Gleaner A Cylinder clearance marker

[ESVADuke]

I've been working on an old A. Wiring for new cab airblowers, LED lights, linear actuators in place of the cables for choke and throttle. Got the feeder drum repaired, new concave bars, Trimpe rasp bars. Steel Manchester raddle chain waiting on me.

My question relates to adjusting the cylinder clearance. I've put a 1/4" steel bar on a concave and dropped the cylinder so a rasp bar sits on the 1/4" spacer. Adjusted the indicator on one side to read 1/4". The indicator scale on other side was messed up, and I made new marks with a ruler and chisel, only to find out the marks on the original indicators were not true to a rule scale (see pic)
So what do I do.
1. I'm guessing I need to make a new marker plate and mark a scale to match the original, but why is it not a true scale?
2. Replace both with true scale marks, but then starting points based on the manual and user recommendations will be off?

 

[paul]

They have to account for the offset. The scale is not exactly where the cylinder shaft is. As you swing the cylinder up or down in an arc, the scale pointer is moving a different actual amount.

You need to make the new scale equal to the one that is good. It wouldn’t be right if it was actual inches. You need to keep the offset!

Paul

 

[Keith Williams]

I've been working on an old A. Wiring for new cab airblowers, LED lights, linear actuators in place of the cables for choke and throttle. Got the feeder drum repaired, new concave bars, Trimpe rasp bars. Steel Manchester raddle chain waiting on me.

My question relates to adjusting the cylinder clearance. I've put a 1/4" steel bar on a concave and dropped the cylinder so a rasp bar sits on the 1/4" spacer. Adjusted the indicator on one side to read 1/4". The indicator scale on other side was messed up, and I made new marks with a ruler and chisel, only to find out the marks on the original indicators were not true to a rule scale (see pic)
So what do I do.
1. I'm guessing I need to make a new marker plate and mark a scale to match the original, but why is it not a true scale?
2. Replace both with true scale marks, but then starting points based on the manual and user recommendations will be off?

View attachment 104865View attachment 104867

You adjust the clearance to be the same on both sides initially AT THE CYLINDER. You can then move the marker plate to match that clearance..
Then when you change one side, you adjust the other side the same number of turns. You can use your ruler to check that the support is the same distance on the outside, but you will not be measuring the CYLINDER clearance. you use the scale on that plate for that.
Keith

 

[centash]

Keith is right....drop the cylinder down so it rests evenly on the concave. Set the scale to zero inches clearance, on both sides, and adjust up from there, keeping the cylinder level and evenly spaced above the concave. As you begin operation of the combine, and need to adjust the cylinder, make the same number of turns up or down on each side. This will ensure even clearance across the concave....unless your concave door is bent or twisted.

Ben