From: Squirt_Truck (squirt_truck@yahoo.com)
Date: Mon Aug 08 2005 - 14:46:07 PDT
Well said on the hazards of winch cables.
Wire rope under load can and will kill.
The winch on the 5-tons (front mounted) are #20,000 (cap.) on the first
lay of the drum and have 5/8" wire rope. The wreckers have 280' that
fills the spool and all others have 200'(one less lay less on the
spool)
Someone on the list here has a test report from a company that tested
small winch cables, the results were not comforting.
Use the shear pins, then you will not have failed rope to worry about,
BUT do spool off and inspect on a regular basis if you use it.
Squirt Truck
--- david gudmunsen <kroctec@btopenworld.com> wrote:
> Hi Kenny,
>
> I am always very concerned when the subject of cables comes up. My
> father
> was aboard a ship where a cable parted and one of the crew killed and
> another very seriously injured. Every year there are horrendous so
> called
> accidents involving winching/lifting operations that have gone badly
> wrong.
> I also have personal experience of seeing cables part and fixings
> fail. The
> kinetic energy release is huge and very scarey.
>
> Firstly cable strength is determined by not only the combined cross
> sectional area of the wires in the cable but also by the tensile
> strength of
> the material (hugely variable and not ascertainable without testing).
> There
> are also many factors that can seriously reduce the safe operating
> load of
> any rig and don't forget that the whole is only as strong as the
> weakest
> part.
>
> Remember that there is a legal duty of care with regard to the safety
> of
> other persons and you need to cover your ass.
>
> This said any cables should have a current inspection safety
> certificate. A
> further point is that shear pins are placed to ensure that overload
> does not
> occur so these should be to a precise specification having also a
> certification and it is wise to colour code them so that there can be
> no
> chance of fitting the incorrect shear pin.
>
> Depending on how you rig the operation a 10000 lbs winch has the
> capacity to
> tear either vehicle to pieces.
>
> My final advice is to go, with your cables, to a crane winch cable
> supplier
> and get them to do appropriate tests and issue you with a certificate
> and
> also correct shear pins. Cables should also be periodically retested
> (annually) or if you see any signs of damage when the cable should be
> regraded and possibly broken down so the damage is no longer in the
> system.
>
> Best regards from David Gudmunsen
>
> Feel free if you want to get back to me on any points.
>
> on 8/8/05 13:43, Recovry4x4@aol.com at Recovry4x4@aol.com wrote:
>
> > Gang, just how strong is 1/2" winch cable? Reason I'm asking is my
> M756A2
> > has the conventional 10,000# capacity deuce winch on the front
> that carries
> > 200' of 1/2" cable. (Had to add the word capacity becuase some
> moron would
> > tell
> > me my front tires are overloaded). The truck also has a 20,000#
> capacity
> > winch on the back. It's nearly identical to the winches mounted on
> the front
> > of
> > 5 tons. The manual calls for 300' of 1/2" cable for this winch
> also. Should I
> > be concerned about putting the same size cable on both winches
> considering
> > the fact that this one is rated a twice the capacity? I do plan on
> working
> > the
> > winch too!
> > Just a thought and question!
> > Kenny
> >
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