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How does a Hourmeter work?

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Marcus

03-02-2003 15:08:11




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I recently had to replace the "Proofmeter" on my IH 2424. As with most tractors, it includes the tachometer and Hourmeter in one unit. Until now, I had always thought that there was some sort of electrical connection for the hourmeter to measure the time the engine was on. Instead, all there was is a single mechanical connection for the tachometer cable. This got me thinking that the hourmeter doesn't measure actual time. The hourmeter must move faster when I'm at full throttle, and much slower when I'm at idle.

Can anybody explain or confirm?

Thanks,

Marcus.

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Mike (WA)

03-03-2003 08:29:30




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 Re: How does a Hourmeter work? in reply to Marcus, 03-02-2003 15:08:11  
When I was in high school in early '60's, my dad and I moved a house onto a corner of the farm. Had to dig a septic system, pit down for a well, etc. Rented a backhoe, and only ran it about half speed because the hydraulic pump was so fast at "combat" speed that I couldn't control it. The hour meter thus only ran a half hour per "real" hour- dad was determined to get his 8 hours worth, and kept asking me "Are we done yet?" "No- XX more hours". We ran it til total darkness, and ended up doing every digging project we could conceive of, for years to come.

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Bob

03-02-2003 16:32:56




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 Re: How does a Hourmeter work? in reply to Marcus, 03-02-2003 15:08:11  
On this type of hourmeter, the hours registered are directly porportional to engine speed. Generally, they will read true hours at RATED ENGINE SPEED.

If you think about it, this probably gives a more true indication of wear on the engine, or oil change interval, because, most likely when the engine is slowed down, it is not working as hard.



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Dr.Evil

03-04-2003 12:23:10




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 Re: Re: How does a Hourmeter work? in reply to Bob, 03-02-2003 16:32:56  
RIGHT You are BOB. On a semi-truck Dad used to drive years ago there was an hour meter in the tach that said RPM X 100,000. So they (GMC) considered an engine hour to be 100,000 revolutions of the crankshaft. Let's put it this way.... That crank had been around a LOT. Anything that runs about 1650 RPM (H Farmall) It figures out real close.



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jim

03-02-2003 15:33:37




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 Re: How does a Hourmeter work? in reply to Marcus, 03-02-2003 15:08:11  
If you check your owner's manual, I think you'll find that the hours indicated are those hours at,or above , a certain RPM , usually those rpms that produce the standard PTO speed. RPM's below standard pto speed accumulate hours more slowly.



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Neil H Boyd

03-02-2003 15:18:55




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 Re: How does a Hourmeter work? in reply to Marcus, 03-02-2003 15:08:11  
hourmeters work any time there is a electical flow though it.



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Farmered

03-02-2003 17:51:11




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 Re: Re: How does a Hourmeter work? in reply to Neil H Boyd, 03-02-2003 15:18:55  
Neil, There are two types of hour meter. One gives you an approximate time based on the engine being operated at rated RPM. It is a mechanical drive and there is no electrical connection. Bob has explained this one very well.
The other type is an electric clock which runs when energized. It may be controlled by the ignition switch (gas) or triggered by an oil prressure switch (diesel). This type measures elapsed time without regard to engine speed. Ed

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Marcus

03-02-2003 15:53:52




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 Re: Re: How does a Hourmeter work? in reply to Neil H Boyd, 03-02-2003 15:18:55  
I agree. There isn't any electrical connection, however.

Marcus



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Brian G. NY

03-03-2003 05:45:21




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 Re: Re: Re: How does a Hourmeter work? in reply to Marcus, 03-02-2003 15:53:52  
As Farmered says, the simple (and cheap) hourmeters are simply electric clocks that measure time when the engine is running. I bought one of these for My old Allis WD so I could keep a better handle on when to change the oil and filter.



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