hour meter and 3-pt

[Doc_Bob]

My NH TN70A (Ag tractor) records one hour for hour only when running at 540 RPM PTO speed. 2200 engine rpm = 540 pto rpm or one hour on meter. 1100 engine rpm = 2 hours on meter.
Bob

 

[19977]

I have a 4520 JD and if i have my 3ph w/MX6 on raised all the way up, sitting still ,motor running at idle,it will periodically cycle.No leaking cylinder,i've had this tractor new 2005,w/absolutely no problems w/ hyd.system.A problem, imho thats just the way it suppose to work.
Mike

 

[dfkrug]

DF,

Doesn't always have anything to do with LCD or analog. My 2005 case DX33 has an analog meter. Here's the wording straight from the manual

"Proof Meter - records the hours and portions of hours that your tractor has been operated regardless of engine RPM"

I would suggest it has more to do with your specific tractor and brand than what type of display you have.

jk

Certainly a tractor could use a simple electric clock to work as a
"proof meter" and have an analog display. I have some of those
add-on hour meters. I have never seen a mechanical clock with
an electronic (LCD or LED) display. Engine-driven mechanical "hour
meters" use a cable and gears to turn a numerical analog
display, resulting in true hours only at the rated RPM. It is
possible to use such a cable, connected to a digital counter
that would yield a similar output on an electronic display. I doubt
this is done, however. So I stick by my story. If anyone knows
first hand of a diesel engine with a drive cable and digital electronic
"hour" meter, please tell.

BTW, most cars have gone to electronic tachometers, since it is
cheaper and more reliable to use the ignition signal and a digital
counter than an analog meter and cable. Diesels are harder cuz
there is no ignition signal, of course, so a flywheel position sensor
is needed.

 

[DavesTractor]

Some electronic tachs take a signal off the alternator.

 

[Soundguy]

Dave beat me to it.. but yeah.. my NH 7610s has a mechanical tach/hour meter that uses electric pulses from the alternator.

Also.. the Chalanger 200 series and maybee the 300 series have a digital LED display tach optional dash, and it shows rpm-hours.

I verified this with our CAT dealer about 3 weeks ago in reference to another post where someone said they had never seen a digital display that used rpm-hours.. and instead said that digital dashes would only display clock hours.

Same as i told him.. display type does not dictate hour accumulation method. As has been shown here.. it'[s simple to have an analog meter that uses both clock or rpm hours, and you can have a digital that will show either.. all depends on the pickup and the driving circuitry... I.E. a cable or a handfull of components from an electric supply store.

Soundguy

So I stick by my story. If anyone knows
first hand of a diesel engine with a drive cable and digital electronic
"hour" meter, please tell.

BTW, most cars have gone to electronic tachometers, since it is
cheaper and more reliable to use the ignition signal and a digital
counter than an analog meter and cable. Diesels are harder cuz
there is no ignition signal, of course, so a flywheel position sensor
is needed.

 

[dfkrug]

Some electronic tachs take a signal off the alternator.

Off the alternator. How interesting! I have not seen one of those (yet).

I am not sure what I prefer....real hours or an RPM-based counter....

 

[john_bud]

They used to be off the generator.

jb

 

[Soundguy]

I've got an old lucas genny with a tach drive... A very spendy unit to repalce i might add. In most cases.. the mechanical tach drive operates alot longer than the lucas electronics! ( Lucas: Prince of Darkness! )

Soundguy

 

[daTeacha]

Yeah, but those Lucas electrics are what makes old British cars so much fun to own and operate. Every trip is a potential adventure waiting to happen! I used to run a '65 TR4A without IRS. You just were never absolutely sure you'd be able to get home without having to fix something.

 

[Soundguy]

I think I remember a few comments about Lucas.. most of them i can't repeat here.. but many of them involve walking home pushing your motorcycle.. or driving home with headlamps that were orange.

And then there was the one that said" if lucas made wars.. they wouldn't start either! "

Soundguy