Workmaster 55 problem. Intermittent engine dying

[w4sm]

I've recently had this problem as well. Tractor either won't start or quits suddenly. Problem is definitely electrical. Jumping 12v to the fuel shutoff solenoid will get you going again but isn't the real fix, and you'll need to yank this connection to kill the tractor. I bought a new fuel module (only $9) and will give that a try, if I can figure out where it goes! If you've got the operating manual you can trace the electrical connections. There's a relay that controls the fuel shutoff solenoid on the injector pump and the relay is controlled by the fuel module. Pulling the instrument panel gives you access to the relays (haven't spotted the fuel module yet). On the Workmaster 55 the wire to the fuel solenoid is pink. You'll see this wire going into the center relay. Relays can be pulled off of their mounting post easily for better access. The control wire on the relay that comes from the fuel module is solid orange. Grounding this orange wire will activate the fuel solenoid if the power is on but the switch will kill the tractor as it should. This bypasses all the safety cutoffs like the seat switch, though. I'm going to add a "cheater switch" that will ground the orange relay wire. I'll leave this switch open normally for all of the safety cutoffs, but if the tractor quits, I'll close this switch to bypass the fuel module and get running again quickly.

 

[w4sm]

It took me the better part of an hour to find the fuel module. It's well hidden. On the "passenger side" of the engine compartment firewall are two modules on a bracket, a flasher module and a buzzer module. The fuel control module is behind the buzzer module and completely invisible. Don't try to take it off by loosening the buzzer module; you'll lose the nut and washer on the back side (been there!). Remove the bracket holding all three modules (two 13mm bolts), and it will then be easy to remove the fuel control module. You'll need a small flat head screwdriver to release the tabs holding the module into its connector. I just replaced mine and also added a cheater switch which hopefully I won't need. Good luck.

 

[Utopia Texas]

Which side is the "passenger side" of the engine. Unlike my Ford F-150 where the passenger sits on the right side, my NH T4.75 has the passenger seat to the left side of the drivers seat. So which side might you be referring to for this conversation ???

 

[w4sm]

Ah yes... US v. England.
As you sit on the seat it's the right side of the firewall. Standing in front and looking back at the engine compartment it's the left side. But you can't miss them. Both are black. Buzzer module has lots of small holes in it for sound to escape.

 

[w4sm]

Ah yes... US v. England.
As you sit on the seat it's the right side of the firewall. Standing in front and looking back at the engine compartment it's the left side. But you can't miss them. Both are black. Buzzer module has lots of small holes in it for sound to escape.

Just one more point. In looking at the old fuel control module, the connector contacts are just thin lands on a circuit board that have been "tinned" with solder. It appears that there has been wear and corrosion at the points of contact, probably due to vibration. Cleaning these up and applying a thin layer of solder over the wear spots might solve the problem at least for a while. Ideally, these contact points should be made of harder metal. Adding an anti-corrosion coating to the lands before connecting the plug might help as well.

 

[jtuck01]

How amazing a post can keep someone from pulling their hair completely out. It never failed, would go out to do something on the tractor and it wouldn't start. Then the local NH dealer would go out there, and it would start just fine. The dealer then started to try to tell me how to start my own tractor... Anyways, would any of you happen to know the part # I am looking for, and the best place to get it? Do I need to go through the local NH dealer? Thanks in advance!

 

[hog71]

Has anyone found a way to fix the problem of new holland workmaster 55 running fine then just shuts down?

 

[Harry in Ky]

I have a solution if you're willing to go around the operator aggravation module.

 

[hog71]

I am well ready for a solution to get around the operator aggravation module. I have the module out of the tractor and am in price shock of the part.

 

[Harry in Ky]

Put the module back in place. Then pull the dash out. If you look down in there you will see some relays clipped to the structure. There is one that controls the fuel shut off on the pump. You need to find it (I think it's on the left side) next. Unclip them one at a time, turn turn them around and look for one with a pink wire The pink wire that powers the injection pump comes from this relay. It's supplied from the key switch and when it's closed the pump is powered. The relay coil circuit is grounded by the module. What I have done is make a jumper wire, install it between the wire from the key switch and the pink wire to the pump, and leave the relay out. This leaves the module intact to do whatever else it does, but powers the pump directly from the key switch so the module has no effect on it.