20
3.4 Cleaning
Cleaning and inspection should be done every 100 hours when bearings are
lubricated. Cleaning may be needed more often when conditions are severe.
3.4.1 With the cover open, hose down the inside of the vessel and the outside of the
bowl. Pay particular attention to removing any solids buildup around the
solids discharge bushings (See Item 86, Diagram 2). Also, remove solids
buildup inside the cover.
3.4.2 Inspect the solids discharge bushings for wear. Worn bushings should be
replaced before any wear has damaged the bowl. See Figure 29 and 30
3.4.3 Inspect wear shield in cover for excessive wear and replace if necessary.
3.4.4 Inspect magnetic plugs in gearbox for metallic particles and check oil level.
See Section 3.2.2
3.5 Belt Tensioning
3.5.1 Belt tension should be checked routinely when lubricating bearings.
3.5.2 The following procedure for belt tensioning should be used starting when a
new 414 Centrifuge is put into service or anytime belts are replaced.
It is important that the belts are correctly tensioned. A belt that slips on its
pulley is exposed to abnormal wear. If on the other hand the belts are too
tight, this will cause wear on the bearings.
Proceed as follows to get the correct tension:
1. Collect the belt slack on the upper side. Adjust the pulley center
distance by moving the motor until the belts have a light tension.
Rotate the drive parts a few turns by hand.
2. Adjust the center distance so that all belts are lying well. Start the
motor and run for approximately 10 minutes so that the belts can adapt
themselves to the grooves.
3. Stop the motor and adjust the center distance until all belts are lying
evenly and are properly tightened. (A stretch of 1/2 - 1% of the belt
length will not damage the belts)
4. New belts should be retensioned every two hours during the first day
of running. After this, further tightening may be unnecessary, as the
length of the belts remains practically constant. When changing belts,
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