Replacing the Overrun Damper and Hitch-head
On trip to Bellingham,Northumbria, when we stopped at the services on the M6 just before turning right onto the A69, I noticed what looked like grey oil dripping from under the handle. It was the oil out of the coupling damper. The result? Seized solid. The effect was for the caravan to "push" the car as the brakes were released when stopping, quite disconcerting! On arriving on site tried to push the hitch head in, wouldn't budge. Took it easy on the way home. The coupling damper would have to be replaced.
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First job was to remove the "A" frame
cover to gain access to the damper. |
Then take out the rear fixing bolt of
the damper. |
Removing the bolt and nut, both were
19mm. |
| 
Some are fixed horizontally, mine
was vertically held. |
To release the front of the damper,
the hitch had to come off. |
Once the bolts were removed had to
remove the end of the damper for it to
be extracted from the rear. |
| 
Old on top,new below. I reused the
old spacer as it was a better fit. |
I decided to fit a new hitch with
stabilizer, an upgrade. Greased the hitch
before attaching. |
The right hand bolt secures the front
of the new damper to the hitch head, the
torx bit is included in the kit. |
| 
Just pushed the damper from the
rear to replace the bolt, note the
spacer, goes on top. |
I found out the nuts are "use once"
type. New nut is Nyloc, important
it doesn't come off! |
This shows new nut in place and the
position of the spacer at the top of the
tube. |
| 
Re-fixed the "A" frame cover. Attached
the hitch lock.Job done. |
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The job was fairly straightforward once I realized the spacer on the end of the damper had to come out to extract the damper from the rear. Instructions came with the new hitch head again straightforward. Sourced the damper from Widnes Caravans who had spares on the shelf, most other dealers could "get" me one. The first place I looked was on Alko's web site but you cannot buy them from there?!
I decided to fit a new hitch as I did not have a stabilizer (must admit I have not had a problem towing, it's going to be interesting the next trip) and to get a good hitch lock. If I change caravan in the future, I will take it with me.
The costings: Alko Damper £56.55, Nyloc nut 19mm 47pence,Widnes Caravans.
Alko 3004 Hitch Triple Pack, a kit which includes the hitch, a safety ball and security lock £260, Barron's Culcheth.
Tools Required: Torque wrench, 19mm 1/2inch drive socket, screw driver and grease gun.
Page Updated 27th June 2007 | 
