Lexion 650 straw walker losses

Straw walker loss on a Lexion 650 almost always traces back to walker step condition, cylinder/concave clearance, or ground speed outrunning the walkers' capacity to shake grain free before the straw exits. At the hours this machine likely has, worn walker fingers/steps are the top suspect.

Ranked causes and first checks:

1. Worn or broken walker steps/fingers. Over years of heavy straw, the aggressive teeth on the walker troughs round off or snap, so grain rides the straw mat straight out the back instead of shaking down through. Pull the rear cover and look down each walker trough with a light, feel the step edges for roundness, and check for any bent or missing fingers.

2. Concave clearance too tight or drum speed too high for the crop. This over-threshes straw into short, tangled pieces that mat instead of tumbling loose, burying grain in the walker discharge. Back off concave clearance slightly and drop drum speed 50-100 RPM, then watch the loss monitor for a change within a few hundred meters.

3. Ground speed outpacing walker capacity. If you're pushing tonnage the walkers can't process in the time the straw is on them, losses climb even with everything mechanically sound. Drop ground speed 0.5-1 km/h and see if losses fall proportionally — if they don't, it's not a speed problem.

4. Uneven header feed or side-to-side crop bunching, which overloads walkers on one side while the other runs light. Check for consistent mat width and thickness across the full feederhouse on the walkers themselves, not just at the header.

5. Walker crank bearings or drive timing out of sync, causing dead spots in the shaking action along one or more walkers — less common but worth a visual check for any walker not moving crop as vigorously as its neighbors.

Since this is broad, adding the crop type, straw condition (wet/tangled vs dry), and whether losses are worse on hills or level ground would sharpen this to one specific mechanism.