Specifications

Document No. DER05022 PREVENTIVE MAINTENANCE
Page 4 of 10 Effective Date 25 May 07
Drive Belt (Cont’d)
6. Tighten motor mount adjustment bolts to apply sufficient belt tension to permit deflection of
5/8” with 20 lbs. of pressure exerted at the midpoint of the belt. After correct tension is set,
tighten motor mount bolts.
7. Install belt guard, and latch in place.
8. Insert feed tube into feed tube support until shoulder fully contacts support, and tighten screws
to specification listed in
DER05018.
Rotating Assembly
Maintenance of the rotating assembly requires disassembly and can only be performed with the
assembly removed from the case. After removal from the case, the rotating assembly is oriented
with the solid end down and placed in the support stand to facilitate removal of the liquid bowl
head and conveyor. The following paragraphs describe maintenance procedures for the rotating
assembly.
Removal and Disassembly
1. Shut down, lock out, and tag out electric power to the centrifuge.
WARNING! ALWAYS ALLOW MACHINE TO COAST TO A COMPLETE STOP
BEFORE OPENING COVER OR REMOVING GUARDS.
2. After bowl assembly has coasted to a full stop, loosen screws securing case cover until
screws are disengaged from lower case, and raise cover.
3. Remove feed tube and drive belt.
4. Remove top cover from gearbox enclosure.
5. Remove the gearbox as follows:
a. Remove six screws securing gearbox (Figure 5022-3) to flange.
b. Install two 3/8”-16 jack screws into gearbox flange clearance holes, and alternately turn
both jack screws a few revolutions at a time to begin separating gearbox from flange.
c. Support gearbox during remainder of procedure using a lifting strap and suitable hoist.
d. Fully separate gearbox from flange by alternately turning jack screws until unit is fully
detached.
e. With gearbox supported by lifting strap and overhead lifting device, CAREFULLY slide
gearbox outward until free of splined shaft. Place gearbox in plastic bag to prevent
contamination.
6. Tighten nuts on pillow block alignment pins to jack out pins, and remove pins.
7. Remove bolts securing pillow blocks to base mounting pads.
8. Attach lifting straps at two locations on rotating assembly and, using a hoist capable of
supporting approximately 2000 pounds, lift and remove rotating assembly from case.