John deere 850 fuel pump - no output

[dodge man]

There is often a lift pump, just a small pump to get fuel to the main injection pump. Does your tractor have one and if it does is it working?

 

[Chuck_L]

Alright, I'm holding off on tearing the back side of that pump apart. I have my doubts that there is anything wrong with it, but I suppose we will see.

I figured maybe you kind gentlemen might provide me some feedback regarding the fuel flow I am getting, and what the problem with the pump actually looks like. So I'm going to try to post a couple of video links here:

Fuel flow video:

Injection Pump video:

 

[Chuck_L]

There is often a lift pump, just a small pump to get fuel to the main injection pump. Does your tractor have one and if it does is it working?

Nothing that is aparant. Here's what I see: fuel tank > fuel line > fuel filter > fuel line > injection pump.
The fuel filter assy has the fuel shut of valve built in along with two bleeding screws, one prior to the filter and one post filter.

 

[Chuck_L]

Did u happen to see the slot on the barrels u removed.??
They HAVE TO SLIDE ONTO A LEAD PIN..
If u just dropped them in and tightened up the “top nut” u sheared the pins off..
U might as well stop now…
There’s nothing in the pump u can repair, other than a leak..

Thanks; no I did not shear off the pins

 

[bmaverick]

Matt at the YTOG made this very informative video on the Yanmar fuel pump you have on the JD850.

If all that doesn't get you going, then the guy you've been chatting with here is,

Mike the pump guy - Master Injection Pump Rebuilder
For Japan made tractors, namely many of the brands including Yanmar / Deere for fuel pumps.
Mike can be reached on our message board from time-to-time, The best way is via email he typical monitors very often at:
thepumpguyscATaol.com
( replace the AT with the @ symbol when emailing please )
- Mike has 35+ years in the industry with injection pumps and hydraulic systems.
- He is very well versed in the JIS and SAE standards for parts to ensure proper components are used for rebuilds.
- From Sunny South Carolina.
- When sending parts via mail, please be sure to have insurance for a bit more than what you can find it new due to carrier issues that 'could' happen.
There are many positive testimonies on many of the Industrial Equipment, Heavy Equipment, diesel boating, tractor and other forums on his work and professionalism.
Shout out to The Pump Guy | Heavy Equipment Forums
(2) Thepumpguysc rocks - TractorByNet
Timing fuel injection pump - Yesterday's Tractors (yesterdaystractors.com)
Ford 3600 leaking from where fuel inlet meets injector | My Tractor Forum
The Pump Guy - Yesterday's Tractors (yesterdaystractors.com)

Mike has his exclusive repair info page at the Yanmar Tractor Owners Group.

 

[bmaverick]

Thanks; no I did not shear off the pins

FYI. as you mentioned the fuel filter+bowl and shut-off,

Yanmar Tractor Fuel Filter & Bleeding Video

Bleeding Yanmar Fuel System

All States Ag Parts is the leading supplier of tractor, combine, skid steer and other ag-related parts to North America. We sell new aftermarket, remanufactured and used parts.

www.hoyetractor.com

 

[careyo63]

There is a O-ring that goes around the top of the fuel bowl. Had mine go bad when I was replacing and cleaning the Fuel Filter. It was brittle and leaked enough so You could not bleed the Filter and bowl. Bubbles showed up trying to bleed the pump! Dirty filter and air in the line is a common problem. That's one super dirty filter in the #12 pic.!! What they should look like.

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And if your Running Red Die off Road Diesel it really hard to see the Filter itself for that matter. Check your rubber Lines for cracks/air leaks also. Make sure the one on the filter isn't pinched shut inside from the bend at the filter connection.

 

[Egon]

There is a O-ring that goes around the top of the fuel bowl. Had mine go bad when I was replacing and cleaning the Fuel Filter. It was brittle and leaked enough so You could not bleed the Filter and bowl. Bubbles showed up trying to bleed the pump! Dirty filter and air in the line is a common problem. That's one super dirty filter in the #12 pic.!! What they should look like.

Attachments

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  1678719056090.png

  4 MB · Views: 153

And if your Running Red Die off Road Diesel it really hard to see the Filter itself for that matter. Check your rubber Lines for cracks/air leaks also. Make sure the one on the filter isn't pinched shut inside from the bend at the filter connection.

 

[Egon]

If there is a solenoid in front of the Injection pump check to see if there is a thermistor involved in controlling the solenoid.

The solenoid disables the injection pump. They as ten dollar or so item for the the thermistor. The solenoid gets more expensive.

 

[bmaverick]

If there is a solenoid in front of the Injection pump check to see if there is a thermistor involved in controlling the solenoid.

The solenoid disables the injection pump. They as ten dollar or so item for the the thermistor. The solenoid gets more expensive.

Nothing like this on a vintage Yanmar made into a Deere. Not even a computer.