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| recovery safety advice http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=39233 |
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| Author: | scoobysnax [ Thu Jan 15, 2009 7:40 pm ] |
| Post subject: | recovery safety advice |
I have some questions about recovery safety gear and I know there will be many answers so lets hear them. Here's what I have: Mopar front tow hooks rated at 5,000 lbs each Class IV Draw-Tite receiver hitch rated at 7,500 lbs and 750 lb tongue weight Reese D-ring hitch shackle rated at 10,000 lbs 2” 30’ recover strap (Expeditionware) rated at 7,000 lb working load and 20,000 lb breaking strength A good friend of mine recently got an old Land Rover D90 that has an 11,000 lb winch on the front bumper. The liberty weights 4,100 but I have no idea how much stress is on a which cable when it’s pulling the Liberty out of mud. 2,000? 10,000? 20,000? I have no idea, I know that the mud suction on a framed truck can be pretty strong. If the front tow hooks broke how would they break? Would the bolts holding them snap? Would the hook snap or just bend open? I would like to know if I need to seriously worry about the winch line coming back to the recovery vehicle alone or with a 10 lb tow hook on the end of it. Regarding the rear, what would give out first? I’m assuming the receiver itself can handle more than 7,500 lbs but maybe I’m wrong. Am I at risk of bending the rear of my frame? Do you think there would be any clues? Will I hear the receiver make a noise first or will it just go with no warning? Is it a bad idea to use an 11,000 lb winch on a 5,000 lb tow hook or, 7,500 receiver? How much weight should you have on in the middle of a winch cable or tow strap to really have an effect? Is a towel enough or do you really need 10 or 20lbs on it? |
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| Author: | jsc7002 [ Thu Jan 15, 2009 7:45 pm ] |
| Post subject: | |
I would be really surprised if you break a tow hook or hitch, what they are rated for is 1/3 of their breaking strength, and like that tow strap that has the breaking strength of 20,000 lbs, I dont think you will be breaking it unless it is frayed or cut or you are just doing something that you shouldnt be doing. But I think it would pretty much always vary from the welds to the bolt and how the recovery device is being used. |
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| Author: | jamangus [ Thu Jan 15, 2009 7:55 pm ] |
| Post subject: | Re: recovery safety advice |
scoobysnax wrote: If the front tow hooks broke how would they break? Would the bolts holding them snap? Would the hook snap or just bend open?
The problem with the oem front hooks is theyre not mounted well. You will never break the hook or the bolts before they simply rip through the sheet metal of your unibody. |
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| Author: | tjkj2002 [ Thu Jan 15, 2009 7:59 pm ] |
| Post subject: | |
I've seen the OEM KJ front tow hooks bend themselfs and also seen the mounting area bend as well from the stress.With a hitch mounted reciever(hook or shackle) you are putting all your faith on one 5/8" thick lock pin. |
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| Author: | jsc7002 [ Thu Jan 15, 2009 8:03 pm ] |
| Post subject: | |
tjkj2002 wrote: I've seen the OEM KJ front tow hooks bend themselfs and also seen the mounting area bend as well from the stress.With a hitch mounted reciever(hook or shackle) you are putting all your faith on one 5/8" thick lock pin.
yes but you also put all of that weight on that same pin when you tow, so I dont see much difference there. |
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| Author: | tjkj2002 [ Thu Jan 15, 2009 8:06 pm ] |
| Post subject: | |
jsc7002 wrote: tjkj2002 wrote: I've seen the OEM KJ front tow hooks bend themselfs and also seen the mounting area bend as well from the stress.With a hitch mounted reciever(hook or shackle) you are putting all your faith on one 5/8" thick lock pin. yes but you also put all of that weight on that same pin when you tow, so I dont see much difference there.  .
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| Author: | jsc7002 [ Thu Jan 15, 2009 8:09 pm ] |
| Post subject: | |
tjkj2002 wrote: jsc7002 wrote: tjkj2002 wrote: I've seen the OEM KJ front tow hooks bend themselfs and also seen the mounting area bend as well from the stress.With a hitch mounted reciever(hook or shackle) you are putting all your faith on one 5/8" thick lock pin. yes but you also put all of that weight on that same pin when you tow, so I dont see much difference there. .true but those hitch pins should be able to handle that fine, those are the same hitch pics that are used when you tow with any vehicle, so a 1 ton diesel towing a 25ft tandem loaded down to the trucks max capacity would be the same amount of weight and you see that all the time going down the road |
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| Author: | jamangus [ Fri Jan 16, 2009 9:35 am ] |
| Post subject: | |
yup, even a cheap 5/8 pin shears at 30,000 pounds. (And fit properly, it's a double shear.) You'll do a whole lot of damage to the little KJ before you bust a pin. |
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| Author: | Guest [ Fri Jan 16, 2009 10:14 pm ] |
| Post subject: | |
You could hook the strap onto both hooks that way the load is divided. |
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| Author: | durangotang [ Fri Jan 16, 2009 11:50 pm ] |
| Post subject: | |
tjkj2002 wrote: jsc7002 wrote: tjkj2002 wrote: I've seen the OEM KJ front tow hooks bend themselfs and also seen the mounting area bend as well from the stress.With a hitch mounted reciever(hook or shackle) you are putting all your faith on one 5/8" thick lock pin. yes but you also put all of that weight on that same pin when you tow, so I dont see much difference there. .Just curious... you happen to have access to or know where someone could get a hold of those recovery charts with the mire factor calculations that they use in the army? I had one but it disappeared. |
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| Author: | RAYMAN975 [ Fri Jan 16, 2009 11:59 pm ] |
| Post subject: | |
icarl wrote: You could hook the strap onto both hooks that way the load is divided.
all depends on how you do it, one is your better bet. if you use a short stap going to both front kj hooks, and a longer main strap connected to that, its going to pull those front kj hooks "inward" on each other or even if its say a 30ft strap, the "V"c pointed end connected to the pull vehicle, and the 2 open ends conencted to both front kj hooks, its still at too much angle"in my opinion", only 15feet and would still want to pull inward on the hooks. id only use both hooks at the ssame time if the strap was really really long to take the angle out. if you can understand what im saying 
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| Author: | JeepinMaxx [ Sat Jan 17, 2009 12:58 am ] |
| Post subject: | |
Factory tow hooks in front - My wife had a tow strap zip tied to it and draped over the hood through the passenger side window for a mud hole at a Jeep Jamboree back in the day. After the trail run there was a 15 mile run on the highway back to the camp. She had to pull over after a loud 'bang' She ran over the tow strap with her front wheel at 65MPH... The 30,000 strap failed - and the factory tow hook moved 1/8 " IMOO - the factory set-up is fine
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| Author: | Guest [ Sat Jan 17, 2009 12:59 am ] |
| Post subject: | |
Interesting. Wonder why they put 2 hooks on the front then?
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