Veris Technologies MSP EC and pH (1997-2008 CF card drive 1.10M) - Operating Instructions - Manual (Page 19)

Veris Technologies
Pub. #OM MSP03-1
19
Wheel hubs --
On an annual basis, disassemble, clean, and properly repack the wheel
hubs with suitable wheel bearing grease. It is advisable to replace the seals.
As with any tapered roller bearing, proper pre-load will extend the
life of the assembly. Fully tighten the nut, then rotate backward up to ¼
turn, so that the hub turns freely, without endplay. Install cotter pin, and
reinstall hub cap.
Coulter electrode
hubs --
The coulter electrode hubs operate in a significantly harsh environment,
and annual inspection is of utmost importance. The double-lip seals are
designed to keep grease in, and contaminates out, but they are the cause of
practically all hub failures. It is advisable to disassemble, clean, repack, and
re-install annually. To perform this maintenance, do the following:
1) Remove hub cap by turning in a clockwise direction (left-hand thread
prevents loosening in operation).
2) Remove cotter pin, castle nut, thrust washer, and remove hub.
3) Remove outer bearing and knock out inner bearing using a wooden
dowel or brass rod. Be sure to match each bearing to its location on the
hub and do not mix bearings between hubs. Natural wear will cause the
bearing and race to form pattern that is unique to that set.
4) Thoroughly wash hub and bearings in solvent and dry.
5) Replace bearings and races that show excessive wear or pitting.
6) Pack with grease, and reassemble -- or reassemble, and pack via grease
zerk with wheel bearing or lithium grease. It is advisable to replace the
seals.
7) Adjust bearing pre-load as mentioned above. Excessive pre-load may
cause plugging in extremely loose soil conditions, and excessive endplay
may damage the commutators.
8) Inspect the sealing o-ring on the hub cap, and reinstall by threading
counter-clockwise on the hub.
9) Adjust commutator clearance as mentioned above in section on
commutator adjustments.
grease zerk