Hour Meter Issue

[LD1]

As others said. Its an RPM compensating Tach.

MY PTO speed is 2400RPM. That is where 1hr running = 1 hr time.

In other words, (2400 x 60) means the engine has to make 144,000 revolutions to = 1 hr.

IF I run 2000 RPM, in 1 hr time that is only 120,000 revolutions. So it is only gonna register .83 hrs.

If I am idling at 600RPM for a full hour, thats only 36,000RPM, and thus would only register .25 hrs.

However, if I am running MAX (above PTO speed) of 2900RPM, in 1hr time it will spin 174,000 times and clock up 1.2 hrs

 

[macguyver13]

Does anyone know how you can find out which type of hour meter you have? Is it something you have to lookup, an easy check of some equipment, or more involved? Specifically, I'm wondering about my BX25.

 

[big bubba]

other than inquiring @ your dealer or calling central K, start your engine and let idle say 1000 rpm and start a stop watch & take a meter reading to the nearest .0 (believe meters read in 1/10 of hr.. after say 15 minutes of real clock time (or ideally longer), read the meter. if the recorded time is 1:1 with your stop watch, it's 12v (electric) if less than real time, it's pto based. or of course you can trace the cable/or wire to the engine connection. if you have a cable/mechanical based tach, in general the engine will have more real time hrs. on it than the hr meter will register. another thought is just to turn on the key w/o starting engine. not sure if engine needs to be running for an electric 12v hr meter to register. worth trying out....if this is the case, don't leave the key on overnight by mistake!!! if your meter is mechanical, this might be taken into consideration for scheduled maintenance or 2nd hand purchase... apologize for lengthy explanation.

 

[s219]

As others said. Its an RPM compensating Tach.

MY PTO speed is 2400RPM. That is where 1hr running = 1 hr time.

In other words, (2400 x 60) means the engine has to make 144,000 revolutions to = 1 hr.

IF I run 2000 RPM, in 1 hr time that is only 120,000 revolutions. So it is only gonna register .83 hrs.

If I am idling at 600RPM for a full hour, thats only 36,000RPM, and thus would only register .25 hrs.

However, if I am running MAX (above PTO speed) of 2900RPM, in 1hr time it will spin 174,000 times and clock up 1.2 hrs

:confused2: I think I just went back in time 120,000 revolutions after processing all that.

 

[DK35vince]

Does anyone know how you can find out which type of hour meter you have? Is it something you have to lookup, an easy check of some equipment, or more involved? Specifically, I'm wondering about my BX25.

I think most cable/mechanical tachometers are based on engine speed for hours.
Most electrical hour meter are real time

 

[JerryK]

If you have an electrical print..... IF the hour meter just has a 12 volt and a ground connection... it probably is time based like a clock. If it is mechanical, or gets pulses from the alternator like my Mahindra... it is probably ' RPM ' related. I would not loose sleep over it either way.... in the big scheme of life.... it's not THAT important.

 

[farmer2009]

The cable style is x hours at y engine speed as previously stated.

Electronic tachs come in 2 styles.
1 is a straight time. If ignition is on it counts hours. Leave ignition on over night and it adds 8,10,12 hours.

2 the electronic tach takes a reading of rpms from the altinator. It varies output usually in milliamps. Check repair manual as the specs will be in it.

 

[Kanook]

So what I have gotten out of this is.....Don' t use your tractor hour meter for billing purposes if you are charging for contracted work by the hour.

 

[LD1]

So what I have gotten out of this is.....Don' t use your tractor hour meter for billing purposes if you are charging for contracted work by the hour.

Unless you average at or above PTO RPM for the whole time on the job, you would be loosing money.

 

[oosik]

Rather than listing the gory details - my tractor works just like LD1 in post #11. Except that my engine PTO speed is 2140 rpm. It took about five years on my previous tractor - but finally one day I noticed that the hour meter was not in sinc with my wristwatch. Called the dealer and he explained it to me.

I guess its only a problem if you use the hour meter on the tractor to charge out time on a job.

Otherwise - its kind of like trying to find a method of keeping the dirt from sticking to your moldboard plow. Hey - just plow on!!