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Old 11-05-2009, 21:06   #1
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Hurth HBW-100, Oil Leak & Parts Diagram

After a cruise up the coast we noticed some red trans fluid under the engine . Eventually we sourced it up to where the gear selector lever comes out of the gearbox.

I do not have a parts diagram (or service manual) for this transmission. Can someone comfirm that the seal can be accessed by removing the plate holding the selector lever in the box ? Any hidden surprises looming in there ?

Anyone got a parts diagram &/or service manual for the box in some electronic format, even if just the relevant section ?

Thanks
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Old 12-05-2009, 01:30   #2
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I have rebuilt this transmission for a pearson 35 and as I recall Once the transmission is out the cover is removed with six bolts Have the cover faceing up with the lever in the center,nutral,position You will need to take the seal and cover to a bearing supply house and have it measured for a replacement.While there get some gasket material since the cover will need a new gasket. You might be able to remove the cover with the transmission still in the boat the only thing that MIGHT fall out would be the shifter paw.
good luck
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Old 12-05-2009, 01:52   #3
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Hurth - ZF Support Documents:

ZF.com Marine Downloads

http://zf-marine.com/ZFR/Support/ind...SC=1024:768:32

See also:

Study hall for Gearboxes

Hurth HBW 5, 10, 20, 50, 100, 125, 150, 250 Internal parts
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Old 12-05-2009, 03:13   #4
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Hopefully I can do the swap with the transmission in the boat as the alternative is rather complicated.

Thanks for the links, the parts diagram on the marinetransmissions site is great, it gives me a idea of what is in that little box of tricks.
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Old 18-05-2009, 10:23   #5
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I had a problem with my Hurth just like that. Turns out that I had overfilled the transmission fluid and it forced it out the gasket on the lever. A common problem and result according to a mechanic friend. Pulled the transmission and replaced the gasket (part easily obtained and relatively cheap). Transmission was fine. Learned a lesson.
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Old 18-05-2009, 14:13   #6
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The part is suppose to be in the mail. I will have a go at replacing it with the transmission in the vessel, if not then it will have to wait until our spring.

The Transmission is tilted to 15 degrees and perhaps that is a factor in the oil leak.
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Old 12-10-2010, 15:47   #7
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After someone PM'ed me re what was the eventual answer to the question. I though I should say what happened here for others to benefit by.

Replacing the seal is dead easy:
Remove the shift lever off the shaft.
Remove the 4 nuts retaining the shift cable mounting plate and the plate over the shaft seal. Carefully pry or tap the plate to break the seal.
Replace he shaft seal.
Reinstall all the bits in reverse order and make sure you seal the plate as it is reinstalled.
Voila. Took about 40 mins from start to end. It was done in the boat with the motor in place. You could do it mid cruise if you had to & I now carry spares just in case.
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