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  1. #1

    Default Neutral Safety Switch on ZF Hurth

    I have Crusader 8.1 motors and Hurth Transmissions. The Starboard motor is giving me problems starting. The neutral switch is not reading right. I have to play with the shifter to get the engine to start even though I know the engine is in neutral. Where is the Neutral sensor that the engine is reading? I do not see anything on the outside of the tranny.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
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    8,259

    Default Re: Neutral Safety Switch on ZF Hurth

    I don't think the 'engine reads any sensor'...

    The neutral safety switch is on the top of the control block....the starter control, from the key, usually interrupt that or the return, at the slave sloenoid or the starter relay...depending on the vintage. The starter circuit typically uses YELLOW w/ RED trace wiring....

  3. #3

    Default Re: Neutral Safety Switch on ZF Hurth

    Thanks Mark. I am going to check that out this afternoon.

  4. #4
    Join Date
    Sep 2008
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    8,259

    Default Re: Neutral Safety Switch on ZF Hurth

    from the pic, it looks like it at the top, on the RH side, looking at the coupler, from the shaft end....

  5. #5

    Default Re: Neutral Safety Switch on ZF Hurth

    Quote Originally Posted by makomark View Post
    from the pic, it looks like it at the top, on the RH side, looking at the coupler, from the shaft end....

    I found it. I pulled it out and tested it. When I first tested, it did not seem to be working. But after working it a few times it tested fine. I reinstalled it and cleaned all of the connections. First start up it worked fine. Then I shut it down, moved the shifter a few times and could not get the engine to refire. I am going to order a new switch just for ha ha's. Is it possible the shift cable needs some fine adjustment? I replaced the shift cable this year and it is in the exact same place as the old one.

  6. #6
    Join Date
    Sep 2008
    Location
    Maryland - USA
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    8,259

    Default Re: Neutral Safety Switch on ZF Hurth

    If you checked it with a digital meter, it may not tell the whole story.....they use a very low current.

    The cable may need some fine tuning....not sure how Hurth did it but most setups have a decent tolerance band such that the switch will work as long as the gear really is in neutral...

  7. #7

    Default Re: Neutral Safety Switch on ZF Hurth

    Thanks Mark. Replaced the safety switch and everything seems to be working fine.

  8. #8
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,259

    Default Re: Neutral Safety Switch on ZF Hurth

    Glas that one is resolved.....I'm sure you know the other side is likely to follow suite in the future....

  9. #9

    Default Re: Neutral Safety Switch on ZF Hurth

    You are most likely correct. At least I know where it is now and how easy it is to replace. - Thanks

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