How to wind springs on trailer ramp door

To properly size a ramp door spring system, please complete the following form. We will crunch the numbers for you and provide quick feedback on the right system for you.

how to wind springs on trailer ramp door

Alternatively, you can complete the following sheet and send it back to us. M-3 Spring System Spec Template. Springing weight — Weight of the ramp at the beginning of the spring cycle.

Determined by placing a scale under the open door with no spring system attached.

how to wind springs on trailer ramp door

Door Height — It is also helpful to know the distance from the top of the door to the end of the open door. This is an easy check to be sure the cable will be long enough. This is a safety precaution that insures that the cable does not disconnect from the drum.

Header Width — Width of available headroom inside of the trailer. This determines the length of tube in the spring assist. Fill in the relevant information and send it to us. We will respond with a system that will meet your needs.

The tube on spring systems can be shortened by cutting the tube with a hacksaw and re-positioning the component parts on the resulting narrower tube.

The springs will grow in length as they are wound so it is possible to cut a tube too short. Suggested fix — Close the door and secure it. Go inside the trailer and loosen the set screw on the cable drum that the cable is coming off of.

After loosening the set screws wind the cable up on the drum until it is finger tight. Tighten the set screws. Open and close the door a couple of times to set the cable into the grooves of the drum. This should correct the problem. If it does not — either the door is racked or the rear hoop frame of the trailer is racked. Both drums are the same diameter and they move on a common shaft at the same speed.

The only variable is the squareness of the door and trailer frames. Racking of frame components is not a situation M-3 can correct with the spring system. Questions regarding the placement of cable drums spools usually fall into one of two categories. Can I cut it down? Where do I re-position the spools? Answer — The drums spools are never placed exactly where they will be on the tube after installation.

We position them at the factory for ease of shipment. The installer always has to position the drums. They should be positioned as far apart as possible, just inside of the door opening so that the cable cannot rub the door frame when the door opens and closes. Can I cut the tube without effecting the performance of the system.

Answer — As the springs are wound to create the tension that lifts the door, they grow longer in length. This will take lift force from the system and it will so cause premature failure of the system and the door will be too heavy. What is the minimum space needed for the springs to function properly?

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Here is the formula to calculate minimum tube length:. Unusual Trailer Size — Custom Options Spring weights — Springs are stocked at M-3 to handle doors with springing weights of 45 lbs through lbs. Trailers with extra heavy doors — If the springing weight of the door exceeds lbs, M-3 recommends you complete our M-3 Spring System Spec Template.JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Find all of the technical information articles displayed in alphabetical order. Click on a title below to read more about the subject. The springs used for trailer ramps, doors, hatches, gates and lids are torsion springs. These springs are made up of round wire helically wound to make coils. The ends of torsional springs are known as legs for the wire on the end coils sticks out as if it were a lever. The the torsion spring legs are what allow for your gate, ramp, door, hatch, or lid to apply a rotational force on the spring making it deflect within a range of There are a few formulas an guidelines to follow before purchasing torsion springs for your gate, ramp, door, hatch, or lid.

To calculate the amount of torsion spring rate per degree you need, multiply the length of the rampby the weight of the ramp by two and divide the product by the degrees your spring must travel including pre-load as shown in the example and diagrams below. Search Entire Catalog. Basic Search Search More Fields. Please fill in one or more fields to narrow down your search. Search Reset Form. Phone Number. Part Description. Quantity and other important details.

Definition: Torsional torsion springs designed and manufactured to be installed into gates,trailer ramps, doors, hatches, and lids to complete a leverage function by making it easier to lift or lower the gate, ramp, lid, or door.

Formula Diagram.STOP right there them spring's are under alot of pressure. Adjustments should be made by a service tech. My rear door only opens about 12 inches and then gets really tight and looks like the cables want to come off of the cable spools. Looks like about the same set up as a garage door but not sure if you adjust the same way. Yes they are identical to a household garage door. Not brain surgery -- just respect the tension and understand how it works before loosening anything and adjusting.

I've successfully adjusted mine a few times to make them work better, after changing the weight of the doors by adding traction mats and so forth Of course I've installed garage doors alone before too If you don't fully understand and respect garage door springs, don't mess with them. But any garage door guy can glance at it and adjust them for you in 10 minutes or less But if you stand in a smart location to the side, and take the correct precautions, even if the bar happens to get away from you it'll scare the snot outta your pants and fly some distance and make a big noise, but they won't hit you.

The spring can't leave the winding bar anyway, so there's no risk at all of that going anywhere, even when something goes wrong or if it suddenly breaks. Tried to adjust one when I was young and foolish. Only took 12 stitches to patch the gash in my hand. If you made it tighter, then you need to go the opposite direction of whatever you did, if you are trying to release the tension.

Door open or closed shouldn't matter it's pretty obvious which way you need to go when yo have spring bars in your hand depending on whether you're trying to release or add tension. I adjusted mine with the door mostly closed, but propped open enough There is less tension on the springs when it is closed -- more when it is open and the cables are pulled all the way out.

But bear in mind my only objective was to add a few turns and slightly increase tension All I was doing was adding a bit more tension to my springs to help them lift more weight But your goal is far different from what mine was.

Frankly I can't make sense out of what your issue if you're saying the door actually won't open all the way at allDownload Printable Brochure. Trailer ramps make it easy to load heavy construction, trucking, landscaping, and other equipment and move it from one place to another.

However, in order to take advantage of the full functionality of a trailer ramp, you need to make sure you are using the right kind of trailer ramp springs to handle the weight of the ramp for easy opening and closing.

A trailer ramp spring is installed at the hinge mount where a ramp connects to the trailer in order to make it easier for the ramp to be lifted up or lowered down. If you are looking for trailer ramp springs that will make raising and lowering heavy trailer ramps easier, Wermke Spring can help.

Adjusting Torsion Spring

We are a spring manufacturer that offers a wide variety of springs for all types of applications and all kinds of industries. We manufacture, stock, and distribute trailer ramp springs in a standard size and dimension that is designed to work efficiently and universally with almost all ramp applications. However, if your trailer ramp requires customization, Wermke Spring technicians can manufacture custom springs as needed to fit your specifications.

To learn more about the trailer ramp springs we offer and to request a quote, please contact us at Trailer ramp springs are created by making a coil out of spring tempered metal wires.

Both ends of a trailer ramp spring stick out like a lever. The specifications for our universal trailer ramp springs are as follows:. Whether you are a trailer manufacturer with ongoing needs or you are simply repairing one or two trailers for use, we manufacture high-quality trailer ramp springs that make raising and lowering ramps a breeze.

Our trailer ramp spring product is universally suitable for various ramp applications or you can have a spring customized and manufactured according to your needs. For pricing inquiries, initial quotes, and customization requests, you can contact us at Lark Ind.

Fenton, MO Download Printable Brochure Trailer Ramp Springs: Universal Ramp Springs Trailer ramps make it easy to load heavy construction, trucking, landscaping, and other equipment and move it from one place to another. Trailer Ramp Springs: Specifications and How to Use Them Trailer ramp springs are created by making a coil out of spring tempered metal wires.

Any more than that and the ramp can still be raised, but there will not be any more load assist.

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In order for you to determine the approximate amount of torque needed by your ramp, you need to figure out the weight of the ramp and the ramp length in inches. Then, divide the length of the ramp by two and multiply it by its weight. When installing trailer ramp springs, keep in mind that the direction of the coils is important. Lay the spring on its side resting on the ends of the coils looking at end of coils then follow coils as they are down and away, if the movement is counter clockwise than this is a left hand wind.Cargo Systems recommends our spring assemblies only be installed, adjusted or modified by the original trailer manufacturer or an authorized dealer.

Under no circumstances should the end user attempt to modify, adjust or replace a torsion spring assembly.

Ramp Door Spring Systems FAQ

We require the weight of the door and door dimensions to determine the proper spring assembly system for your installation.

We will help calculate the door weight, if needed, to help determine which assembly is right for your application. We create specialized assemblies for doors with extra height, aluminum or steel tread plate, extra steel in the door or special flooring.

We have customized assemblies to properly lift doors that are heavier up to lbs. Ramp-Heister spring assemblies are designed for ramps of various weights, from lb. Always use the model designed for your door weight and height. If in doubt, or for any special situations, contact Cargo Systems at Provide us with door width, height, and weight and we will provide springs for any special situation.

This tension chart has been developed by Cargo Systems, Inc. We will advise you on proper placement of cable anchor bracket and number of turns for safe, proper operation so spring is not over stressed. Home Cargo Systems Install. How to get the best results for safe, smooth cargo door operation. Proper installation is essential for safe, smooth operation. Measure inside trailer width.

how to wind springs on trailer ramp door

Lay aside. Check cable drums — drum stamped RH on curbside, drum stamped LH on driverside. Leave set screws loose. Galvanized bearing plates should be on outside of mounting angle, so that the shoulder of bolt fits in punched slot. Tighten four nuts securely. Stationary end of spring mounts on the curbside.

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Mount cable anchor bracket securely on ramp with through bolts. Install cable stop in slot of cable drums. Check all nuts and bolts on mounting assembly for proper tightness. Vise grip will lie against header to stop shaft from turning.

Wind loose cable onto drum — start with RH curbside drum. Set cable taught and secure set screws. Wind drums up toward ceiling. Now set cable taught on LH drum and secure set screws. By starting with RH drum, cable slack will be minimized. Wind tension onto torsion spring with ramp open. Caution should be exercised to see that bars are properly sized and seated before winding.

An improper winding tool can rupture the casting and cause bodily harm.

Wind spring down toward floor. Tighten Set Screws once spring s are wound properly.

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Remove vise grip from spring shaft. Check ramp for proper balance. Turns may be added or subtracted to achieve balance.The winding pucks face each other. Have two new cables and know how they came off the drums.

Look at the twist on the spring to determine which way to wind it.

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It depends on the spring; unfortunately no set answer. You'll know immediately if you're going the wrong way at the spring will seem like it's unraveling instead of winding. You'll need to put a pair of visa grips on the shaft that holds the springs to prevent it from turning while you are winding.

Usually it's one rotation from every foot height of door. Only 1 thing about above On a trailer door? I say just the opposite. Basically you want to wind the springs with the cables extended. On a garage door the spring is under most tension when the door is closed cables are extended. But on a trailer door the spring is under most tension with the ramp door open again cables are extended. Not to mention on a garage door there is no possible way to wind the springs with the door open because the door is in your way And most likely the same situation with a trailer door So open the door, extend the cables, and let some light and space in.

So as a complete non-expert, but someone who has adjusted his own trailer doors and installed several garage doors with zero training or experience, here are my answers to original questions:. Wind in the only direction that the springs will start to tighten However many turns of the springs that it takes to make the door comfortably light enough to lift.

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Simple trial and error. Wind for a while. Tighten the set screw. Test the door. If it's still too heavy loosen set screw and wind them tighter. And if the door starts to lift and close by itself while you're winding? Whoops you've gone too tightIs this something that I want to mess with? I have an MTI custom trailer with a 7k lb cabable rear door. The trailer can carry a car. I bought it used, and the rear door spring assist has never worked.

The whole mechanism is nicely? It is flockin heavy, and I worry it might get damaged or cause harm to someone not prepared to grunt the door to the floor! Take it somewhere? Like This Unlike XP 17 Jan Anytime you wind a spring on a garage door or in this case trailer door you wind it when the spring will have the most tension. This is why you need to have proper tools and knowledge because this is when the springs are most dangerous and you can hurt yourself.

Trailer Ramp Springs: Universal Ramp Springs

I have installed many garage doors and have replaced many springs over the last 35 years. In both cases with these doors when they are up open for a garage door and closed for a trailer door there is very little spring tension. There is just enough to barely hold the door up.

I would recommend that anyone who doesn't have the tools or knowledge to do this get some help. There have been many novice do it yourselfers who have hurt themselves messing with these springs. Share Share.

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