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Hour meter

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Gerald R.

08-15-2002 19:16:19




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On the 50s tractors (and others) the hour meter is mounted on the face of the tach. My question is does the last numerical space on the right designate tenths or whole hours? There is another space on the far right of the guage which has no numbers but instead is alternating black and white. Is this the one that designates tenths? My tractor has either 3500 hrs, in which case the meter must not have worked for a long time or 35000 hrs. If the latter is the case, no wonder everything is worn out!

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G-MAN

08-16-2002 07:35:08




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 Re: hour meter in reply to Gerald R., 08-15-2002 19:16:19  
Gerald, Steve has a good grasp on the speed-hour meter. The hours that are indicated are hours at rated speed, if I remember correctly. There should be a line on the tach face indicating PTO rpm, and that rpm is where the tach will indicate true hours of operation, at least on the newer tractors. When you're dealing with a tractor that only has 400 or 500 rpm difference between high idle and low idle, there's not going to be a huge discrepancy between time of operation. Unless the tractor is a one-owner that took good records, it's almost impossible to know actual hours on any tractor with a mechanical hour meter, as it could have been replaced, the cable could have been broken for 3 months back in '62, etc. And there's also the off chance that a previous owner was a bit of a crook and unhooked it to keep the hours down - you just never know.

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Steve - IN

08-15-2002 20:23:23




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 Re: hour meter in reply to Gerald R., 08-15-2002 19:16:19  
The white/black thing twirling around shows tenths, of a sort, based on average RPM. Remember, there's no clock in there, the thing is driven by a cable from the engine. It's geared to approximate time at an assumed average engine RPM. Run higher RPM and time speeds up. Run fewer RPM's and time slows down. Einstein would have loved it.

35,000 hours is nearly 4 years of continuous 24/7 work at average RPM, or 8 years of running 24/7 at half avg. RPM. Maybe 2 years at red line. Not likely. A tractor can sit out a lot and get to looking fairly ratty. My guess is 3500 is probably closer to the truth than 35,000.

Tractors now have real quartz oscillator clocks, or at least uP reference crystals which "accurately" record time the way your computer does: give or take 3 minutes a day or so. Great until a power spike blows, or zero power dumps the CMOS or the EEPROM --or the LCD itself cracks or the LCD driver dies. Ain't progress wonderful?

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