Deuce winch info thread.

[m16ty]

While researching the possibility of changing my deuce winch over to hyd, I realized a bunch of info is here for the winch but it's scattered all over the place and buried inside threads.

I'm going to attempt to gather all the info I can find and put it here so people can find it.

It's a work in progress and the thread is going to remain closed to keep discussion out. If you have info that needs to be added, please send me a PM.


TMs

http://www.steelsoldiers.com/showthread.php?99463-TM-9-3830-206-34P-Winch-Parts-with-exploded-views
http://www.steelsoldiers.com/attachment.php?attachmentid=487100&d=1396967325
http://www.steelsoldiers.com/attachment.php?attachmentid=487103&d=1396967767

 

[m16ty]

Deuce winch shear pins

The stock Mil-spec deuce shear pins are 9/32" in diameter and made out of 2024 aluminum. It is a fairly good consensus here that the heat treat number is T361 but that hasn't been confirmed through testing or military publication.

There has also been some instances where some of the well known vendors are selling incorrect pins. The original Mil-spec pins will not have a head, have cotter pin holes on each end, and they will be made of aluminum.

Do not use a steel bolt or any other steel shear pin. Many people have destroyed their winch using a steel bolt in the place of a factory AL pin and there have even been instances where the PTO was ripped right off the side of the transmission.

The pic is a spreadsheet of shear pin testing that was done by gringeltaube . It shows his testing of the shear strength of different materials and different diameters.

 

[m16ty]

Deuce winch technical data

Following may help to calculate, or better say estimate HP needed to operate our winches at rated power (and over), using the popular formula:
HP = torque x rpm / 5252


Winch facts:

• PTO low range for the Spicer 3053 is 650rpm @ 1000 engine rpm; equals 520rpm at 800rpm (engine idle)
• 520rpm, propeller shaft => 22.6rpm, drum (23:1 ratio)
• Bare drum diameter is 5.0”, so 1 drum revolution takes 1.5ft rope (first layer)

Winch is rated 10,000lbs @ 15ft/min, bare drum), so:

• 10,000lbs on bare drum => 2333 ft.lb torque needed on drum shaft
• 22.6 rpm => 34ft/min, so 15 ft/min => 10 drum rpm

2333 x 10 / 5252 = 4.5HP, as rated.


Now, all losses included, the estimated efficiency for a typical worm gear reduction is not more than 60%. So we actually need more like7.5HP at rated speed, but prob. up to 17 HP at actual speed, in LOW.....!?

Interestingly, with the original shear pin resisting around 300ft.lb, a winch operating at the real “limit” and only 15ft/min would then draw 13 HP from the PTO, which is +/- what the book shows... (What they didn't tell is how to achieve that low pull-in speed)..... (Above info provided by gringeltaube )