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Hurth Gear Boxes


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Hurth Marine Transmissions:

Hopefully this maybe of help to those with Hurth Gearboxes.

Hurth have two types of boxes. A model number prefix of HBW identifies the smaller box and the larger Hydraulic box has an HSW prefix.

 

The oil in Hurth marine boxes should be changed at the start of each season and/or at 250 hour intervals. If you are doing heavy work, then it is recommended that you change the oil every 100hrs. Change immediately if the oil is discoloured or if you have a prop wrap up in rope. Disclouration can be caused by overheating and by clutch slip due to overloading. The brown tinge to the oil and the burnt smell is fibre particles from the clutch discs.

The fluid to use in the ZF range is ATF (autotransmission fluid) Both the Dexron 11 and 111 is perfectly acceptable. Synthetic ATF’s like Redline and Amzoil etc are even better, as they halp reduce heat. It is not recommended that an additive be used.

Model Capacity in Quarts

HBW 40 (4M) .32

HBW 50 (5M), HBW 100 (10M) (nee 5) .44

HBW 125 (12M), HBW 150 (15M) (nee 10) .63

HBW 150A (15MA) .59

HBW 150V (15MIV) 1.06

HBW 220, HBW 250 (25M) (nee 20) .79

HBW 360 1.50

HBW 360A 1.60

HBW 450 1.90

HBW 630 2.10

 

All Hurth marine transmissions have damper plates. They are installed on the engine's flywheel in front of the gear. They resemble a small, spring loaded clutch.

It is only visible when you remove the transmission. All the damper plate springs should be in place, tight and not loose or rattling. It is good advice to change the plate whenever you have the transmission off the engine as it is then when it is easiest to get at. A failing or failed plate can cause rattles and thumbs and clunks and sometimes these can be felt through the boat while underway.

 

If you have issues with shifting into gear, first check and adjust your linkage. Linkage problems are very common on Hurth boxes. If the problem still exists, see if there is a difference in the difficulty in engaging forward versus reverse. If it is significantly more difficult to engage the box in forward as opposed to reverse, this indicates that the thrust washers are worn. The box will require service or replacement.

Small mechanical Hurth gear boxes do not have filters. One could be fitted as an after-market add on and would probably aid the longevity of the box. But a small amount of engineering is required and best done by a professional.

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Florence

PostPosted: Fri Dec 19, 2008 4:04 pm

 

After suffering a seized gearbox, we managed to source a used unit locally thanks to the help of the good people in the Forum.

Does anyone know a source of new replacement units? I believe that Hurth are no longer in business but have been told that a firm called ZD or similar may be able to help.

The jury is still out on the cause of the failure, with lack of oil being the Chief Suspect. We have had our yacht Florence for over 12 years and the gearbox oil level never changed I had become a bit blase about checking. Lesson learned is to check once a month as per the manual. It is fiddly but well worth the effort against the hassles we have had getting up and running again.

 

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Wheels

PostPosted: Fri Dec 19, 2008 4:38 pm

 

Try this place.

http://www.marinebits.co.nz/gboxfr.htm

 

Lack of oil would do it. But the oil would have to go somewhere first and you said you didn't see anything leaking before hand. Soooo I am not so sure.

 

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Steve Pope

 

PostPosted: Fri Dec 19, 2008 6:22 pm

 

Diesel Services at 120 Penrose Rd Mt Wellington ph, 5250830 are the Auckland agents for ZF (Hurth) marine gearboxes, I have recently had a ZF 10 box fail after only 350 hours of use, the problem being that it was according to ZF in Italy to be out of Warranty as it had been installed just over 2 years ago although the damage would have been apparent much earlier had the box been removed for inspection sooner. Diesel Maintenance persuaded ZF to supply parts to repair the box free of charge, we had to pay for the labour. Good people to deal with. My thoughts about ZF boxes, i'm not so sure on as I have heard of several other failures occuring well before you would expect to have trouble. PRM equivalent box to the ZF10 are priced around $2000.00 including the drive plate.

 

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Slacko

PostPosted: Fri Dec 19, 2008 10:10 pm

 

Have you checked the gearbox oil cooler for leakage?

The oil may have slowly gone over the side with the cooling water.

 

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Florence

PostPosted: Sat Dec 20, 2008 10:07 am

Many thanks for the replies folks. Yes, where the oil may have gone is a mystery. We have a drip tray running under the engine and gearbox. We get a trace of engine oil in here from the Perkins but have not seen gearbox oil which is red. There is no oil cooler. I will see how the replacement box goes over the holidays

 

 

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