Ym2000 Fuel pump

[Chainsaw-HT]

Been chasing a poor running issue. I think I found the cause in a stuck plunger (see attached photo, plunger is between #10-1 and # 18 on the diagram) due to some grit.
So a couple of questions.

#1 would that plunger being stuck cause a poor running condition? Best I can tell it seems that plunger should stroke to create pressure to run the injector.

#2 Did I screw up by not marking things when I took the pump apart? Is there a special method to setting the rack when reassembling?

 

[winston-HT]

<LINK_TEXT text="https://www.tracto...l-injection-service-manual.51508/</LINK_TEXT>

 

[Chainsaw-HT]

Winston. That is suuuuch a better manual than the one I have. Thank you!!

 

[Chainsaw-HT]

When timing the fuel pump, with shims, my book says “the flywheel is stopped the moment fuel is discarded from THE DELIVERY VALVE”

What is the delivery value? The injector?

I can’t figure out my base line timing.

 

[winston-HT]

delivery valve is at the discharge of the injector pump. 12-1 is delivery valve holder. https://www.hoyetractor.com/CTGY/YM2000INJPUMP.htm

 

[Chainsaw-HT]

On so I pull the injector tube from the pump, roll the engine and see when she starts to push fuel out.

 

[winston-HT]

Yes, and I might say I found this procedure not to be very exacting. Make sure you hold a backup on the delivery valve holder when loosening the injector line. The delivery valve holder is to be torqued to 29-32.6 ft lbs.

 

[Chainsaw-HT]

Winston. Gotcha. Definitely seems that way. I guess Ill take it, if I can get the darn tractor to start easier.