Quote:
Originally Posted by Tony Wheeler
It's worth noting that design factors such as auxiliary springs, diff ratios, steering boxes, big balls v. small balls etc. do not define load rating - they simply reflect the way a particular manufacturer designs their range of 8, 15, 30, or 60 cwt. vehicles, as defined above. Which means the whole question of load rating is far simpler than it appears - once you figure out the rules!
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Tony,
I'm afraid this is not entirely correct. The British War Office classification was a load classification, regardless of the technical configuration of the vehicles supplied by manufacturers.
Load carrier trucks have a load rating, tractors do not - see the thread
Is the FAT a 60cwt or 15cwt truck?.
To be able to carry the load and move it at convoy speed across country, manufacturers configured their trucks from existing components. As stated above, I sorted out the difference for Chevs recently, see
Chev CMP chassis views. One can see clearly that the heavier the load rating, the heavier the truck's components are - so "
design factors such as auxiliary springs, diff ratios, steering boxes, big balls v. small balls etc."
in fact do define load rating!
Quote:
Originally Posted by Hanno Spoelstra
C30:- Front axle with 5” steering ends
- Brakes, front drum: 14” diameter, 2” width lining
- Brakes, rear drum: 15” diameter, 3.5” width lining
- Wheel size: 16” rims
- Differential gear ratio: 7.16 to 1
- Rear spring leaves: 12
C60S:- Front axle with 6” steering ends
- Brakes, front drum: 15” diameter, 3.5” width lining
- Brakes, rear drum: 15” diameter, 3.5” width lining
- Booster actuated brakes
- Wheel size: 20” rims
- Differential gear ratio: 7.16 to 1
- Number of rear spring leaves: 12 + 6 Aux.
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Quote:
Originally Posted by Tony Wheeler
On the question of LWB with 16" wheels, eg. F602L pictured above, I suspect these are rated for on-road use only, just like MCP vehicles. As such it would equate with the Dodge T110L5 (160" wheelbase, 16" wheels, 2-spd diff) which is rated 3-ton.
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The F602L has a 3-ton load rating, as has the Dodge, the fact that they had 16" wheels has noting to do with their load rating. They were fitted with 10.50-16 tyres to bear the load.
As per Vanderveen: "Truck, 3-ton, 4x2, GS (Ford F602L) V-8-cyl., 95 bhp, 4F1R, wb 158-1/4 in, 243x90x118(78) in., 7280 lb. Latest type, using many components of F60L. Tubular front axle, two-speed rear axle. Also with four-stretcher ambulance body and 134-1/4 in. wb GS with open cab."
HTH,
Hanno