Problems with Bosch motor drive

Discussion in 'Bikes and eBikes' started by grumfy, May 21, 2016.

  1. grumfy

    grumfy Funster

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    I have had my Kalkhoff Agattu i8 for getting on for 3 years and really like it but..... I was out recently in the rain and getting a move on but when I stopped pedalling the pedals were reluctant to stop and freewheel though if I stood on them hard they would. If I turn the motor off all back to normal but not with motor on.
    I want someone reasonably close to Basingstoke who knows the Bosch system. I cannot see myself travelling to 50cycles the obvious people in Loughborough who supplied the bike.
    Can anyone suggest a repairer? Note the people in Farnham who look really good will only look at their own customers bikes.

    Thanks
    Eric
     
  2. jockaneezer

    jockaneezer Funster

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    The ratchet pawls on the crank have stuck in the up position. Complete strip down, clean and lube required. I did both our bikes last year and posted a thread and pics on it. Will try and find the thread. It's not too difficult a job if you have a modicum of mechanical ability (y)
     
  3. grumfy

    grumfy Funster

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    Thank you, I am prepared to have a go. Does it require any special tools.

    Eric
     
  4. jockaneezer

    jockaneezer Funster

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    Can't find my post but here's a pic of one the pawls that caused my problem. The grease dries out and the free wheel pawls overcome the return spring and stick in the up position which won't allow the pedals to disengage.
    I followed some info I found on the net that suggested forcing the pedals round, totally the wrong thing to do as I found out as it shattered one of the pawls, usually an exchange motor is the only answer to this situation, but luckily 50 cycles sent me two second hand replacements that sorted me out.
    20150610_120419.jpg
    You can see the dried out grease/rust that causes the problem. When I stripped Val's bike, it was heading the same way. It's an awkward job, but should be done routinely a bit like a vehicle service.
     
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  5. jockaneezer

    jockaneezer Funster

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    You'll need a jacking tool to remove the pedals, other than that, it's just torx screws. Here's a pic of the split crank case.
    pm me if you need any more info.
    20150610_120302.jpg
     
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  6. travelling wilbury

    travelling wilbury Funster

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    failing that good advice....50 cycles also have a shop in Shoreham which might be a possibility?
     
  7. grumfy

    grumfy Funster

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    Once again, thanks. From your photos and description it seems to be my problem. Hopefully I did not do too much harm when riding home.

    Eric
     
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