RPM gauge not working

This forum is about the Fordson Dexta, Super Dexta and Petrol Dexta.
Post Reply
Mathijs
Not Quite Blue Yet
Posts: 26
Joined: Wed Mar 06, 2013 2:15 pm

RPM gauge not working

Post by Mathijs »

After doing some work on electrics my RPM indicator stopped working. Before I dismantle the whole tractor, what is the most obvious cause? Could the cable have slipped off the gauge?

scoobyjim
True Blue
Posts: 173
Joined: Sun Mar 31, 2013 5:38 pm

Re: RPM gauge not working

Post by scoobyjim »

the square hole in clock or drive is now round and wont drive the cable???

Mathijs
Not Quite Blue Yet
Posts: 26
Joined: Wed Mar 06, 2013 2:15 pm

Re: RPM gauge not working

Post by Mathijs »

Mmmm that would be bad.

I'll start demolishing the whole thing this weekend.

Bensdexta
True Blue
Posts: 2666
Joined: Mon Sep 15, 2008 12:59 pm
Location: N Wales

Re: RPM gauge not working

Post by Bensdexta »

First off, disconnect the cable from the back of the fuel pump and twist the inner drive cable with your finger. You should see the tacho needle twitch. If it doesn't, problem is at the tacho end.

If tacho does twitch, then the prob is in the back of the fuel pump. For some reason the square section of the inner drive cable is not engaging in the fuel pump.

Have you changed the cable? If so, beware that some of the replacement cables have drive cables which are too short. I threw out my repro cable and refitted my 50yr old original - which works fine.
Bensdexta - 1961 working for a living!

Mathijs
Not Quite Blue Yet
Posts: 26
Joined: Wed Mar 06, 2013 2:15 pm

Re: RPM gauge not working

Post by Mathijs »

That was a brilliant tip, all solved now. Thanks.

Post Reply