Trailer Ramp Door Spring Assist Adjustment

When starting a new torsional trailer spring design you must know the following parameters.

Trailer ramp door spring assist adjustment.

I have a 7 enclosed trailer with rear ramp door that has 2 torsion springs. 7 wide 2 wheel 1 spring. So the spring is under substantial tension at the adjuster collars always. Initial fabrication of trailer ramp assist spring.

Plus my spring itself has about 7 full winds on it even with the trailer door closed. Trailer ramp springs are heavy duty torsion springs which work as a lift assist to take the majority of weight off of the gate ramp lid. 5 and 6 wide 1 wheel 1 spring. A typical horse trailer or utility trailer ramp uses 3 4 inch hinge pins and would require two ramp springs with a 3 4 inch inner diameter.

Cables are wound on drum and 1 shaft is clamped with vise grips to prevent. So my door had to be at least propped open almost 2 feet. The winding pucks face each other. 8 and 8 5 wide 2 wheel 2 spring.

All mounting hardware included except for mounting bolts. Sizes range from assists for 5 wide trailers to 8 5 wide trailers. The ramp springs that we carry fit 1 1 2 inch diameter hinge pins and are designed for use with heavy duty steel ramps like those on equipment trailers or car haulers. But all trailers are different so this might be an alternative.

You will find that design assistance here in this article. Since 1982 all metals supply in oroville ca has provided metal processed metal and industrial hardware to northern california repair shops and industry and manufacturing. The door must be open during the adjusting process. Overhead mounted spring assists allow easier closure of trailer ramp doors.

Ramp door spring assist overhead. The mounting bracket has two 3 8 holes that allow the installer to bolt the spring to the rear header. The overhead ramp door spring system is designed for enclosed trailers. Press brake bend.

My trailer door is an easy 500 lbs and as i remember it has 5 turns on the springs. You might also consider taking the trailer to someone who sells them for the adjustment. The system features a double drum and cable. Have two new cables and know how they came off the drums.

Again be very careful and have a helper with you. Unit is completely assembled cables sold separately.