutch life, and the big bearings will not be bothered.
I am attempting to attach my exploded views and dimensoins for HBW 30 and 15

[captain mitch]

hurth spec sheet for hbw30 and 15

[Warby12]

Looking forward to them Captain as ZF and everyone else I contact either doesn't reply or can't help

[River Cruiser]

Here is a link to information on hurth hbw gears.
http://www.foleyengines.com/resource...-basic-service


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[Warby12]

Hi Mr River Cruiser, yes I've read that one, very helpful. My main problem is locating parts for my specifc drive. Otherwise I'll have to baby it until we can maybe replace with a PRM or similar

[captain mitch]

HBW 30 and 15 specs
try-- transmission marine inc, 223 sw 33rd court, ft. lauderdale, fl 33335
www.marine gears.com

[Warby12]

Hi there, despite everyone's help (thanks Captain Mitch) I've drawn a complete blank. It looks like a Hurth but it isn't. ZF have suggested it is a Chinese copy.
Thanks all I will source a replacement when it blows if not before