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Topic-icon Suspension checks

  • Brianlec
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1 year 3 months ago #1447 by Brianlec
Brianlec created the topic: Suspension checks
I'm a reasonably competent mechanic, but new to this subject.

How should I go about checking the suspension on a Dandy? What sort of angle would the arm be at normally when the weight of the trailer is on it?
Would I be able to feel any movement in the suspension?

I have checked the wheel bearings, and they are smooth without play.

Don't want to just change things for the sake of it, but if there is some problem then of course I will.

Brian.

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1 year 3 months ago #1448 by pumps100
pumps100 replied the topic: Suspension checks
Hi Brian,

I can only give you my input based on our 1997 Dandy Delta which we have owned for 8 years. I have recently changed the suspension.

If you search the internet on torsion trailer suspension you will see references to a typical life expectancy of around 20 years. My understanding is that time rather than usage is the dominant factor of the decay of the rubber.

I don't know what the angle of the arm should be. But if I was you this is what I would do:

1. Check the production date stamp on the 'A' frame. The last two digits are the year of manufacture.

2. Using a spirit level level the trailer. Measure from floor to the hitch ball cup. If we assume a Dandy 5 is like a Discovery/Designer at new it should be 34cm. If you measure less then the difference will be the sag/decay over time. You might have to do some further arithmetic as I appreciate your set up has been fiddled with over the years.

3. Closely examine the condition of the tyres: (i) look for uneven tyre wear particularly to the inside outer side and (ii) try to establish if the tyres/wheels are splayed.

Thats about all I can say other than if in any doubt change it. I was negligent not changing mine earlier and almost came a cropper on the A6 when the wheel bearing failed ( wheel was very splayed) and the wheel with hub detached.

Regards

Ian
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1 year 3 months ago #1449 by Brianlec
Brianlec replied the topic: Suspension checks
Thanks for the explanation, I hadn't realised the wheels could splay that much.

The only date I have found so far is on the hitch itself, 1986. Can't see anything on the A frame as it is covered in some awful paint.

I do remember that I had a slow puncture in the LH tyre and when I took it off there was some feathering on one side of the tread. I did check the other tyre and could see nothing like it on that one.

The trailer is currently in NW France, so the dilemma is, do I go over and bring it back slowly, and do the job here, or do I try to do it over there.

Interesting, the Knott-Avonride Trailer maintenance hand book doesn't mention the suspension, other than checking the ride height both sides.
www.knottuk.com/fileadmin/Knott-UK/usr/p..._Repair_Handbook.pdf

Brian.

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1 year 3 months ago - 1 year 3 months ago #1450 by Brianlec
Brianlec replied the topic: Suspension checks
Just found this.
www.dandytrailertent.co.uk/maintenance/d...-trailer-suspension/

Actually 34cm is quite low compared to my tow ball which is nearer 44cm up. This might account for the modification, raising the hitch by about 10cm.

Brian.
Last Edit: 1 year 3 months ago by Brianlec.

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1 year 3 months ago #1456 by Brianlec
Brianlec replied the topic: Suspension checks
Well searching the web, it seems the generally accepted angles are :-
Down 25 degrees off load, ie. hanging free.
Parallel to the chassis when fully loaded.
Up about 15 degrees on maximum compression.

But both sides should be the same more or less.

Brian.

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1 year 2 months ago #1502 by Brianlec
Brianlec replied the topic: Suspension checks
I have a small trailer which has rubber suspension, it's at least 20 years old, rated at 450kg loaded, and the suspension hasn't dropped at all.

So I was wondering why the rubber suspension on the Dandy seems to have such a short life.

The big difference is my trailer is left unloaded most of the time, the Dandy is fully loaded all of the time. Rubber may be elastic, but does have some plastic properties if under constant load, hence the sag over time.

Way round it would be to chock up the trailer when not in use to get the wheels off the ground, then the rubber would remain in it's original state.

Brian.

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