The frames of most CMP trailers, including the 4 wheeled ones, were made from standard rolled structural channel (C beams) rather than stamped sections like the truck frames. The drawbar should be an A frame with a lunette eye that is free to turn within friction blocks, operating the hydraulic brakes through a short lever arm. The master cylinder for all seems to be the Ford master cylinder. The lighter versions were simple impact brakes brakes while the heavier versions were boosted. There were two versions of the tuntable, the simpler one was two plates (with a grease fitting to ensure easier turning) while the heavier versions used a series of rollers arranged around the rim of the turntable. The roller turntables were clearly marked in the manuals "do not lubricate", presumably because the lubricated rollers would collect dirt and wear more quickly. I have seen one of each version, the plain plate was seized (slightly off straight so it was a beast to put on the trailer for recovery) while the roller version still turned nicely. Neither one had been moved for years before recovery.
Service manuals SB-13 and SB-31 apply, there is also mention of SB-37 but I don't have that to know what is different about it compared to the other two manuals. The manuals that I have are more or less confimed to the chassis, making almost no mention of the body attached. The manual for specialist trailers (brake drum grinding etc.) include the relevant chassis manual and the particular equipment mounted in the trailer but still virtually nothing about the body it's mounted in.
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06-07-10, 16:24
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