Eppendorf Biological Shakers Excella E-25R - Manual (Page 31)

31
New Brunswick Scientific Operating Manual
WARNING!
The following procedures are provided for your information only.
Do not attempt to perform these service interventions yourself unless you
are an authorized service technician.
7.3 Belt Replacement
To gain access to the drive belt, your service technician will follow these steps with
reference to Figure 9:
WARNING!
Always keep fingers clear of the drive belt and pulley.
1. Set the ON/OFF power switch to OFF .
2. Disconnect the power cord from the electrical outlet.
3. Open the lid.
4. Using an Allen wrench, remove the four Allen head screws that hold the platform to
the bearing housing. Set the platform and its mounting screws aside for reuse.
5. Remove the E-ring that holds the upper bearing housing to the shaft.
6. Remove the four nuts (two on either side) from the bearing housing mounting plate.
These nuts hold the flexure arms in place.
7. Slide the upper bearing housing off the shaft, and set it aside.
8. Use the hex wrench to loosen the four hex nuts on the motor mounting bracket.
9. Gently slide the motor mounting bracket toward the righthand side of the shaker.
This loosens the drive belt from the motor pulley and the large counterweighted
pulley. Moving the motor mounting bracket forward will cause the belt to fall from
both belt tracks.
10. Remove the old belt.
11. With one hand, place the new belt around the motor pulley, and with the other hand
guide the belt around the large counterweighted pulley.
12. Move the motor mounting bracket back, until there is a slight resistance.
13. Verify that the drive belt has a slight pressure near the center. The recommended
deflection is 9.5 mm (3/8 in).