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Old 28-01-2021, 06:20   #1
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ZF gearbox question

I had my boat repowered by a well respected boat yard in September. Now four months later Iíve been sitting at a dock unable to move. My new ZF25M will no longer go into forward. Has anyone else had similar problems with their ZF gearbox? To make matters worse, although ZF says they will replace the gearbox they say theyíll only pay for four hours of mechanicís time (not nearly enough) and wonít pay for my dockage fees.
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Old 28-01-2021, 07:10   #2
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Re: ZF gearbox question

Without knowing your specific installation, the gear box weighs 19KG mate, 4 hours for a good mechanic is plenty of time.

Organize a time with mechanic, get them on and change it out and problem solved. 4 hours you have prob even got time for a seatrial...
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Old 28-01-2021, 07:19   #3
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Re: ZF gearbox question

Will it go in reverse?? Is it possible this is a simple shift cable or linkage issue??
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Old 28-01-2021, 07:38   #4
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Re: ZF gearbox question

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Will it go in reverse?? Is it possible this is a simple shift cable or linkage issue??
If only the world were so simple. I checked that and so did the mechanic. According the the deler the gearbox needs to be replaced.
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Old 28-01-2021, 07:41   #5
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Re: ZF gearbox question

This is not my time estimate, it’s the dealer’s estimate. I have a sailboat and there is not enough room between the gearbox and where the shaft enters the boat. The engine needs to be moved about six inches forward to remove the gearbox, which involves unbolting the engine and disconnecting a lot of hoses.
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Old 28-01-2021, 08:27   #6
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Re: ZF gearbox question

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This is not my time estimate, itís the dealerís estimate. I have a sailboat and there is not enough room between the gearbox and where the shaft enters the boat. The engine needs to be moved about six inches forward to remove the gearbox, which involves unbolting the engine and disconnecting a lot of hoses.
Fair enough, whats the mechanic say about the time frame? TBH someone that has never moved a engine before it can be daunting, but you would be surprised how quick it can happen. just my 2 cents (as a diesel fitter )
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Old 28-01-2021, 08:33   #7
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Re: ZF gearbox question

Is it running on oil or trans-fluid? Is whatever is in there correct?
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Old 28-01-2021, 09:31   #8
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Re: ZF gearbox question

In answer to your question, This would be very unusual. This gearbox has been made for many years and is highly reliable. Well cared for they usually outlast the engine.

How many hours on it before it failed? Was it ever in forward while you were sailing?
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Old 28-01-2021, 10:51   #9
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Re: ZF gearbox question

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If only the world were so simple.
If only people included the entire scope of the problem and the things they've already tried in their attempts to narrow down the issue.
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