NoSlack II 5th Wheel handle not locking open

look for a broken or missing spring under the front of the plate. Look at another 5th wheel.

 

Do the jaws sometimes stay open, and the arm stay out? I'd first replace all the springs and see how it works then. I have the same problem that just came on, but it only happens when it's cold. 50°>, no problems. I've got a new spring kit and going to replace myself here in the next few days. I don't drop and hook. But it sucks at Walmart because they require drivers to disconnect during unloading.

 

I would start with spraying WD-40 or PB Blaster underneath around all the pivot points and linkages. When opened one of the linkages is supposed to "fall" and keep the handle extended until closed. If there is a bunch of grease built up it could prevent that from happening.

 

Vise grips

 

Had the same problem I started using low temp grease it works a little better

 

When I had that problem, it was a broken spring.

 

I'm sure a combination of an old, week spring and the 5th wheel lube I use during the warmer months was the problem in my truck. I use Shaeffer's 5th wheel spray lube, and it's known for being problematic in cold temps.