Well that's two conflicting answers
Well that's two conflicting answers that only deepens the mystery. First thanks to everybody for trying to find a definitive answer.
Keith you found the rating that I remembered, kind of interesting that it gives it in tons. Which leaves us with long tons 2240 lbs or short ton 2000 lbs both are used in manuals CMPs sometimes with no indication of which. So that would give us a capacity of 14.5 tons which could be 32,480 lbs or 29,000 lbs a significant variance. I suspect that this breaking strength of cable and I suspect the figure on the data plate Keith found of 7500 lbs is the working load lifting load.
The wide variance in these figures is why I asked the question in the first place, because as has been pointed out the winch system is only as strong as the weakest part. Which if and when it breaks release all the energy stored in unspooled cable which can be considerable.
Bob as to the suggestion of a electric winch, where would be the challenge in that besides as you will note in the picture I've mounted a hydraulic lifting arm on the truck already 500-1000 lbs capacity with a 1750 lbs Warn electric winch. This is very useful for loading engines, steel beams etc into the truck. (much better than my back)
Half the fun (justification) for having three trucks is using them, being a little older and wisher I hope using with out breaking or wearing a bit of winch gear.
For now I think I will go with the approach of improving all my load attachment gear, ie chains, load straps, scotch cables up to atleast 12,000 lbs to match the snatch block I have. The point raised by Grant and hrpearce about load chaining the truck down. I think I'll go with letting the holding power of the scotches and engine at high idle be the load limiters.
I'll keep you posted on what I find.
But it would really be interesting to find a real answers to the design capacity of CMP winches. Or is this another case of they designed as heavy as they could and hoped it would be strong enough to do the job in the field.
On last point the long chassis with winch doesn't use the flex joint found on the 101 wheelbase units. It has all normal drive shafts though they are a little lighter design than the regular drive shafts.
Pictures of winch work to follow.
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