Changing fuel filter on NH 3930

   / Changing fuel filter on NH 3930 #1  

AlbertC

Silver Member
Joined
Jan 4, 2010
Messages
139
Location
Perry, GA
Tractor
New holland 3930
I need to change the fuel filter on my 3930 but have never done it for fear that I may get air in the system and not be able to get it started back up. I have a few questions.

What procedure should I follow to hopefully Change the filter without any problems?
1. Turn off the fuel supply
2. Unscrew the old filter
3. Take the new filter and fill it as full as possible with diesel and screw it back on.
4. Turn the fuel supply back on.
5. Cross my fingers and hope it will start back up.

If it doesn’t start back up, what do I do. pics of my set up attached

F7B3034C-E260-4354-8E88-12A9526A6571.jpeg
 
   / Changing fuel filter on NH 3930 #2  

bearthebruce

Gold Member
Joined
Jul 26, 2018
Messages
380
Location
Property is in Floyd County VA
Tractor
'05 Massey Ferguson MF1533
If it doesn't start, air has been picked up in the system. It has to be bled from the system by "opening" a line further downstream from the fuel filter.

I would assume New Holland has a procedure. Tractor Mike on Youtube had no fuel flow in his New Holland and he shows how he resolved...
 
   / Changing fuel filter on NH 3930 #3  

RjCorazza

Veteran Member
Joined
Apr 6, 2000
Messages
1,924
Location
Maryland
Tractor
Kubota L4060 Cab, ZD1211, ZD326
Definitely check the operator's manual for the procedure for your machine. My diesel mowers are self bleeding, meaning I just leave the key in the running position and the electric lift pump bleeds the system. My Kubota L4060 has a bleeder screw on top of the filter housing that is opened while allowing the electric lift pump to move the air out. Some (many?) Diesels have individual bleeder screws on the engine.
Hotly debated topic, but I do not prefill fuel filters for contamination concerns.
 
   / Changing fuel filter on NH 3930 #4  

mrmikey

Veteran Member
Joined
Oct 17, 2010
Messages
1,453
Hotly debated topic, but I do not prefill fuel filters for contamination concerns
If you're the type of person that has to prefill the filter, fill the outside smaller holes as that's the direction of filter fuel flow. You fill the center hole and you're possibly dumping dirt into the system...........Mike
 
   / Changing fuel filter on NH 3930 #5  

ruffdog

Super Member
Joined
Dec 31, 2011
Messages
8,179
Location
southern wisconsin
Tractor
Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
Here is a video of a similar tractor that has a different type fuel filter housing that has a bleeder on top. Your housing must have a bleeder too or crack the line going to the pump.

 
   / Changing fuel filter on NH 3930 #6  

MacAttack

New member
Joined
Sep 15, 2007
Messages
15
Location
LaSalle, MI
Tractor
JD 4400
Your fuel tank should be above the engine. Least it is on the 3000 series that we had at where I worked. Find the fuel shut off valve on the bottom of the tank. Turn off the fuel then take old filter off and install new one. Open the valve. You should not need to bleed anything. Gravity is in your favor. Give it a few minutes for the fuel to work its way through and then try starting. If it doesn't start the filter in the tank at the fuel shut off may be plugged. You can try Tractor Mikes way to clear the obstruction but, I would plan on removing the valve and doing it properly. It's a PITA but it's better than getting stuck somewhere.
 
   / Changing fuel filter on NH 3930 #7  

Coldtrailer

New member
Joined
Aug 23, 2014
Messages
10
Location
Northern Wi
Tractor
New Holland 3930, Ford 3400, Ford 2000
I see that this is a older thread, but have the same filter configuration on my 3930 tractor, and mention what worked for me.
I bought the tractor used and have no manual so trying to find anything on fuel filter replacement procedure wasn't readily available.
From what I learned, the steps to shut off fuel, remove filter, replace filter, turn on fuel, wait a while (make sure tank is near full of fuel to fill filter by gravity) and it will self prime and tractor should start are all correct.

Well I did that and when I started the tractor it did start and ran for about 10 seconds then sputtered and died, I remember someone saying last resort crack the fuel line connections at the injectors and crank the tractor (about 5-10 seconds) till no more air bubbles and solid fuel comes out.
So thats what I did and after tightening the connections, think they are 5/8ths wrench, and tried starting the tractor, presto started right up and has since.
Just want to mention, I think this New Holland motor is a some kind of 'fuel emissions' type that has little different fuel and filter set up than most. I could be totally wrong, but there isn't any of the normal bleed places on this one.
Hope this may help someone with the same issues.
 
 
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