EX2900 Idle speed

[BigRosto]

EX2900 Rpm engine speed often hangs up at working speed and doesn't want to return to idle. Spraying cleaner/lube on throttle-spring assy at pump seems to help for a while only. Ant thoughts?

 

[bmaverick]

EX2900 Rpm engine speed often hangs up at working speed and doesn't want to return to idle. Spraying cleaner/lube on throttle-spring assy at pump seems to help for a while only. Ant thoughts?

Does the spring look to be weaker than new? Does the spring have corrosion?

This is right from the Yanmar manuals.

There isn't a spring in the throttle assy. Instead it rely on friction conical washers (item-2)

Looking at the parts diagram, you can make an easy adjustment, ever so slightly, back off item-10 and item-11. Then adjust item-11 to sit where it's needed to place proper tension for the throttle to behave correctly. Then tighten down item-10 to hold item-11 in place.

Should you need manuals of parts support, our Yanmar group is here to help you,

main groups.io Group

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[BigRosto]

The governor shaft sticks. Return spring and throttle shaft are free, so problem seems to be internal to the governor. Can return it to idle setting with a socket on the shaft nut. Looking for a diesel mech who can go in to the gov. and put it back together.

 

[BigRosto]

The governor shaft sticks. Return spring and throttle shaft are free, so problem seems to be internal to the governor. Can return it to idle setting with a socket on the shaft nut. Looking for a diesel mech who can go in to the gov. and put it back together.

thanks to Bmaverick. Turns out the throttle shaft was bent inside the dash. Works fine now.