hours

[whitetiger]

Wt.. having a digital display ( led/lcd ) and an analog countiong meter is not new. I have heavy equipment parked outside with digital dash clusters, yet they still count pto hours.

Digital -display- and digital clock ( vs analog clock ) are 2 seperate items.

You could have a digital clock and an analog numeric display.. or an analog clock with analog display, or a digital clock with digital display. In short.. the display does not automatically dictate the clock metering method.

I can hit radioshack and pick up a handfull of parts and make a display that uses 2 multi segment led's, and a trip switch and a display driver circuit and a simple counting circuit. Each trip of the switch add's +1. You could put this on a bicycle and mount on a rear wheel support and put a business card in the spokes to trip switch on every wheel rotation.

No matter how long that bike 'sets' there.. the digital display won't change numbers, until that wheel starts spinning. See where this is going?

( display type does not denote clock metering method )

Similarly, it would be quite easy to make a digital display circuit that accepted trigger input from a counting circuit, and the counting circuit was reading some engine reference like a timing pulse, or crank or other gear or shaft rotation, doing the math to equate pto rotation, and then triggering when 'x' rotations were met to signify a pto rotation, then sending that info to the digital clock display.. as pto rotations were counted and added, the display would increment.. etc... ( now add in other circuitry for memory, and etc.. and you may well get what some tractors and other equipment are using..

Soundguy

I am well aware that there is a great difference in how things are done in heavy industrial equipment. I have a very good friend that has serviced it for over 25 years and we do compair notes.
I think the question was about a small tractor. In the last couple days as I have been running different tractors I have watched the hour meters and on a TN75DA with digital dash it keep time the same as a TV145 and a TG 215. Every 6 minutes it adds 1/10 at approx 1200 ERPM. I personal have never seen an ag unit with a non cable drive tack that has anything different than a 60 min = 1 hour hourmeter. None of the models I checked added hours with out the engine running.
Combines have two hour meters, one for engine run time just like a tractor and one for threasher hours which only runs with machine seperator engaged.

 

[Doc_Bob]

I think the question was about a small tractor. In the last couple days as I have been running different tractors I have watched the hour meters and on a TN75DA with digital dash it keep time the same as a TV145 and a TG 215. Every 6 minutes it adds 1/10 at approx 1200 ERPM. I personal have never seen an ag unit with a non cable drive tack that has anything different than a 60 min = 1 hour hourmeter. .

My TN70A is a wee bit different. If my ERPM is less than 2200 rpm, I get less time on my hour meter than my engine time. I only noticed this one day when I was using my hour meter as my watch. My wife came out and wanted to know why I was late. I looked at said it had been only 2 hours. It had been more like 3 hours. That is when I started paying attention. When I run at 2200 rpm when doing bush hogging, I get hour for hour. When I run around at 1300 RPM carrying light loads of wood chips, my hour meter gives me less time on the clock than my actual run time. Many times when doing light work, I can drop down to 700 rpm then back up to 1200 or 1100 or 1300 ERPM. So, every our on the meter is really much longer in real time.

I will take another look. You have got my interest on this issue.
Bob

 

[Soundguy]

It's not just heavy equipment.. or industrial.. it's however the manufacture set up that equipment line.

My 'ag' tractor.. does not have a cable drive tach.. rather electric pulses are picked up off the alternator.. and thus hours are added at pto rpm based clock metering.. not real time based metering.. I.E. I rack up less hours while idline and greasing and refueling vs mowing or traveling down the road.

It's not a white/black cut/dry issue.. it falls down to how each piece of equipment is setup.. As i stated before... the display type does not dictate the metering method.

Soundguy

I am well aware that there is a great difference in how things are done in heavy industrial equipment. I have a very good friend that has serviced it for over 25 years and we do compair notes.
I think the question was about a small tractor. In the last couple days as I have been running different tractors I have watched the hour meters and on a TN75DA with digital dash it keep time the same as a TV145 and a TG 215. Every 6 minutes it adds 1/10 at approx 1200 ERPM. I personal have never seen an ag unit with a non cable drive tack that has anything different than a 60 min = 1 hour hourmeter. None of the models I checked added hours with out the engine running.
Combines have two hour meters, one for engine run time just like a tractor and one for threasher hours which only runs with machine seperator engaged.

 

[NewToy]

My TN70A is a wee bit different. If my ERPM is less than 2200 rpm, I get less time on my hour meter than my engine time. I only noticed this one day when I was using my hour meter as my watch. My wife came out and wanted to know why I was late. I looked at said it had been only 2 hours. It had been more like 3 hours. That is when I started paying attention. When I run at 2200 rpm when doing bush hogging, I get hour for hour. When I run around at 1300 RPM carrying light loads of wood chips, my hour meter gives me less time on the clock than my actual run time. Many times when doing light work, I can drop down to 700 rpm then back up to 1200 or 1100 or 1300 ERPM. So, every our on the meter is really much longer in real time.

I will take another look. You have got my interest on this issue.
Bob

Is your hourmeter a digital or analog type?

John

 

[Doc_Bob]

Is your hourmeter a digital or analog type?

John

I assume you mean digital with digital readout? Then no. Mine is a nice analog gauge. Is that what you mean?
Bob

 

[NewToy]

I assume you mean digital with digital readout? Then no. Mine is a nice analog gauge. Is that what you mean?
Bob

That's exactly what I was trying to say. From what I gather the digital type count straight clock time regardless of what the RPM's are and the analog variety vary according to RPM's.
John

 

[Jay4200]

NOT to bump heads with anyone here at all but all the hour meters I am familiar with work off the electrical switch or oil pressure. No RPM thing at all.

My Kubota L4200 hour meter is a tach meter.
It reads in HOURS*RPM/(PTO RPM)

Jay

 

[Soundguy]

That's exactly what I was trying to say. From what I gather the digital type count straight clock time regardless of what the RPM's are and the analog variety vary according to RPM's.
John

Again.. display type does not automatically denote metering method. i have plenty of heavy equipment that rack up tach hours but have a digital LED dash display.

What you need to know id the metering method.. not the display method.

Soundguy

 

[NewToy]

Again.. display type does not automatically denote metering method. i have plenty of heavy equipment that rack up tach hours but have a digital LED dash display.

What you need to know id the metering method.. not the display method.

Soundguy

I was taliking about tractors and not heavy equipment. Can you site an example of a digital hourmeter on any brand CUT that registers anything other than straight clock hours? I would think it to be a pretty sophisticated gadget to factor RPM's in it's time keeping duties.
John

 

[dgl24087]

It doesn't have to be sophisticated at all, a tach cable running to the hour meter which records the rpms, it would be preprogrammed to equate rpms to hours.