Sprung drawbar

[Tom D]

I have a red rock trailer with a sprung drawbar it has a 9.5 ton payload, when loaded it bounces a lot, building up a resonance giving a permanent bounce which clatters on the pickup hitch in an annoying way. The springs on the drawbar have bolts through them which could be adjusted, anyone know how to adjust them to get rid of the bounce?

[Al Smith]

Good question ,don't know myself .I've got a twin axle equipment trailer that does the same thing if empty .Loaded it does'nt do anything .The only help I've found is either drive above or below what speed it gets to acting like a Mexican jumping bean .It's usually between 45 and 50 miles per hour it gets the shakes .

[skyhuck]

Good question ,don't know myself .I've got a twin axle equipment trailer that does the same thing if empty .Loaded it does'nt do anything .The only help I've found is either drive above or below what speed it gets to acting like a Mexican jumping bean .It's usually between 45 and 50 miles per hour it gets the shakes .

 

If its an Ag trailer without air brakes it should only be doing 20mph:001_huh:

[Tom D]

Good question ,don't know myself .I've got a twin axle equipment trailer that does the same thing if empty .Loaded it does'nt do anything .The only help I've found is either drive above or below what speed it gets to acting like a Mexican jumping bean .It's usually between 45 and 50 miles per hour it gets the shakes .

 

does that have any adjustment on it?

 

Mines a tractor type trailer.

[garth mc garth]

Have you tried altering tyre pressures on tractor to see if it cures it? How worn is the hook on the pickup hitch?

[Tom D]

hitch hook is ok, I wouldn't want to mess with the tyre pressures, I might try tightening the springs and see if that does anything.

[garth mc garth]

How quick does the valtra go? Does the trailer do it at all speeds?

[Aaron]

you can ajust the srings, big spanner and a bar

[Tom D]

Should I tighten or slacken them?

 

Tractor does 40k only does it at near top speed.

[Aaron]

if i remember the tighter the stiffer and vice versa, we had a nc low loader wich did the same, we tightend them to stop the bounce.