Date registered: Nov 2004
Vehicle: '88 U-1300L, '70 406, '78 406, '78 416 project, '82 406, '57 404, '65 404, '70 404, '68 Haflinger.
Location: Greenback, TN
Mentioned: 2 Post(s)
Quoted: 49 Post(s)
My U-1300L's Werner winch seems to be set up similar to yours, with some important exceptions. The EIN/AUS switch on the dash turns on/off a pneumatic control on the winch so that when it's EIN, the coupling engages and the hydraulic motor drives the winch gearing (hydraulically going in or out). AUS disconnects the coupler, and if (and only if) there is no load on the winch, the coupling disengages and the cable can be pulled off the drum. Neither of those operations does anything to the tensioner up near the front (under the driver, a totally passive device (the tensioner, not the driver LOL)), nor to the brakes (on my truck). You might find there really is no control of the tensioner up front. It's simply a set of rollers with friction, that drags the cable on the inward direction. When well lubricated, the tensioner works great. Easy to pull cable out by hand, and the winch pulls cable in.
I'd bet the engagement of your brakes is an option, and can undoubtedly be defeated. The air pressure supplied in EIN position probably applies the brakes (probably your front brakes) in addition to engaging the winch drive.
Because the rear parking brakes require the RELEASE of air pressure, you would certainly hear that air dump if the rear brakes lock when EIN is engaged. You didn't mention it, and that air dump is so obvious, I'm going to suggest your rear brakes do not lock, but your front ones do. An easy test.
My front brakes will lock also, but that requires that I push another button on the dash, and I believe that applies air pressure to some part of the hydraulic brakes to lock the front brakes. Probably your truck has the EIN button provide that front brake lock air pressure instead of the separate switch like on my truck.
All that said, if you confirm that only your front brakes lock in EIN position, then you simply need to find the air line between the winch disconnect assembly (operated by EIN/AUS), and the front brakes, and disable it. You'd have the option of adding a valve to provide front brake locking independently of the winch EIN operation. But, be sure the front brakes cannot be engaged unless the rear parking brakes are also engaged, as a safety, like mine is. Imagine the problem if the front brakes were locked up while in motion.
BTW, the winch has a drag brake adjusted by a large hand knob (right side from the rear). That drag should be tight enough that the cable does not unwind from vibration. The manual says the EIN/AUS should be left in the EIN position (red light off) but I leave it AUS as a safety measure against accidental winch engagement.