John Deere 820 wont run.

[coveredbridge]

sorry meant 3 cylinder. Beld the entire system I have fuel clear through the system but still the same symptoms. I think maybe the alternator is going bad could that cause the fuel shutoff to turn the engine off due to low voltage?

Could it be a bad fuel pump? Did you check the crankcase for "extra" oil?

 

[Egon]

Does this tractor have a fuel solenoid? If so prove the fuel delivery system and then start looking at the electrical systems and shutoff's if it has those.

 

[banditman]

I tried hooking up a battery charger to the tractor to see if it was a voltage problem but it still does the same thing. Im not sure how the shut off works on these tractors there is no selonoid on the out side of the pump like on a piston pump this tractor has a rotary pump. The lift pump is leaking is leaking but it is pumping could this be the problem that it is not pumping enough fuel?

 

[Tx Jim]

banditman
Which IP does our tractor have? Here's a parts photo of 1 the Roosamaster IP electric solenoids(parts key 9)

 

[banditman]

It has the roosamaster injection pump

 

[jenkinsph]

If the lift pump is leaking I would change it out, about $40 from NAPA iirc. I would check for 12 volts to the terminal wire on the injector pump and ground. I would use a meter to determine whether the 12 volts is constant to the solenoid when the engine dies. A 12volt test lamp probe could be substituted if you don't have a meter and should glow when the ignition switch is turned on and should stay lit while in place.

Did you check the return line as Jim recommended? That is an important point to consider and Jim is a retired shop foreman and Deere mechanic. I recommend you follow his advice.

When you have compound problems it can be confusing which is the culprit. If you start with a fully charged good battery it should be able to run the fuel solenoid for quite a while so that would eliminate the voltage issue.
I would change the lift pump if it leaks because it may be sucking in air causing your problem but more importantly it may be leaking diesel into the crankcase thinning the oil.

I would also (out of curiosity) take a fuel sample from the bottom of the tank in a clear glass to see what the fuel looks like. There should be a petcock there for this purpose. My 820 had one and had a fuel cut off there too.

 

[banditman]

Just found that there is diesel in the oil. So does that mean that it is the lift pump or the injection pump?

 

[Tx Jim]

Diesel fuel in crankcase could be from lift pump or IP.If it was my tractor I'd change lift pump 1st because it the easiest to change.

 

[coveredbridge]

I had this issue with my 820 several years ago. I think it could be either, but I was advised to replace the lift pump first as it was the more likely culprit and much cheaper than replacing or rebuilding the injection pump. I replaced the lift pump and haven't had a problem since.

 

[buickanddeere]

banditman
Interesting how you managed to get a 4 cyl diesel when the 820 is a 3 cyl Yanmar. Maybe you meant 3 cyl.

Look for contaminated fuel in the tank. May have algae which can cause supply problems. Will need to follow the fuel lines back to the tank and be sure there is no restriction in the flow.
Also, check that the vent in the fuel cap is not plugged. But that usually shows up as a shutdown after a longer period of run time.
Be assured that there is no air in the system. The manual will tell how to check that out after filter change, I believe.

It's a three cylinder 300 series Dubuqe/Mannheim/Saran not a Yammer Hammer.