Veris-technologies Quad 2800 Soil EC Mapping System - Operating Instr Manuel d'utilisateur télécharger pdf (Page 32)

OM17-Quad2800

6-10

Procedure #4 Spring Plunger adjustment and replacement

The spring plungers are located in the center of each disk electrode hub cap, and are vital to

maintain good continuity through the disk hub bearings. They are factory preset, and should not

need routine adjustment. If a continuity test shows abnormally high resistance, the plungers

should be checked. This may be performed in the following manner:

1) Check disk hub bearing preload by grasping disk blade and pushing from

side to side. If there is any noticeable movement, bearings are failing --and

this can damage the spring plunger; see procedure #8 for replacement.

2) Remove the locking nut.

3) Remove the plunger by turning counter-clockwise.

4) Depress the spring loaded tip on a hard surface to determine if plunger has

adequate tension and can move freely.

5) If the plunger will not move freely, replace. Coat the threads with di-electric

silicone grease before installation.

6) If the plunger appears to be in good working order, reinstall in the hub, and

adjust until it bottoms against the spindle end. Rotate 1/2 turn backward to

allow adequate clearance. Improper adjustment will result in premature

failure (too little tolerance) or poor continuity (too much tolerance). See

Figure 4.1 below to view proper clearance.

7) Reinstall locking nut and tighten firmly. Do not allow plunger to rotate while

the locking nut is tightened.

8) Re-test disk electrode continuity

Figure 4.1

In some cases, you may have to remove the hub cap to service the spring plunger, if the

plunger is rusted in the cap, or if the readings are still unsatisfactory with the new plunger

installed.

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Veris-technologies Quad 2800 Soil EC Mapping System - Operating Instr Manuel d'utilisateur Page 32