Muladzh Posted June 3, 2010 Share Posted June 3, 2010 The Pyro gauge on my truck is not functional, what is likely to be the problem and how can I fix it? I am capable of doing things, just don't know much. Also, how does the fancy chrome and leather Mack steering wheel come off - the steering wheel points right when going straight, I want to fix that but can't see how the shiny horn button comes off to get at the bolt. I don't want to attack it wrongly and spoil it. That's it for things stumping me so far... Probably have tons of other questions soon. Quote Link to comment https://www.bigmacktrucks.com/topic/14188-79-mack-rs600l-pyro-gauge/ Share on other sites More sharing options...
Rob Posted June 4, 2010 Share Posted June 4, 2010 The Pyro gauge on my truck is not functional, what is likely to be the problem and how can I fix it? I am capable of doing things, just don't know much. Also, how does the fancy chrome and leather Mack steering wheel come off - the steering wheel points right when going straight, I want to fix that but can't see how the shiny horn button comes off to get at the bolt. I don't want to attack it wrongly and spoil it. That's it for things stumping me so far... Probably have tons of other questions soon. The pyrometer can only be one of two things. Either the thermocouple and wire, (screwed into exhaust near turbocharger) or the gauge in the dash has gone bad. Most likely the thermocouple. Just get a new one, install it and good to go. It will only have two wires, one is red, the other yellow. Pay attention to how they are mounted to the gauge and reconnect the same way. These generate a small DC voltage to drive the meter movement and require no external power source other than for a backlight. They are known as a "Type K" thermocouple due to the temperature spectrum they are designed to operate within.The steering wheel typically comes off with the horn button twisting about 90 degrees to the left. Most you need to depress the horn button so I disconnect the batteries so as to not listen to the horn blow. You will then need to pull the nut on the steering shaft, install a puller and pull it free of the tapered shaft.I would probably have the alignment checked on the truck first however. Those wheels don't slip on the splines. Some are keyed, some are not so it is a possibility it was never installed with the proper orientation. Most times a non centered steering wheel is by incorrect setting of the toe alignment. This is the last adjustment in any front end alignment. If you've never had the service performed, it is worth the money for a thrust alignment to ensure all tracks as it should. Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/14188-79-mack-rs600l-pyro-gauge/#findComment-56481 Share on other sites More sharing options...
Muladzh Posted June 6, 2010 Author Share Posted June 6, 2010 Thank you for the reply, I will get an alignment, and go from there. I will also get the thermocouple and fix that. Quote Link to comment https://www.bigmacktrucks.com/topic/14188-79-mack-rs600l-pyro-gauge/#findComment-56603 Share on other sites More sharing options...
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