Ford NAA Hydraulic adjustment

There is a cam attached to the rocker shaft that is inside the lift housing.This is what the outside lift arms are attached to.The ram rod for the lift cylender's rear end is attached to the lever cast beside the cam.There is a cam follower that is pressed into the control linkage.It is a pin of approx. 5/16" diameter and one inch long.There is no lubrication at this point in the lift and the pin wears out causing the gradual lose of adjustment travel.The pin must be replaced and the linkage re adjusted as per specifications which I don't know off the top of my head and which usually takes a feeler type gauge to measure between the control valve head and the cylender housing where the control valve goes into the spool in the housing. Now is definately the time to replace the cam follower pin. That much wear does make a lot of difference in how the lift works and when it starts to lift according to where the lift control is positioned.
I would defininately obain the correct part to replace it with.Don't go with a cut off bolt etc. as it will wear down too quick.If you are going to consider using a bolt etc you may as well leave the old pin in place because with it worn half way into it out last a bolt etc.
I shouldn't tell you this ,but I have used and ole valve stem by grinding off a piece of proper length.The repalcement is a hardened pin and it has to be hard to prevent rapid wear.Their is no lubrication to the pin. If you foolishly decide to use a valve stem it should be measured with a micrometer to assure the right diameter.If it is a couple of thousands too smalll it may fall out and if it is too large you will ruin the hole it goes in,then the right pin will fall out. Be sure and support the linkage as close to the pin hole as possible while driving the pin in or out.You can do this by holding a long heavy flat ended bar by the pin as it is driven out with a punch of correct diameter. Usually takes two people to do it. One to hammer and one to cuss.

If the pin is not worn too much and can be removed without too much damage you can turn it over to the unworn side and put it back in. Just be absolutely sure it is not expanded in size by hammering on it as it will ruin the hole size it goes in and then you will really have problems.