3000 tachometer inaccurate 15 percent.

bcny

Member
Tractor Ford 3000 1971 diesel, generator with tach drive.
Generator looks too new to be original, Field lug is on the OD of body, not the end. Instrument cluster is a new one from Steiner.

When at 2070RPM on the instrument cluster, the test tachometer says 1800 at flywheel. At actual 1800 rpm the PTO reads 540.
I am pretty certain the laser tachometer is correct because I tested every motor around here with it.

I could just paint a dot on the instrument cluster face at 2070 to indicate PTO. However, I am a little OCD...

When they were new were they accurate with rpm reading?
The tach drive, do they make different gears for that? Do they/did they, so can I have the wrong one? If not different gears, them maybe different tach drives? Anyone know the generator to tach cable ratio?
Or the maybe entire generator is the wrong one.
Do the instrument clusters have a calibration adjustment?
What if I replaced the 3.5" generator pulley with a 4"?
 
Changing the genny pulley is probably the easiest thing you can do. You have all the numbers; just do the math to see what a 4? pulley will do to the RPM?s. It won?t help the charging rate. A belt for a 3600 will be a little longer, you?ll probably need that. So far as I know there was only one generator mounted tach drive for the thousand series.
 

The 4" pulley will help not it'll still be off some, your's is closer than mine.
I've done alternator conversion's on three of my tractors, one shows 2100 @ 540 pto, one shows 2300 and the other I converted to engine tach drive and dash
One of the others has a new enough block that I'm going to convert to engine tach drive and dash, the other one I just have to live with.
I don't really care what the tach shows, just need a reference on where to set it for pto operations.
 

Can anyone tell me where to get a "Laser Tach" I could use on my Ford 3000 D.?

Maybe even suggest where best to find a good Dash Panel set..?

The plastic on this one is totally History..

Gen is not original..no tach-drive on the end...

Don't really need the "Dash", just would like a Tach that works...!

Thanks...!
 
Just for grins, run the throttle to max with the engine unloaded; clutch depressed. What does the tach say? If the governor was set per spec the rpms should be 2200 or near it withing 100 (guess) rpms...I have 3 and all satisfy this presumption. If it's off by 15% it's off. If it's DN0 suspect your flywheel tach.
 

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