nicste Posted September 3, 2020 Share Posted September 3, 2020 Good Day Does anyone have any diagrams or schematics of the R model air system. We have an R797 that we are trying to restore to original, over the year the air system has become a mess. On that note any wiring diagrams would also be greatly appreciated 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/ Share on other sites More sharing options...
Swishy Posted September 3, 2020 Share Posted September 3, 2020 Here U go try this on fir size cya Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460054 Share on other sites More sharing options...
mrsmackpaul Posted September 3, 2020 Share Posted September 3, 2020 (edited) Something to remember is different parts of the world had different air brake requirements to Australia I dont think they will be a lot different but ? The UK and at a guess Europe as well had three air lines going to their trailers, not sure what the third air line did, have asked before but never had a good answer So some extra things to think about, Swishmans picture should be a good start Paul Edited September 3, 2020 by mrsmackpaul Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460056 Share on other sites More sharing options...
nicste Posted September 3, 2020 Author Share Posted September 3, 2020 That image is a good start, thanks. Our trucks came through Australia but only has two lines to the trailer. We have a trailer brake lever fitted and the truck brake on the steering column. I'm presuming those are doing the task of the system park and trailer park knobs of the never models. I don't know what the trailer control valve in the image is. Regards Nic Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460058 Share on other sites More sharing options...
RJ1 Posted September 3, 2020 Share Posted September 3, 2020 Here is an electrical diagram that may help. r_model_electrical_diagram.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460059 Share on other sites More sharing options...
JoeH Posted September 3, 2020 Share Posted September 3, 2020 Knobs are for operating the spring parking brake. The levers would operate either the trailer service brakes or the tractor service brakes (rear axles only, not steering). These levers are to help maintain control of the vehicle incase of emergency situations such as jack knifing. Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460061 Share on other sites More sharing options...
JoeH Posted September 3, 2020 Share Posted September 3, 2020 USA tractor I owned had 3 park brake knobs, one would supply are to the trailer, one worked tractor parking brake, third worked trailer parking brake. Quote Link to comment https://www.bigmacktrucks.com/topic/64005-r-model-air-system/#findComment-460062 Share on other sites More sharing options...
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