- Nov 11, 2009
That’s a really interesting picture showing the difference
Thats, why I asked if there were any roundabouts and severe up and down changes.I dont speculate, I go on facts and the fact is that I have had to change several Al-Ko hitches due to the wrong towball being used.
It may not happen immediately but with each journey the hitch hits the ball supportand causes damage eventually leading to the kind of failure as posted about, and it is only when examined in detail that it can be seen that the issue has been getting worse with each time the hitch has been used with the standard towball.
Thats, why I asked if there were any roundabouts and severe up and down changes.
I don't quite see why towball height should be a possible cause of detachment, unless it was obviously and excessively outside tolerances.
Hi he drives HGVs but tows a variety of different size trailers not relating to HGVs behind the same pick up and has never had an issue, he’s got over 30 years experience towing.Like Raywood, I'm not convinced the problem is only down to the wrong towball.
It is certainly true that the Alko caravan hitch should be used with an Alko style ball, but the reason for the "Special " ball is to allow the hitch the required full range of articulation. The Alko hitch uses the standard EU 50mm diameter ball, the main difference is the diameter and length of the stem that supports the ball. There should be no problem if a hitch is not taken to the limits of articulation and under normal driving conditions that could well be the case, but of course that might beyond the ability of a driver to avoid.
It is of course a concern that DW1311 has experienced a dislocation, and something of a mystery that it waited until it was on a fast road, which is unlikely to have twists and bends that might have over articulated the hitch and loosened it.
Its far more likely either the hitch was not properly engaged before the journey started or at some point during the journey the hitch was over articulated which has loosened it.
Because large articulations would be done at low speed, the hitch may have remained in contact with the ball, but as speed increased on faster roads the wind pressure on the front of the caravan may have been enough to reduce the hitches downward pressure enough to allow it to dislocate.
I note the OP's partner has HGV experience, and whilst I would expect such a person would be perhaps more aware of the need for care when hitching, but ball hitches are rarely used in commercial HGV trailers, so it might have been a new experience, and thus may not have fully understood the process.
I also note the incident involved a pick up truck. This raises the possibility the tow ball height may not have been within the 350 to 420mm height range, and the vibrations through the vehicles chassis may have had some adverse affect on the security of the hitch.
This is of course all speculation.
Hi he drives HGVs but tows a variety of different size trailers not relating to HGVs behind the same pick up and has never had an issue, he’s got over 30 years experience towing.
This is a Dixon-Bate pin and towball hitch.It’s a Dixon Bate 50mm DB2020 towball
Sorry I was informing one of the other members that my partner usually tows other trailers as they thought it was HGV trailers and as you say yes it is the usual greased coupling or the eye. Yes my partner has mentioned it’s much easier to reverse an HGV as opposed to a caravan although he’s managed easily enough lol.Nobody is doubting your husbands credentials regarding towing but I expect that all the other trailers he has dragged behind the vehicle had the basic greased coupling or the eye.
A caravan is a different beast and does everything to throw you off balance and make you rethink your experiences.
With the introduction of stabiliser hitch heads they brought their own slant on towing and in particular, but not very well advertised, the need for a special towball for the Al-Ko hitch heads.
Unfortunately sales staff have very limited ability to inform buyers of what is actually required, whether deliberate or not, which is why a lot of things that should be mentioned are not at handover.
Having spoken to many HGV drivers, they all say that they would rather be driving a 40 tonne artic than a caravan !!!!
This is a Dixon-Bate pin and towball hitch.
There have been previous instances of caravans becoming detached from non- AlKo compatible towballs.
The green indicator has indicated that the hitch has locked but the caravan is only attached by the AlKo stabiliser rather than being properly hitched.
Past forum reports have shown that caravans have detached quite soon after the unit is moving so the O.P. was unlucky in this case.
The winding down of the jockey wheel to lift the rear of the towing vehicle is the best way to check that the hitch is correctly engaged as someone said earlier.
I hope that this unfortunate experience hasn't put you off DW 1311, nobody was hurt and hopefully the insurers will make things right for you.
It makes no difference if there are or not.
It does not need severe anything, the van moves quite alarmingly when being towed and even in good conditions it still moves about a lot and if the wheels are not balanced it jumps around like a demented rabbit !!
The Al-KO hitch is best performing with a level hitch to car attitiude, raise the towball height and the clearance between the back of the hitch and the towball is reduced.
Lower the towball and the clearance at the front of the hitch is reduced, which is why Al-Ko spent shed loads of money to research and produce the extended neck towball.
The same issues do not seem to affect Winterhoff hitches which will sit very comfortably on a standard towball.
Thank you for that information. The mystery deepens, though Damian's revelation that he has changed several Alko Hithches due to abnormal wear associated with "standard" 50mm balls adds to the possible permutations.Hi he drives HGVs but tows a variety of different size trailers not relating to HGVs behind the same pick up and has never had an issue, he’s got over 30 years experience towing.
Ours is higher than the measurement too now we’ve checked but would need to hitch caravan on to check level then and we always put the awning etc in the back of the pick up which would drop it. Caravan always looked level when hitched. Definitely worth researching as I would hate anybody to go through what we did on Friday night, it was terrifying.DW, we have just the standard tow ball on our truck, not the ball and pin type, and is used for the caravan and a plant trailer, both so far with no problems - did 8 outtings last year. Will have a good look at it at the weekend when on flat ground to check height etc. The dealer at the time we brought ours asked us a similar question as another customer said the towball was 19" from the ground and too high for their caravan, although ours has always looked right. You are making me wonder now?