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Originally Posted by motto
If only it were that simple Tony but unfortunately it isn't.
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David, I don't profess to understand the load rating system completely, but I do find the load rating parameters perfectly simple and logical. They are FUNCTIONAL FEATURES relating DIRECTLY to load carrying capability. That includes gradeability and braking ability. Hence 30cwt truck uprated to 3-ton by fitting 2-speed diff and brake booster.
The real confusion arises when we attempt to correlate load ratings with parts and components, because these are ever changing. As I've tried to point out before, components do not determine load rating. They merely determine vehicle reliability. Components found wanting in service can be upgraded, both in production and in the field. This does not change the nominal load rating. Classic example is 3-ton Ford CMP steering box, upgraded TWICE before they got it right!
Quote:
Originally Posted by motto
The North Americans seem to have used piston type boosters on their trucks which is what I would expect to see if original equipment.
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Yes I believe you're right David. Here's the Dodge 3-ton set up:
