John Deere 2950 Tachometer input signal

[ericsundbergva]

Hello,

I am trying to help with a VDO tach on a Deere 2950.

I need to know the number of pulses per engine revolution the tachometer receives from the electronic sensor on the cam shaft.

Really appreciate any help. If I knew the number of teeth on the gear that the sensor picks up from that would help.

The dealer and manual don't seem to spec it.

 

[Andrew_D]

I tried looking on jdparts.com but there are quite a few options depending on whether the tractor has an open-operator's station, sound-gard cab, sound-gard canopy, etc. Also, a couple of dash layouts. Sound-Guard cabs have an electronic readout for the tach (as my 4250 does), however the open station tractor's have a mechanical gauge that shows engine RPM and ground speed. (Is that what you meant by a VDO tach??)

Didn't see much on there that helped I'm afraid.

Andrew

 

[ericsundbergva]

Thanks for replying. The tach or tachometer is an analog pointer type that indicates engine RPM. There is a pulse generator on an idler I believe runs at half the engine speed. But I need to know how many pulses it puts out to the tachometer for each engine revolution.