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Old 28 May 2018, 19:22   #51
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Country: UK - Scotland
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Boat name: charlie girl
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The idea would be to adjust up till the wheel locks going forward and see if it unlocks as it should rotating backwards that will determine if the problem lies in the drum or linkages
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Old 29 May 2018, 04:51   #52
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Understand .... just unsure if I will be able to apply enough rotational force to move wheel ....
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Old 29 May 2018, 05:28   #53
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Wheel should rotate easily in reverse even if locked in forward if not the problem lies in the drum
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Old 29 May 2018, 07:20   #54
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I've been following this thread from the start as it's an issue I've had with many a boat trailer in the past. Great info

Here's another thread that may be of some use: http://www.4x4community.co.za/forum/...avan-reversing

I've taken to carrying a block as I've gotten fed up of wheels locking when trying to reverse.
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Old 01 June 2018, 17:01   #55
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Spent another 4-5 Hrs ... put trailer up on stands.
Operated handbrake, could not turn wheels in reverse.
Increased gap in actuator rod at compensator until brakes could be turned by hand in reverse.
At this point rod has about 30mm of play ... whereas it should have none, but tried it to test.
Hooked up car ... same fault.


Spoke to a couple of trailer specialists ... interesting that they said put a clip in place to prevent brake operation when reversing .... ...like they used to be back in 70’s. (Similar to link in post above)
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Old 02 June 2018, 13:10   #56
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I think you have something assembled wrong somewhere in the drums
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Old 02 June 2018, 16:10   #57
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Stripped drums down again ... and with 2 guys watching assembled as per AlKo and Indespension manuals.
So had 3 pairs of eyes confirming things are correct .... you don’t dismantle the autoreverse cam assembly, so those are 100% correct.
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Old 02 June 2018, 17:26   #58
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I am sure you know what you are doing given all the time and effort you have spent and the fact that the issue is across all 4 hubs. Can you post a photo of the set up hubs to see if there is anything obvious. Seems very odd issue with otherwise good brakes.
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Old 02 June 2018, 18:12   #59
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I don't know if it across all 4 hubs ..... for sure when reversing up a slop at time brakes lock on ... all weight is on rear axle, you can for sure hear the rear axle brakes coming on.
Here is pic of assembled back plate... I did after the pic was taken, lubricated the expander clutch (swivel pin) and cam swivel pin.


I have uploaded pic of what the assembly should look like -AlKo Backplate ... and also pic of the actual backplate.
Obviously offside near side are mirror images ........... I made certain thet for each backplate the swivel pin of the expander clutch was on the same side as the autoreverse cam.
Attached Thumbnails
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Name:	Near side brakes.jpg
Views:	93
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ID:	125081   Click image for larger version

Name:	reassembled backplate offside.jpg
Views:	100
Size:	186.4 KB
ID:	125082  
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Old 02 June 2018, 18:39   #60
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That's definitely a mystery 🤨
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