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Exactly. When "adjusting" the FDC you will need to keep this pressure . Not when the injection pump is on the vehicle.

OK, since there still seems to be problems with people "visualizing" this FDC movement. I'll post a picture trying to show you what is happening. When different fuels are used the "Servo Piston" will move into different areas on the "moveable plate" . I've marked these areas to show you what I...

The FDC plate will constantly move according to what pressure is exerted against the piston. There is no "regulator" in the FDC which would hold pressure at a constant. During "testing" of the FDC you would use a "constant" pressure and the FDC would be expected to hold the appropriate pressure...

Yeah, basically once the FDC is out of the picture you don't need to worry about the Droop screw again.

I got a personal message today about the "droop" adjustment. There has been a lot of confusion about this function so I decided to try and explain what the droop function is for. In one sentence "it maintains engine RPM " . Now here's an example. In generators when your under load you can...

There is a pressure relief valve under that 12 point screw. You should remove it and clean out the hole.

I see people where still posting wrong information here after I left. So again I will try and show you how the plate in the FDC still moves all the time. As you can see from the diagram the wedge plate is connected to the piston which moves according to the pressure exerted against it. This...

Yes. Replace all the hose's. I replaced mine with Stainless Steel wrapped Teflon hose. The shop charges me about $20.00 each. These hoses will last my lifetime and that of my sons.

I just want to say one more thing about the FDC and it's function. Think of it as a "voltage drop" compensator. If you have a long electrical cable you will end up with voltage drop across the ends. So what the FDC does is build in a compensation for this voltage loss. Just like copper has one...

Depends. Is the engine surging now ? If it is then you would need to either increase fuel or decrease fuel. So since we don't know you would have to try clockwise 1/4 turn and if that didn't help then turn it back 1/2 turn. Either way it is trial and error adjusting.

I think we all got side tracked with the whole FDC thing so I will try one more time to explain. Now before you say that is not the same pump, take a look at it's function. It is the same principal and almost the exact same design as our pumps. First off forget the FDC and just think of the stop...

First off the fuel pressure is not set at one regulated pressure. If you have a pressure gauge on your filters you can see that for your self. The TM says the pressure range is 30 to 60 psi. That is not a set pressure." Second, the droop screw helps keep the engine from surging by keeping the...

The stop plate is continually being adjusted in small increments according to fuel pressure at that time. Since fuel pressure is adjusted according to engine RPM then that means the FDC is constantly adjusting and the amount of adjustment is dependent on the calibration of the FDC for which fuel...

I haven't bypassed mine yet. I probably will sometime in the future.

This might help you better understand the function of the "droop" screw. When the droop screw comes into contact with the stop plate first, it prevents excessive fuel delivery during acceleration and at medium speed under load allows the turbocharger time to spool-up preventing excessive smoke.

The droop screw keeps the governor from surging wildly by coming into contact with the "stop plate" before the "cam" . I think I know what the problem is here. Your not taking into account that the stop plate moves during operation. It is not stationary, but slides up and down according to fuel...

What you need to do is look at the TM and you will see how the governor works. I can try and explain with words tell the cows come home and you will still not understand until you "see" it. TM 9-2910-226-35 is a good TM to use.

It pushes back against the governor which is trying to shut-off the fuel. Basically it acts as a buffer spring, even though it is not a spring.

It basically helps keeps the governor from surging conditions, but in all honesty just using your foot to adjust the fuel if your slowing down is better in my opinion. That is why I believe the TM manuals don't go into such great detail about the droop screw. Now in generator applications that...

This is some more information about the different settings of the LDT and LDS pumps. Picture one shows how to adjust the main fuel on the "Fuel Density Compensator" . Picture two shows how much the LDT pump should put out at 2600 RPM's (37.5 to 38.5 cc/500 strokes) . Picture three shows how much...