Veris Technologies 3150 Soil EC Mapping System - Trouble-shooting - Manual (Page 13)

Procedure:
1) Remove hub cap by turning clockwise with a pipe wrench or large
adjustable wrench
– these caps have left hand thread to prevent
loosening during field rotation.
2) If plunger is frozen in cap, remove allen head set screw on top of
plunger and apply penetrating oil on both sides of plunger. Let this
stand for a few minutes and try to remove. If it will not back out
with allen wrench, lock vise grips on the inside portion and turn out
through inside of hub.
3) Clean all hub cap surfaces, install new o-ring, coat plunger and set
screw with di-electric grease and install as outlined above.
4) At the same time, inspect the end of the spindle. Over time the
plunger will wear a slight depression in the spindle face. This is
common, and more noticeable on high acreage units, or units that
have been operated at high field speeds. If the depression is 1/6‖
or more, carefully grind the face of the spindle. Cover the bearing
with a cloth or towel to prevent grinding dust from entering the hub
and bearings..
5) Re-install hub cap and tighten firmly. You may have to re-set the
plunger to compensate for the reduced length on the newly ground
spindle. Re-adjust as outlined above.
Note: If you are still unable to obtain favorable resistance readings, check for excessive
corrosion at the coulter blade mounting bolts, or the terminal located near the coulter pivot.
It may be necessary to grind the spindle end smooth, if a dimple has developed.