Veris Technologies Quad 2800 Soil EC Mapping System - Operating Instructions User Manual
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OM17-Quad2800
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Figure 3.5
2. If ohms jump over 2 ohms when the blade is rotated, and you were careful to maintain good
contact between the lead and the blade, the problem is likely inside the hub. Because
electrical signals cannot be sent consistently through the disk bearing, Veris has designed a
more reliable path for the EC signal to travel. A special hub with a spring plunger presses
against the bolt through the bearing, serving as a commutator. Shown below in Figure 3.6
is a view of the hubcap and plunger assembly. When ohm readings jump during blade
rotation, it is due to the balls on the bearing making intermittent and inconsistent contact.
See Maintenance and Service procedure #4: Spring Plunger adjustment and replacement
on adjusting and replacing spring plungers.
Figure 3.6