1. Trailer Ramp Springs
  2. M-3 and Associates
  3. Dual Ramp Spring
  4. 84 Inch Wide Doors
  5. 120 lb Capacity
  6. Conventional
Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 120-lb Capacity

Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 120-lb Capacity

Item # ERS120D81
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Trailer Ramp Springs
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ERS120D81 - 120 lb Capacity M-3 and Associates Trailer Ramp Springs
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Replace your old trailer door spring with this heavy-duty, conventional ramp door spring. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of your ramp door freefalling. Lowest Prices for the best trailer ramp springs from M-3 and Associates. Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 120-lb Capacity part number ERS120D81 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (153)
  • Q & A (56)
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M-3 and Associates Trailer Ramp Springs - ERS120D81

  • M-3 and Associates
  • Dual Ramp Spring
  • 84 Inch Wide Doors
  • 120 lb Capacity
  • Conventional
  • 81 Inch Wide Spring
  • Steel

Replace your old trailer door spring with this heavy-duty, conventional ramp door spring. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of your ramp door freefalling.


Features:

  • Ramp door spring lets you easily lift and lower the door on your enclosed trailer without risk of injury
    • Helps to take on the weight of your trailer door so you don't have to
  • Dual springs eliminate the risk of the ramp door collapsing and causing damage or injury
    • If one cable falters, the other spring will prevent the trailer door from freefalling
  • Spring reduces wear and helps prevent damage to door hinges
  • System can be modified to fit your specific application
    • Slide the bracket and cable drum down and cut the shaft to a shorter length
  • Sturdy steel construction
  • Made in the USA


Specs:

  • Application: 7' wide trailer door
  • Dimensions: 81" wide
  • Spring capacity: 120 lbs
  • 1-Year limited warranty


Warning: It is recommended that only individuals who have experience winding torsion springs install this product. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install this system.



9500470 M-3 Enclosed Trailer Ramp Conventional Springs - Dual Spring - 120 lbs - 81"






Customer Reviews

Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 120-lb Capacity - ERS120D81

Average Customer Rating:  4.8 out of 5 stars   (153 Customer Reviews)

Replace your old trailer door spring with this heavy-duty, conventional ramp door spring. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of your ramp door freefalling.

- ERS120D81
by:

Very easy to order, Quick deliver, the parts arrived in good condition even thogh the boxes was ripped open during shipping, I have not had time to install it yet o . so no picture is available. 704168


Comments
Easy to install, work great. money well spent.
John W - 09/16/2020

99070

- ERS120D81
by:

Everything fit perfectly and worked as intended 715053



- ERS120D81
by:

Exactly what it says it is. Looks like a nice piece. Easy installation. Best deal on the internet. I searched for probably hours trying to find a better deal and you wont. They didnt have it in stock but ended up shipping it straight to me and I had it before they thought I would. Great Service. Very easy to work with. Will always come here and look for future trailer parts. 487279



- ERS120D81
by:

Yes, I know it is recommended for personnel whom have utilized a torsion spring before, but I am definitely on the stubborn side. Before I could contact my local garage door guy, I pulled this out of the box to see if I needed to make a modification. So, I shortened the bar. I then noticed that the old one had to come down. Then I happened to notice that the placement of the plate almost lined up to the old one. Two minutes later, I was too far in the installation to not finish this job myself. Total time it took me was 1hr45min. 15 of those minutes were spent unwinding the cables because I didn't read the directions to put it on with the ramp down. Other than that, it was a breeze. Customer service was also the most amazing experience ever. I called to make sure I was ordering the right part from Pace and they informed me that my trailer was to old and to go to a recommended dealer 30 minutes away. etrailers crack staff told me to go out and measure my trailer twice, to make sure it would fit. Voila, 2 minutes later, i knew I had the right part. 480071



- ERS120D81
by:

Directions can be a little confusing, since I installed this on a she door, not a enclosed trailer. Left and right are painted and all was clear except on which way cable winds on drums, according to rep you wind it thru front unlike a garage door. Called to confirm because drums are labeled r and l but are reversed as your installing it,which prompted a call call. 506038


Comments
Thanks for the follow up Brandon. This system is set up so that when you are in the trailer or shed in your case looking out of the down door, the end with the black cable drum and the red winding cone should be on your left. If you are not comfortable or experienced with the installation of torsion springs, it is highly recommended that a local garage door company complete the installation.
-- Rachael H - 05/31/2018

39118

- ERS120D81
by:

The mounting plates are adjustable so there adjusted to fit my Pace 16' trailer perfectly. I had to install the cable pulleys backwards from what the directions called for and with the set screws facing the outside walls as well. I installed mine with the door closed not open against what the directions say as well. When you put some tension of the springs with the door closed you must stretch out the springs some before using the set screws. If the springs are not stretched out some the door will barely open and stop because the springs will have to room to turn and expand. The real trick is getting the cables wound up even and tightly. I needed my parts ASAP so I paid next day air which was very cheap for such a large part. 190413



- ERS120D81
by:

Works great on the ramp door that I built for a storage shed to keep golf cart in. 575900



- ERS120D81
by:

First off, Deborah was awesome to deal with and had the ramp door spring shipped super fast. Thank you! I had never installed a torsion spring and this one took me two hours, including removal of the old one off a Pace cargo trailer. You might need to cut off part of the tube ends to fit your application. I put a grinding wheel on my skilsaw and chopped off 3 inches from each end. I used my existing mounts on the header and so I removed the ones on the new spring assembly...4 bolts. The mounting plates on the assembly are easy to slide to fit my application. Installation onto the header was very quick and easy. Again, four bolts that are a bit soft and easy to strip...I used my existing hardened bolts that were exact match in every respect...only harder alloy. The cables came next. I suggest using existing hardware if it's in good shape. The provided pins and cotter pin mount left too much slop at the ramp. Good bolts and a good locking nut was what I used and allowed for plenty of relaxed movement without compressing the eye of the cable end. Vise grips come in handy when rolling the cable on the drums as you'll want to keep the bar assembly from moving while loosening the drums to roll up the slack of the cables...tighten the two set bolts on each drum and you're ready to start winding the springs. Make sure the BLACK drum is mounted to your left while looking out from inside the trailer or the entire assembly will need to be flipped. I used some rebar for winding rods and ground them down a touch to fit easily inside the cavities of the spring winder. This worked well for me, but the proper winding rods are no doubt safer and should be used or simply get a professional garage door company to do the winding part and balancing for safety reasons. Once wound according to the instructions, lock the set bolts onto the rod and you can remove the winding rods. I used the top of my trailer to help hold the rod while tightening the set bolts...all the while holding another rod in the cavity for safety. From there, you will want to readjust your drums on the cables to get an equal amount of tension on each cable. One cable will likely be a lot tighter while the other relaxed upon rasing the ramp. With the door up and closed, loosen the drum set bolts on the LOOSE cable drum and spin it to get a tighter cable and lock the bolts back into place. Raise and lower the door a time or two and go back into the trailer with the door closed and readjust the drum that has cable slack until they are fairly equal. That was it and other than the appeals for safety around the entire process, it was easy to do. Unless you are used to working around stuff like this, I think having a garage door company wind the springs and adjust the drums would be money well spent to avoid any potential injuries. I doubt it would cost much because that part goes pretty quickly and they would have the experience to do it in about 15 minutes or so. 128509



- ERS120D81
by: 09/25/2020

It was great worked and had no problems getting it, thank you 892419



- ERS120D81
by:

The gate spring worked great and still is after a year. before I was lifting this gate by hand. This gate is several hundred pounds. With this system I can lift it with one hand with ease,well worth the money. 830221



- ERS120D81
by:

Still works like new. No issues. 740188



- ERS120D81
by:

Easy to install 735108



- ERS120D81
by:

I installed this on a heavy fold-down ramp door that I made for hauling my Jeep in an enclosed trailer. The ramp was so heavy that I couldn’t hardly lift it by myself. I bought the dual spring model because I thought I needed it, but I don’t. One spring is all I needed. I can now lift the heavy ramp door with one hand. 728987



- ERS120D81
by:

Awesome exactly what I needed!! Ill be ordering a lot more. As they are the key element of my business!! 721486



- ERS120D81
by:

Good product. Wish it had come sooner. 719986



- ERS120D81
by:

Works just like the original. 716533



- ERS120D81
by:

Great easy to install 607948



- ERS120D81
by:

Good product and easy to install. I can now lift the ramp on my trailer with one hand. 603399



- ERS120D81
by:

I received it in a short time but haven't installed it 600309



- ERS120D81
by:

Well so far it looks right but have not installed it yet 581546



- ERS120D81
by:

Fast and accurate description. Great job! Thank you! 563076



- ERS120D81
by:

Very good ---went on fast, cut a little bit on the end to on header, came in fast just in time door was getting heavy, Im a landscaper 552767



- ERS120D81
by:

fast shipping fit correctly works great would buy again 543393



- ERS120D81
by:

great product , fast delivery ,easy to install !! 541943



- ERS120D81
by:

PROMPT SHIPPING, EASY INSTALL, WORKING GOOD 515866


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Show More Reviews

Ask the Experts about this M-3 and Associates Trailer Ramp Springs

  • Available Trailer Ramp Spring with a Measurement of 70 Inches Between Cable Rollers
    I found a trailer ramp spring that will work for you application. The Enclosed Trailer Ramp Spring, # ERS120D81, that has a measurement of 71-5/8 inches from cable roller to cable roller. The overall length is 81 inches long. The attached picture will give you the full dimensions for this spring.
    view full answer...
  • Dimensions For Trailer Ramp Spring On 18 Foot Haulmark Trailer
    You will need to measure to be sure, but I believe the Enclosed Trailer Ramp Spring - Dual Spring, 81" Wide # ERS120D81 will fit your 18 foot Haulmark Trailer and I've included the dimensions of this hit for you. Each spring is 22-1/2 inches long and 2-3/8 inches in diameter.
    view full answer...
  • Recommended Spring to Help Close Ramp on a 2006 Gearbox Toy Hauler
    The Enclosed Trailer Ramp Spring # ERS120D81 that you referenced is an excellent option to help you lift the ramp on your 2006 Gearbox Toy Hauler. It has a 120-lb weight capacity so if your door weighs over 120 lbs, say 150 lbs for example, then you would only be having to lift that extra amount, which for example would be 30 lbs. The 81 inch width will fit great once installed since your door is 96 inches wide. If you do not have experience winding torsion springs then we recommend...
    view full answer...
  • Weight of Enclosed Trailer Ramp Spring ERS120D81
    Though I can't give you a reason why, I can tell you that the Enclosed Trailer Ramp Spring # ERS120D81 has a shipping weight of 27 lbs, which is going to be very close to what the actual product weight is. It is 81 inches wide with a 120 lb capacity and has 2 springs on the assembly. I've added a link to a video review of this product for you to take a look at as well.
    view full answer...
  • Replacement Torsion Spring Cables for Enclosed Trailer
    We do offer cables alone for enclosed trailer ramp torsion springs. Part # CAB1-8CB150 is a pair of 150-inch cables. We also offer replacement right and left drums, parts # DRUM-M-3RH and # DRUM-M-3LH, respectively. The installation instructions for this product are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install this system.
    view full answer...
  • Recommendation for Enclosed Trailer Ramp Springs for a 7 Foot by 14 Foot Enclosed Trailer
    The system that will probably work best for you is the Enclosed Trailer Ramp Spring - Dual, 81 Inches Wide, # ERS120D81. I went out to the warehouse and measured the distance between the mounting brackets. It is 64-1/2 inches from bolt hole center on one bracket to bolt hole center on the other bracket. The overall length is 81 inches. Since you have a 7 foot (84 inch) wide trailer, the 81 inch assembly should be a good fit. The installation instructions for this product are recommended...
    view full answer...
  • How to Pick Out Replacement Cable Length for Trailer Torsion Ramp Spring
    You would want to measure from the bottom of the ramp door all the way up to the spring above the door frame when it is open to determine the minimum length cable you would need for your spring. We do offer cables alone for enclosed trailer ramp torsion springs. Part # CAB1-8CB150 is a pair of 150-inch cables. The installation instructions for this product are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system...
    view full answer...
  • Recommended Ramp Door Spring for 8 Foot Wide Enclosed Trailer
    You'll want to choose a spring that's the same width as the ramp door. I'm afraid that the # ERS120D81 you mentioned would be too narrow. You'd want to use #CB250D96SHD, which is 96 inches wide. You'll have to take about 2 inches off each side of the pipe, but this would be your best bet. We HIGHLY recommend having the spring installed by somebody who's experienced with torsion springs. Tensioning the spring is a dangerous job that shouldn't be undertaken by somebody who's not familiar...
    view full answer...
  • Availability of Replacement Mounting Hardware and Cables for ERS120D81 Trailer Ramp Door
    We carry the replacement cable you're looking for as part # CAB1-8CB150, but M-3, the manufacturer doesn't offer the mounting hardware as an item that's sold separately.
    view full answer...
  • Enclosed Trailer Ramp Dual Spring for 72 Inch Wide Door
    You can use the 81 inch ramp spring # ERS120D81 if you would like. The springs and pulleys are held in place with set screws, so you can move the springs closer together and tighten the set screws down to keep the springs and the pulleys in place. I spoke with the manufacturer, M-3, and they said that this spring will work well on your 72 inch wide door. M-3 said the spring will work on doors down to 62 inches wide. You will want to position the pulleys as far apart as possible without...
    view full answer...
  • Can 81-Inch Enclosed Trailer Ramp Spring # ERS120D81 Be Cut Down in Length
    According to my contact at Redneck Trailer Supply the M-3 Enclosed Trailer Ramp Spring # ERS120D81 can be cut down to a reduced length, so this won't be an issue at all. The installation instructions for these products are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install this system.
    view full answer...
  • Overhead Clearance Necessary to Install Enclosed Trailer Ramp Spring ERS120D81
    According to our friends at Redneck Trailer Supply, the reel on the end of the Enclosed Trailer Ramp Spring, # ERS120D81 measures 5 inches in diameter, so you would need a bit more than 5 inches of room on the header above the rear door of your snowmobile trailer.
    view full answer...
  • How is M3 Enclosed Trailer Ramp Spring ERS120D81 Measured
    The M3 Enclosed Trailer Ramp Spring # ERS120D81 is 81-inches wide as measured tip to tip; this is noted in the linked video at the :45-second mark. The installation instructions for this product are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install this system.
    view full answer...
  • Ramp Door Spring for 72" Wide Door on Wells Cargo Trailer
    What you can do is use Enclosed Trailer Ramp Spring - Dual Spring, 81" Wide # ERS120D81 which will work for doors which go down to 62 inches wide. You can take a look at the video review of this product I've added for you.
    view full answer...
  • Ramp Spring Recommendation for Cargo Trailer with 75 inch Wide Ramp
    The spring # 362SW61 can be cut down to the 75 inches you referenced. There is a capacity of 150 lbs. If you prefer this over the spring # ERS120D81 which will also work you can absolutely do that to gain the additional 30 lbs capacity.
    view full answer...
  • Torsion Ramp Spring Replacement Recommendation for Horse Trailer
    We have torsion style ramp springs like the part # ERS120D81 that you referenced. This is 81 inches long an has a capacity of 120 lbs. For a wider spring we have the part # CB250D96SHD which is 96 inches in width and has a 250 lb capacity. It can be cut down as small as 80 inches if the length is an issue.
    view full answer...
  • Overhead Ramp Spring for Rear Door of 2005 Featherlite 1648 Snowmobile Trailer
    The spring needed will depend on the inside width of the trailer and the weight of the door. I looked online found that the Featherlite 1648 is 8 feet 6 inches wide. I'd recommend the # CB250D96SHD from M-3 Industries. The assembly is 8 foot long, and has a 250 lb capacity, which should work well for your trailer. Unless you have experience installing torsion springs, please leave the installation of this spring to a professional.
    view full answer...
  • Longer Version of Enclosed Trailer Ramp Spring part # ERS80S66
    We have the Enclosed Trailer Ramp Spring part # ERS120D81 which is 81 inches long as compared to the # ERS80S66 which is 66 inches long and no longer available.
    view full answer...
  • Using an Electric Winch to Raise and Lower a Ramp Door on a Logan Horse Trailer
    With an Enclosed Trailer Ramp Spring # ERS120D81 when the door is lowered it will pull the cables which will turn the pulleys and put tension on the springs. The cables could not be detached with the ramp door lowered because the springs would suddenly lose tension and they could break and that is very dangerous. What I recommend doing is just using a winch with a system of pulleys (or you could mount the winch above the door at the center so you won't have to use pulleys). Once the...
    view full answer...
  • Adjustability of Enclosed Trailer Ramp Spring
    I spoke with my contact at M-3 who said the ramp spring shaft can be cut down to a maximum of 62 inches and you would still have room to wind the springs. The shaft is made of steel tubing so the proper saw or power saw blade would cut through it. Be sure to get a straight cut and file down the rough spots. The installation instructions for this product are recommended for individuals who have experience winding torsion springs. If you have not worked with a torsion spring system before,...
    view full answer...
  • Width of Doors That Dual Spring Enclosed Trailer Ramp Spring Works With
    I am not 100 percent sure what you mean be fitting the same place as the 66" Enclosed Trailer Ramp Spring ERS80S66 but I can tell you the 81" Dual Spring Enclosed Trailer Ramp Spring # ERS120D81 will work on doors down to 62 inches wide so if your door is within that range it will work for you.
    view full answer...
  • Ramp Spring Recommendation for a 2002 Range Renegade Enclosed Aluminum Snowmobile Trailer
    I have a solution for you, but it won't work with the spring mounts you currently have on your trailer. I would recommend the Enclosed Trailer Ramp Spring # CB250D96SHD. This is a 96 inch wide spring with a 250 lb capacity that is wider than the spring you recommended that should better match your door ramp width that should do well for you but it will require you mounting it directly to your trailer and not use the mounting brackets you already have. The installation instructions for...
    view full answer...
  • Troubleshooting Ramp Door Spring Not Opening Properly After Snapping Cable with Reinstall
    Sounds like the torsion spring of your ramp door assist hasn't been wound properly and that's why the door isn't opening properly. This can be a dangerous endeavor so recommend you find someone with experience winding torsion springs and have them get everything set back up at the proper tension. Local garage door companies would be who to check with.
    view full answer...
  • Recommended Dual Spring Trailer Ramp Assembly For 2000 Haulmark Trailer
    We don't have the replacement spring, but we do have the Enclosed Trailer Ramp Spring - Dual Spring, 81" Wide # ERS120D81 to replace the entire assembly. This will give you the spring, the drum, the bar, the brackets and the cable. This unit has a spring capacity of 120 lbs. This product is designed with dual cables so in the event that one is accidentally cut, the ramp door will not free fall to the ground.
    view full answer...
  • Dual Ramp Spring Recommendation for Ramp Door that is 78 inches Wide
    An 81 inch long dual ramp spring like part # ERS120D81 would be your ideal solution. Your ramp door is 78 inches long so this being a few inches longer would be ideal.
    view full answer...
  • How Many Turns of Spring is Recommended for M-3 Enclosed Trailer Ramp Spring # ERS120D81
    I checked with M-3 and when you are ready to wind the spring on the Enclosed Trailer Ramp Spring # ERS120D81 you will need to use two 1/2 inch diameter bars (of around 18 inches long). You will insert the first bar into the winding cone of the spring and pull down. The system is then designed for 10 full revolutions of the spring. It will be easier to balance the door if the spring is wound in quarter turns. Please note that we highly recommend only installing this if you have had previous...
    view full answer...
  • Measuring to Pick Out Replacement Ramp Spring for Enclosed Trailer
    You'd want to measure the width of your door opening/ramp and then go with the ramp spring that fits just to the inside of that. The part # ERS120D81 you mentioned is 81 inches wide.
    view full answer...
  • What are the Dimensions of the Enclosed Trailer Ramp Spring ERS120D81
    You did not mention what specific dimensions you were looking for, so I took several. I then produced a pictured showing the measurements. The blue arrow indicates the center to center distance between the mounting holes. The green arrow is center to center between the drums. The yellow is the space between the spring assemblies. Purple is the length of a spring assembly. The drum is 2-1/2 inches wide, 4-3/8 inches in diameter. THe spring is 2-3/8 inches in diameter (not under tension)....
    view full answer...
  • Max Width of 81" Enclosed Trailer Ramp Spring # ERS120D81
    I reached out to M-3 about the dimensions for the Enclosed Trailer Ramp Spring # ERS120D81 and while he wasn't able to tell me the overall dimensions we believe that the absolute max amount of room you'd need is 91". This is listed as 81" wide but I'm not sure if that is the overall width or just the width to the mounting brackets. If 81" is not the overall width then you'll likely be in the ballpark of about 91.
    view full answer...
  • Cable Length Recommendation for Having 115 Inches from Ramp to Spring for Trailer Ramp Spring
    Since you need 115 inches of cable between the spring and the ramp the size cable I would recommend is the 150 inch cable part # CAB1-8CB150 and you'd be set.
    view full answer...

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Info for this part was:

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Installed by:
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Installed by:
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Updated by:
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