Tandem Trailer Shaking

D

donaldboyer

Cadet
Joined
Oct 15, 2010
Messages
26
Hi All,

I have a 17ft Fibreglass Boat on a tandem trailer. At the weekend I noticed at certain speeds (80-90kph and also at approx 105kph) the sides of the trailer seem to rapidly shake up and down by approx 7cm. The shaking seems to be centered just in from of the wheels at the point where the trailer starts to angle inwards. I am concerned that the trailer or boat may become damaged. (although the boat does no move at all with the shaking).


Could it be that the wheels need balanced (I can only see the from pair from my driving position) as they almost seem to bounce on the road with the shaking? Or tyre pressures? Any advice would be welcomed.


Thanks
Donald
 
Cheetah 210es

Cheetah 210es

Petty Officer 1st Class
Joined
Dec 4, 2011
Messages
270
Re: Tandem Trailer Shaking

Sounds like axle tramp caused by incorrect tire pressures. That would be my 1st check.
 
Cheetah 210es

Cheetah 210es

Petty Officer 1st Class
Joined
Dec 4, 2011
Messages
270
Re: Tandem Trailer Shaking

The tire pressure will be stamped on the sidewalls.
 
tomdinwv

tomdinwv

Senior Chief Petty Officer
Joined
Jun 22, 2008
Messages
665
Re: Tandem Trailer Shaking

Check tire pressure first. While you are checking things, jack up the trailer and try to shake the wheels up and down/side to side and make sure they spin smoothly. Could be loose/bad wheel bearings. Probably not, but they should be checked every so often. If you have not done so in last couple of years, it would not hurt to pull the hubs and check and repack your bearings. Also check the condition of your tires. Look for knots or buldges. If everything checks out ok, you can have them balanced. Good luck, hope you get it fixed.
 
R

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Re: Tandem Trailer Shaking

Have tires balanced and check each tire for tread separation causing lumps/bumps on the treads or sidewalls. How old are the tires?
 
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