Solution for Needing Replacement 2 inch Ball Belcrank Surge Coupler  

First you will need to remove the old hydraulic equipment. Remove the surge coupler or actuator, remove all the lines, and finally remove the brake assemblies. If you have 10 inch diameter hub and drums, you may need to replace those as well. If…

You can convert surge brakes to an electric over hydraulic braking system. To do this, you will need an electric over hydraulic actuator and a brake controller. For an electric over hydraulic actuator, I recommend looking at the Carlisle HydraStar…

The mounting bolt holes on the Demco Hydraulic Trailer Brake Actuator #DM72VR that you referenced are spaced apart exactly 3 inches, on center. From the center of the rear bolt hole to the end of the unit there is a distance of just under an inch…

I would be happy to help you. The Brake Actuator with Manual Lockout - Bolt On - Drum - 2" Ball - 7,500 lbs item #T4500600 you referenced is recommend to be mounted on a 3" wide tongue. It is an industry standard actuator and has an inside…

The coupler latch assembly shown in the attached dimension photo shows the latch in the open position of #8605001. When the coupler trigger latch is closed the wedge simply needs to be on the underside of the hitch ball. As long as you can't lift…

The Demco Hydraulic Trailer Brake Actuator part #DM72VR will be a direct replacement for a DA66B. It will mount using the same holes so install will be a breeze. The bottom hole can be left untouched.

I checked with my tech contact over at Demco and he tells me that as long as you're able to find shims that will work, you can use the Demco #DM72VR on your trailer with 2-1/2" channel tongue. You're likely going to want to try to find…

The mounting holes of the Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs #DM8669112 are in the same exact locations as you mentioned. From front bolt to second bolt center to center is 3 inches. From the front bolt to…

While the install instructions link for the #DM5939 does seem to be not working I was able to find a diagram that shows how this installs on a coupler for you to check out that shows how it installs and where.

The manual lockout on your Atwood 85778 surge brake coupler is there so that you can back up the trailer without the brakes locking up on you. Yes you can safely tow your trailer with the broken manual lockout, you just have to make sure you…

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.