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Simrad AP pump brushes

Discussion in 'Technical Discussion' started by Pascal, Sep 20, 2019.

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  1. Pascal

    Pascal Senior Member

    Joined:
    Feb 29, 2008
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    Location:
    Miami, FL
    second time in three years I had an AP pump failure “Rudder movement failure”

    Took me a while to figure it out the first time around... turned out to be dirty motor brushes.

    Is that common with these pumps?
  2. MBevins

    MBevins Senior Member

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    Windsor On. Canada
    Mine hasn't been serviced in the 20 years I've owned it and I highly doubt the previous owner touched it.
    I use it every time I use the boat. Is this on your personal boat?
  3. Pascal

    Pascal Senior Member

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    No, on the Lazzara 84 I run. 10 years old... mains have 3000 hours half of that in the last 3 years, most wiTh AP on
  4. MBevins

    MBevins Senior Member

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    Do you have the resources to check the operating pressure?
    I'm wondering if the load is high this causing excess current draw through the brushes.
  5. Pascal

    Pascal Senior Member

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    No i don’t but the helm feels right...
  6. wdrzal

    wdrzal Senior Member

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    Check to see if there is wear on the commutator, usually it becomes concave. On some, depending on wear you can remove the armature and take a few thousands off the commutator on a lathe. Fitting new brushes, I always get a sanding drum that matches the radius and sand in the curve. Putting flat brushes in causes a lot of electrical arching that can damage the commutator, insulation on the windings or the brush itself.
  7. MBevins

    MBevins Senior Member

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    Yes, what he said.

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