injector pump

curtis cothran · May 30, 2020

Last year I bought a YM2000 from a friend who had let it set outside for several years. The engine was almost stuck but I managed to get it freed up. changed all fluids and dropped "oil Pan" and cleaned out. tractor would not start. after soaking the injector pump for a couple of weeks in Kroil Oil I was able to disassemble it. It looked like new on the inside just stuck from old diesel. Got the tractor running and it ran ok. Out of concern that I did not have in completely timed even last week I decided to change the injector pump. I had one that another friend gave of his tractor with a cracked block. to make a long story short once installed the rack locked up. so I pulled it off and put mine back on. Now I do not have full rack movement when the rack is hooked up to the governor. Nothing looks broken or slipped. What have I done?
thanks
Curtis

thepumpguysc · May 31, 2020

Curtis.. Thats kind of a "hands on" problem.. I doubt that you'll get any kind of a diagnostic answer that would help..
Those engine racks are made out of VERY thin pot metal & VERY easily bent..
U didnt have to adjust any of the screws when u installed the other pump did u.??
How about the solenoid plunger being bent, {happens ALL the time} limiting the rack movement.?? {if equipped}
Good luck.

winston1 · May 31, 2020

Assuming your rack has full free movement by hand?? Is your lack of movement not allowing idle or high speed? Here is a drawing of the governor assembly for what it's worth.

curtis cothran · May 31, 2020

I understand the hands on, I am fairly mechanically inclined, but this has me baffled. Nothing was adjusted and everything looks good. I do NOT want to touch the governor assembly unless something is wrong.

curtis cothran · May 31, 2020

Rack will move freely by rocking the pump back and forth, but when connected to the governor arm the movement is restricted.

winston1 · May 31, 2020

curtis cothran said:
Rack will move freely by rocking the pump back and forth, but when connected to the governor arm the movement is restricted.

Restricted in low, high, or both speeds? Will it idle, will it obtain full throttle?

curtis cothran · May 31, 2020

it wants to run at a very high speed. I have not tried manually operating the rack and starting it. that will be my next step.

winston1 · May 31, 2020

I think that would be the thing to do and watch governor action. At this point without rack sticking it would point to governor problems.

bmaverick · May 31, 2020

curtis cothran said:
it wants to run at a very high speed. I have not tried manually operating the rack and starting it. that will be my next step.

I would agree with Winston's input, it's the governor. I had a JD 850 with the Yanmar 3T80. The person who did the engine rebuild, bent the governor shaft and also swapped the 2 & 3 injector lines to the engine. It would only run on HIGH (full throttle). As you had stated, the engine was sort of STUCK. Getting it freed may have wither bent the governor rod or other governor damage that needs looking at.

BTW, I was a newbie with the condition of the JD 850 and the engine ran for 3 hours full throttle because I thought it was meant to be. The head got cracks and the block cracked. The engine seized and failed. The mechanic said it would run fine like that. So, I ran it. The JD 850 was a former beater of a machine. I got it free as a DIY fixer.

Hey, I use to live up TN49 from your location 5 years ago. You're in a nice part of the state.

curtis cothran · Jun 1, 2020

it is a nice area, getting a little crowded here lately. I have not took the time to start it with the governor disconnected yet, but I have studied everything that I can see and do not see and thing that looks wrong.
thanks
Curtis