Today were going to take a quick look at the Atwood Trailer Coupler for A-frame trailer tongues part number 80071. This coupler is made in the USA and has a 5,000 pound gross trailer weight capacity. Its designed to be used with 50 degree A-frame trailer frames. Its got the standard mounting holes for a jack with a large center hole for the jack body and three threaded holes for the bolt hardware. Its designed to work with two inch trailer balls. Real quick well go over one measurement and has an overall length of about 14 inches.
Now were going to show you how the latching mechanism works. Right now its in the closed position and theres a hole right here that you can use with a coupler lock to secure your coupler. Itll prevent the latch from coming open while you are pulling your trailer down the road and also help protect your trailer against theft while storing it. To operate the latch well pull up on the handle and pull the whole system back towards our trailer. It slides our locking collar up and over the ball socket and on the inside it slides our wedge back and out of the way so that we can get a ball in or out.
Well take a look underneath at what happens when we close it. Lift the latch up and push the whole system forward and the wedge moves forward securing around the back of the ball. We have with us a two inch ball so well show how the system works with an actual trailer ball. Pull up on the latch, slide it back. We can fit our ball into the socket and push the whole system forward.
The wedge comes down and locks around eh back side of our ball. Now the ball is captive and cant go anywhere but it does freely enough for the trailer to track smoothly behind the vehicle. Lift up our latch handle and slide the system back and our balls free. Now this is a weld on application. So when you go to mount it to your trailer youll just weld along the edges securing the coupler to the trailer frame.
Thats it for our quick look at the Atwood Trailer Coupler for A-frame trailer tongues part number 80071.
Today on This Old Boat Trailer we are going to rebuild the hydraulic actuator on here and we are going to be using part number 85841, the master cylinder itself, and then we are going to use a master cylinder replacement cap part number A87478, and the cable push rod replacement kit part number 85852, all from Atwood. The first thing we need to do is remove the old master cylinder itself. This is going to require taking off the cap which we have already done. We have disconnected the line back here already and then we can see our factory line, lets disconnect that and then we are just going to undo these four bolts right here. There is probably going to be some leftover brake fluid in there so it will be a good idea to wear some gloves or something. We are going to pull out the back and then underneath there is a little push rod you may want to pull away from it too to help knock it out. 01:09
Today on This Old Trailer we are going to install a brand new coupler using part number 2836AT from Master Lock. This is going to be a three inch wide coupler on it and in between here is going to be three inches wide and it is going to use a two inch ball. The first steps involved are to remove the old coupler. It has been on there for awhile. It is rusted so take a couple of wrenches to it and maybe we will get lucky and we will actually break the bolts and get it to come loose that way. This little stand right here got bent back, probably pinching the coupler, so we are going to take that one apart too. Obviously this is rusted in place so we are going to have to persuade it off. 00:59
Today we are going to show you how to replace a hydraulic coupler. In this case this one is damaged and is going to get replaced by a totally different model. First thing we are going to do is actually drain all the fluid from the master cylinder. And what we are actually going to do is open up one of the wheel cylinders and pump our fluid out and into a holding container. All right we will go to the wheel cylinder now and attach a rubber line to the bleeder valve and get our container ready. What we will do is take the cover off our bleeder valve here and we will go ahead and open it up. Okay, here we just take a rubber hose and just slide it on to the bleeder valve itself. All right and then we will just run the other half of the hose into an empty container here and start draining the fluid out of the master cylinder.