Hook n ladder 1 Posted July 16, 2007 Share Posted July 16, 2007 My tach bounces back and forth. Can anyone tell me why? I have a 98 CH613.Thanks,Rob Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/ Share on other sites More sharing options...
Rob Posted July 16, 2007 Share Posted July 16, 2007 My tach bounces back and forth. Can anyone tell me why? I have a 98 CH613.Thanks,RobIf your tachometer is cable operated, the drive cable is binding and letting go inside the jacket. Take the cable loose from the back of the tachometer, and use speedometer lubricant to take care of that problem.If the tachometer is electronic driven, and driven by the alternator windings, chances are that a diode is blown in the alternator. Have you noticed a degredation in battery charging performance at all?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/2662-tachometer-question/#findComment-12998 Share on other sites More sharing options...
Truck#1 Posted July 18, 2007 Share Posted July 18, 2007 If your tachometer is cable operated, the drive cable is binding and letting go inside the jacket. Take the cable loose from the back of the tachometer, and use speedometer lubricant to take care of that problem.If the tachometer is electronic driven, and driven by the alternator windings, chances are that a diode is blown in the alternator. Have you noticed a degredation in battery charging performance at all?RobNo, everything is charging up nice and strong. Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/#findComment-13019 Share on other sites More sharing options...
Maxville Truck Posted July 19, 2007 Share Posted July 19, 2007 being a 98 you should have a proximity sensor that counts the teeth on your ring gear to give a reading to your tachometer. most likely cause of your problem will be either poor connection to that sensor or the sensor is loose in the flywheel housing that it threads into. crawl under the truck find the approximate area in your bell housing where your ring gear is. then follow the circumference around until you find it. the sensor will be either about 7/8" or 3/4" in diameter, fully threaded with a jam nut , with either 2 or 4 wires comming out of it. check the connections, then grab the sensor and see if it is loose in the flywheel housing. if so loosen the jam nut and tighten it into the ring gear then back it of just enough so it does not touch the ring gear. then tighten the jam nut. GOOD Luck!!I will try and find a picture of one.... Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/#findComment-13032 Share on other sites More sharing options...
Maxville Truck Posted July 19, 2007 Share Posted July 19, 2007 heres a picture Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/#findComment-13033 Share on other sites More sharing options...
Truck#1 Posted July 26, 2007 Share Posted July 26, 2007 heres a pictureThanks for the help!!! Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/#findComment-13135 Share on other sites More sharing options...
benelwell Posted February 14, 2008 Share Posted February 14, 2008 (edited) is it just a close up and down when you first start the truck, or is it a broad up and down all the time?Whoa, that was way outdated, I'm sorry. Edited February 14, 2008 by Tractor Kid Quote Link to comment https://www.bigmacktrucks.com/topic/2662-tachometer-question/#findComment-17030 Share on other sites More sharing options...
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