When you look in it's a rod with adjusting bolt and nut, could be threads with nuts can't remember, can just see part of rod. that is the rack. Fuel pressure gauge just tells the primary pump on rear of pump is passing good pressure to injection pump. Two types of primary pumps were used on a 400. Early 400 used 3 lines to pump at rear of injection pump and also contained a scavaging pump. other ones had two lines. With engine running on gas remove pin from lever on side of pump and pull back lever and open bleed on injectors. If no fuel pressure there I would suspect the rack could be stuck, or in the plunger. Also depends what was done before starting. Was fuel added? was fuel low or drained, or fuel bad? If air managed to get in the system a bleed of air from filters and all may need done to remove air.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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