m813 Tachometer drive gear

[seano11]

And yes I read the tm's put the pics there are very unclear. I was wondering if someone could take a picture of how there tach cable connects to the injection pump for someone reason I keep breaking tachs and cummins is saying that I need some sort of adapter for the top of the tach drive? any help would be great AND once again I did read the tm's and can't find a good clear picture

 

[seano11]

here is the part I'm talking about does the tach cable just screw into this or does it need a adapter

 

[73m819]

screws in just a speed o cable

 

[seano11]

Then my problem is I can't find a key big enough to fit the pump. How many different size's are there for these pumps ?

 

[73m819]

One

 

[seano11]

O I have already been given 2 different sizes the largest of the 2 is still 2 small

 

[seano11]

I'm kinda thinking the rebuild kit had a totally different tach shaft in it

 

[Sumner]

Hey Sean, check this thread out, has some info in it.

http://www.steelsoldiers.com/5-ton-up/49179-nhc-250-injection-pump-woes-pt-pump-ruins.html

 

[seano11]

weird the exact problem I'm having I pm'd him hopefully he can help me

 

[seano11]

Ok so if you get A total rebuild on your pump then you will need to go into a tach shop and ask to have a new tach cable built with the standard cummins key the one that is stock on the truck is normally used for gmc injection pumps and allison transmissions

 

[markmontana]

Earlier in this post there is the image of the tach cable connection. I have a truck with the cable directly connected. Of course the cable does not engage. So no tach. Cable spins freely.

Looking at other 5 tons there is a piece between the pump and the cable. See picture- it's the yellow piece. also has a couple wires. My truck has the connector that these white wires should connect to, just dangling.

What is this yellow adapter called? I need one! BTW- my M923 runs like a champ! Just want a tach.

 

[DemocracyEnaction]

Yes I need one too.^ Can anyone help?

 

[Swamp Donkey]

Tachometer drive adapter: NSN 6680-01-319-2354 P/N 12258931-3
Tip driver: NSN 5340-01-290-1738 P/N 12301264

I don't know if the M809 series had the adapter or tip driver since I don't have one. The M939s with the NHC250 have both. I'll take a guess and say that whether the adapter is used or not, the tip driver is still required. I'll know for sure when I have time to do away with my adapter in a couple of weeks.