john deere 5420 fuel injection pump

[356mikey]

pump governor started acting up. did not maintain rpm well at all. last shut down took about a minute to stop running. i want to fix this one, but i had another pump.
other pump was installed due to misdiagnosed fuel problem. previous owner had installed inline fuel filter above transmission which clogged, out of sight. it was finally discovered when i replaced all fuel hoses and installed electric boost pump. this tractor did not have a tank outlet strainer. i put original pump back on because it was working well with new filters. now this pump is not starting. there is fuel pressure to pump, and flow from fuel return pipe at top of pump, but nothing at injector outlets. what am i missing?

 

[MountainBuck]

Try pulling out the check valve in the fuel line just above the hydraulic oil filter and using compressed air to blow it clean.

 

[356mikey]

Try pulling out the check valve in the fuel line just above the hydraulic oil filter and using compressed air to blow it clean.

good thought, but i removed check valve when in ran new fuel supply hose and electric boost pump.

 

[MountainBuck]

..did you reinstall it or did you leave it out?

good thought, but i removed check valve when in ran new fuel supply hose and electric boost pump.

 

[356mikey]

..did you reinstall it or did you leave it out?

 

[356mikey]

I left it out since I had a pump to get fuel to the factory filter.

 

[thepumpguysc]

Can u hear the shut off solenoid clicking when you turn the key on.??
And does it have some electrical wires coming off the bottom of the pump .??

 

[356mikey]

Can u hear the shut off solenoid clicking when you turn the key on.??
And does it have some electrical wires coming off the bottom of the pump .??

The solenoid is getting power at key on but i don't hear much any more. I will get a non hearing impaired person to listen for me and report back. no wires on bottom of pump.

 

[356mikey]

I removed wire from pump and turned on switch. touching wire end to pump terminal makes a spark but no sound or feel a bump.
What would this take to repair? The solenoid was working when the pump was removed last year. I rebuilt the pump in my 301a ,
I feel ok about taking this on apart.

 

[thepumpguysc]

The solenoid is put in from underneath the top cover..
The cover needs to b removed.. the replacement is self explanatory..
But I feel you’ll find the original problem after removing the cover..(water/rust)

 

[356mikey]

Thanks, I'll take the cover off today.

 

[thepumpguysc]

DOESNT it have the 5 sided tamper proof torx screws.??

 

[356mikey]

Yes, it does. amazon to the rescue. Top is off and there it rust on all steel parts. I have been using off road diesel fuel, does then red dyed fuel have no rust prevention at all? The 301a i brought up from Florida was always run on regular diesel and never showed a hint of rust in the fuel system. I rebuilt the injection pump in it about 5 years ago and it was clean and shining inside.

 

[thepumpguysc]

Additives are left up to the end user.. PERIOD..

 

[356mikey]

Additives are left up to the end user.. PERIOD..

correction: it does have a magnet coil on the bottom but the wires are tied up, and not plugged in.

 

[thepumpguysc]

They go to the radiator neck temp. sensor for a cold start solenoid on the pump..
The sensor is a very weak spot.. when it shorts out, it blows the fuse for the shut off solenoid..
The easy fix is unplug it and replace the fuse and off u go.
If u want it fixed, your local JD dealer will have a handful of the temp sensors in stock..
It’s not needed if ur in a warmer climate..
If ur in a colder climate ur gonna want it for colder starts..

 

[356mikey]

They go to the radiator neck temp. sensor for a cold start solenoid on the pump..
The sensor is a very weak spot.. when it shorts out, it blows the fuse for the shut off solenoid..
The easy fix is unplug it and replace the fuse and off u go.
If u want it fixed, your local JD dealer will have a handful of the temp sensors in stock..
It’s not needed if ur in a warmer climate..
If ur in a colder climate ur gonna want it for colder starts..

Good information. I'm in the middle of Kentucky and had no trouble last winter. I will leave it unplugged . My instruction paper is missing torque value for roller retainer leaf spring. specification dimension for maximum roller to roller is also hard to find. my pump is a
db2 435 - 5354

 

[thepumpguysc]

The leaf spring doesn’t have a torque.. that’s the screw for max fuel delivery..

 

[356mikey]

The leaf spring doesn’t have a torque.. that’s the screw for max fuel delivery..

I see. It limits the roller movement. I set it for the specified dimension while giving it air pressure.
Now i need to find torque for the delivery valve. It feels like the stop is bottomed out on the delivery valve before the plug is flush.

 

[thepumpguysc]

The stop bottoms out in the ROTOR.. it should never touch the dv..
Btw. U HAVE TO USE A NEW STOP ..