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Hi, got a massey 835 ds french version with a 23c 4 cylinder diesel. changed all the filters oil and new fuel and starts on the button but ticks over at 1200 rpm and smokes like hell.
If I pull out the "stop" button some way it calms down and I can get it to tick over at 700 rpm and it stops smoking and sounds great but the throttle doesn't work so much and only goes up to 1400 rpm, then doesn't slow down when you decelerate.
guessing the fuel pump is a bit screwed. The throttle only adjusts the butterfly valve in the air intake?? you can feel the the stop lever pulling your fingers when you open the throttle is that a vacuum thing? not sure how these things work? it is a lavalette fuel pump!! I have other vintage diesel things and the throttle is always linked to a bar through the fuel pump.

any pointers much appreciated

thanks
Hank
 

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I am not familiar with that tractor, but if it has a lift pump it could be faulty. Many lift pumps have a fuel strainer or filter built into them and it could be clogged. You could have trash in your fuel tank as well. If your system has a shutoff valve in the fuel line from the tank to the lift pump it can have trash there or not be completely open. Just a few things I would rule out before jumping on the injection pump.
 
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