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Thread: 90 Amp Generator on 109 FFR Land Rover

  1. #31

    Default Re: 90 Amp Generator on 109 FFR Land Rover

    Just check the U & V pin at generator level as mentionned in previous threads.
    I had made this check weeks a go and already had no reading, so checked the carbon brusches and discovered that one of the maintaining spring was broken.
    All this was changed and I must admit that I didn't recheck after changing the brisches and the spring.
    I took for granted that this problem was resolved.
    I was more concentrating on the voltage delivered between the chokes.....

    Anyway, checking agin this morning I have no reading between U & V Pins !!!!

    Do you recommend I check again the brushes ?? And dismantle the cover again ?
    Could it be another problem ?

    This is a surprise to me.

    Jimmy

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  3. #32
    Join Date
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    Default Re: 90 Amp Generator on 109 FFR Land Rover

    Jimmy if you have no reading at U-V directly on the generator then you have no option but to dismantle the brush assembly. Rotate the shaft & check again if there is a reading but with a broken spring it is unlikely.
    Clive Elliott

    Always wanted old British Army publications of any period (the older the better) eg AC, ACI, AEMI, AESP, AO, COSA, CP, CR, DCI, EMEC, EMEI, EMER, EMPL, EMPS, ER, ETS, JSP, LoC, LTI, MAOS, MRA, RAOS, REA, VAOS, WMTI, etc, Army & WO Coded publications in paper or fiche.

  4. #33

    Default Re: 90 Amp Generator on 109 FFR Land Rover

    Clive,

    The spring was changed at the same time I changed the brushes.
    But I may have done something wrong.

    Stupid question may be but I can chack the resistance between U & V before re-assambling everything ?
    Will do that tonight or tomorrow morning.

    Jimmy

  5. #34
    Join Date
    Oct 2005
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    Default Re: 90 Amp Generator on 109 FFR Land Rover

    Yes I would check the resistance of the field winding before you reassemble the brushes, to do this put the ends of your resistance tester across the slip rings (Item 24 on pages 20/21) & should be about 15 ohms I think.

    These are the two rings next to each other that each brush rubs against. When you have reassembled the brushes & springs make sure the brushes do exert pressure on the rings & are free to move against the spring tension.

    Also make sure the brushes are aligned correctly & that a brush can only contact its own slip ring without touching the other ring. Make sure that the edges of the slip rings are clean & free of conducting dust from the wear of the old brushes.

    Then check that the U-V resistance is correct on all rotations of the shaft, then replace the end cover.
    Clive Elliott

    Always wanted old British Army publications of any period (the older the better) eg AC, ACI, AEMI, AESP, AO, COSA, CP, CR, DCI, EMEC, EMEI, EMER, EMPL, EMPS, ER, ETS, JSP, LoC, LTI, MAOS, MRA, RAOS, REA, VAOS, WMTI, etc, Army & WO Coded publications in paper or fiche.

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