Specifications
Document No. DER05104
Effective Date 25 May 07
Page No. Page 1 of 4
ADJUSTMENTS
DE-1000 CENTRIFUGE - GEARBOX DRIVE
GENERAL
This section contains procedures for adjusting the overload release assembly torque and removal
and replacement of the motor sheave. These procedures should be attempted only by skilled
personnel who are trained and qualified to perform advanced mechanical procedures.
WARNING! THESE PROCEDURES ARE TO BE PERFORMED ONLY BY
TRAINED, QUALIFIED PERSONNEL. DO NOT PERMIT UNQUALIFIED
PERSONNEL TO ATTEMPT THESE PROCEDURES.
MOTOR SHEAVE REPLACEMENT
Changing the motor sheave is done to change the bowl speed. Available sheaves are listed in
DER04097
- Operating Instructions. After selecting the desired sheave, use the following
procedure to replace the sheave.
1. Shut down, lock out, and tag out centrifuge.
WARNING! TO AVOID SERIOUS PERSONAL INJURY BE SURE EQUIPMENT IS
LOCKED OUT, TAGGED OUT, DE-ENERGIZED, AND HAS STOPPED
ROTATING BEFORE PERFORMING MAINTENANCE AND/OR ADJUSTMENTS.
2. Loosen screws securing feed tube clamp, and slide out feed tube.
3. Release latches, and remove belt guard covering motor sheave and fluid coupling.
4. Loosen four locking nuts securing motor feet to mounting base (Figure 5104-1).
5. Turn adjusting bolts equally counterclockwise until move motor moves sufficiently inward to
release belt tension.
6. Slip drive belt off motor sheave.
7. Remove screws securing motor sheave to solid bowl head, and remove sheave.
8. Install new motor sheave on solid bowl head, and secure with hex head screws. Tighten
screws to torque specified in DER05018.
9. Re-install belt on motor sheave.
10. Tighten motor mount adjustment bolts to apply sufficient belt tension to permit a 5/8”
deflection when pressed at the midpoint of the belt. Correct tension will prevent slippage
without overloading bearings. After correct tension is set, check sheave alignment by placing
a straight edge across the bowl and motor sheaves. Sheaves must be aligned within
0.0156”.If not aligned, tighten or loosen one adjustment screw, as required. Once sheave
alignment is achieved, tighten all four motor locking nuts to secure motor in place.
11. Re-install belt guard, and engage latches to secure guard in place.