14
2.7.2 Before shutdown of the 414 Centrifuge, it is necessary to flush the bowl with
water.
1. Shut off the feed pump.
2. Close the mud suction valve.
3. After all conveyable solids have cleared the bowl, open the water line
which tees into the pump discharge line.
4. Flush the centrifuge until clean water is discharged. Close the water
valve.
5. Stop the main drive motor. When the main drive motor is shut off, and
electrical interlock activates and will automatically shut the back drive
motor off after approximately 10 minutes.
6. If the machine is likely to be subjected to freezing temperatures, the
cover should be opened and bowl drained by removing two drain plugs
on the liquid discharge end (Item 25, Diagram 2). Drain any hoses and
pumps that may have liquid trapped in them.
Section 3 Inspection and Maintenance
3.1 Shop Inspection
3.1.1 With the cover closed and bolted down, rotate the bowl by hand and
listen for any unusual noise or scrapping. The bowl should turn freely
without drag. Any noises should be investigated. Check the G.S.
coupling to be sure it is engaged. See Section 3.6
3.1.2 With cover open, rotate bowl assembly by hand and listen for any
noise coming from within the bowl or the bearings. Any noisy
bearings should be inspected and/or replaced. See Section 5.2
3.1.3 Check gearbox oil level. Remove magnetic plugs and inspect for
metallic wear particles - See Figure 10. A large accumulation of
metallic wear particles should be investigated and the cause
determined. Refer to Section 3.2.2, Lubrication of Gearbox.
3.1.4 Inside J-Boxes, Diagram 12:
Check heater packs, Item 249, 237 for proper ratings.
Check fuses Item 245,246,244 to see if they are good, properly sized
and installed properly.
Check limit switch, Item 224, Diagram 1, which is under back drive
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