How to Tighten Shakle Links on a Utility Trailer Suspension

Updated 04/07/2010 | Published 04/05/2010

Products Featured in This Question

Shackle Bolt with Locknut for Double-Eye Springs - 3" Long

(945)

$10.32

Question:

I have a small utility trailer and the shackle links upper bolt is very tight its just a plain bolt/nut but no bushing. at the bottom of the shackle link the eyelet of the spring actually has a bushing inside. Should there not be a bushing on the top as well??? If I tighten the top one how does the unit move to allow movement for the spring? Another question, I currently have three layer spring - I have no flex from the springs at all. My trailer bounces all over the road unless I have about 200 - 300 lbs of weight in it. I use a 4 hole 8 inch wheel. Can you help ASAP - my trailer is apart on the garage floor and grass cutting season is almost here! Thanks!!!!

asked by: Brian B

Expert Reply:

There usually is not a bushing in the upper bolt on the shackle links. When tightening the bolts on the shackle link you will want to get them tight but you do not want to over tighten them. Being tight will not keep the suspension from working properly but over tightening things could cause problems. The weight of the trailer and the suspension will allow the shackle links to move properly. When reinstalling the nuts on the shackle bolts make sure that you use locking style nuts so that the nuts cannot loosen and fall off when towing. Locking style nuts are meant for one time use and should be replaced, for safety, when removed. Most double eye springs require the Trailer Suspension Shackle Bolt with nut, 3 inch by 9/16 inch, item # 166081.

The number of springs in the spring pack really does not have much of an affect on the ride of the trailer, empty or loaded. The stiff ride you are experiencing when empty is normal to a degree and the spring and axle capacity is the determining factor for stiffness. If the springs installed on the trailer have a higher capacity than needed for the trailer the ride will be stiff and bouncy, especially when empty.

If your trailer is all over the road when towing empty you may need to check the springs and possibly change them out. A trailer bouncing about wears on the trailer and vehicle suspension and can be unsafe. The smaller wheel and tire combination that your trailer uses is also a contributing factor to the trailer bouncing when empty, especially at higher speeds.

I have provided a link below to some information about trailer suspensions that may help you out.

expert reply by: Robert G