3406b pump mod help!!

Yes hold it wide open. Full rack, full throttle what ever you wanna call it.

Screw them out a bit maybe ten turns. If you screw them all the way out no problem as long as you don't drop 'em! Just screw them back in. You will feel the screw hit the rack block just trust me. There ain't no other way to explain it. Same with the torque screw.

Before you start make sure the throttle linkage is adjusted right so you have full rack travel. You need break over at the lever there on the side of the pump that linkage is attached to. Pull it full throttle and you'll feel it stop and then there should be a little bit more pull left that pulls the top piece of the lever. You see the spring on the side lever there and feel it's pressure then.

You probably don't need to worry about the filter thing right now unless you are running to CAT to pick up all the parts.

On AFRC yes you take out the long bolts.
Once you remove the AFRC you'll see where the o-rings go. They are the same with or without.

 

I quote myself "You'll need the big yellow o-ring and the smaller 3 ones and a 5/16 Dia X 3/8 L X 24 tpi bolt to plug a oil port on the lower end, block side of it. And a 1/8" NPT plug to plug the intake manifold line hole. Use the short 2 old adjustment cover bolts to install the new cover."

The bolt will go in the bottom of the new cover. There's a hole there for IDK what. Parts guy can tell you what O-ring part nos. are, they are all the same on B and C AFRC. I am not responsible for what others have added to my post.

I'd say use the CAT piece and new o-rings or don't bother. I'd never consider making my own cover as cheap as they are.

Go to a TEPS (KW, Pete, F-liner, etc) dealer and they will always beat price from CAT house. You might have to wait a day or two until a rarely used part like that arrives as I doubt a truck dealer would stock it.

 

If you turn in the fuel & torque screws after you get them set this way for max rack, be careful to turn them each exactly the same amount of turns. I think 6,7 or 8 turns back in and you'd have a kitten instead of a CAT.


What you are doing setting screws this way is basically starting at the end. The end of rack travel is full fuel. The screws turn in to decrease rack travel. The rack is just like rack and pinion steering. It's just a rod with teeth on one side which turns the gear on each plunger which determines the scroll position and how much fuel goes to the nozzle versus gets dumped out the spill port. The plungers always go full travel by the pump cam. You need to see diagrams to get a good idea of it.