Re: 50 model fordson dextra

Posted by robert major on August 20, 2014 at 23:34:38 from (216.130.68.98):

In Reply to: 50 model fordson dextra posted by Ethan Mckeehan on August 20, 2014 at 19:51:56:

Hi
I'm Gonna take an educated guess from what you said it's a diesel tractor? if so it has the option of 2 types of fuel injection pump. The first and most likely for your tractor is a vacuum governed type. It should have 2 small brake hose sized steel lines running from by that butterfly down to a small housing held together with 4 bolts on the front or rear of the pump. inside that is a diaphragm, that senses vacuum in the manifold as the flap opens and closes. Revving it up or down

This is then attached to the fuel delivery rack in the pump, to make that do what ever it senses.
it sounds to me like that Diaphragm May have a split or hole in. then it is not moving the rack as it should, the other thing could be there is a damper spring in that housing, maybe that has fallen apart and jams the rack in a flat out position. Then when you pull the stop it forces the rack to move back to low revs then stop.

sometimes the rack rod rusts and sticks to, that can cause interesting start and run problems as well. To gain access to that there should be a side plate, remove that and you can see the pump elements and the control rod. it should move pretty free by a little more than finger pressure, and return on it's own.

Make sure the pump outer is clean you don't want grit and junk in there with that cover off. Do not adjust anything in there it will mess the settings up for the pump. Just lubricate and gently free the rack if needed. I have done a few of the 4 cylinder type pumps on majors and kinda know the limit of to much force and what to do.

The other type pump doesn't have the 2 lines it is gears/ centrifugal weights in the end of the pump in a housing with oil lubrication.
The rack part of that can stick the same but the governor part could be messed up and you can't really do anything other than getting a diesel shop to look at it.

Another thought for both pumps is that the excess fuel button could be stuck in. it is a push button on the bottom of the stop arm, it should come through the pivot point in the bottom of the arm, with a little round pill shaped end on it or could be you push the stop lever in sideways and it clicks in. both types should pop out when the motor starts. if it is in ,it allows the pump rack to come back to wide open, which would give you the full revs, then the stop lever being pulled would shut the revs or stop it. Some times the button is missing and just a small rod pokes out the stop arm about a 1/4 inch or so a test is with the motor stopped push that button in, then pull the stop lever out, that button or stop arm should pop out if it's working right and depending on excess fuel linkage type .
Hope this helps some the pumps are pretty well the same design as the major, but never worked on the Dexta ones and only driven 1 in my lifetime.
Regards Robert

Replies:

• Re: 50 model fordson dextra Ethan Mckeehan 05:49:20 08/21/14 (0)
• Re: 50 model fordson dextra Majorman 03:57:47 08/21/14 (0)

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