D-Series Syringe Pumps - Isco

D Series Syringe Pumps
Section 5 Pump Maintenance & Repair
Ball screw
Inner bearing
set (not accessed)
Worm
gear
Shear
key
Outer bearing
set
Spacer
Figure 5-6 65DM Shear key replacement
Proceed to the final steps in Section 5.8.4.
5.8.4 Completion of Shear
Key Replacement
1. Slide the spacer onto the ball screw. The spacer will push
the shear key into proper position. Install the castle nut on
the ball screw. If the shear key isn’t completely in the slot,
the spacer will position it properly as the castle nut is
tightened.
2. Tighten the castle nut.
a. For the 65DM, torque to 200 in-lbs (23 N-m). Do not
exceed this limit, or damage to the bearings will occur.
b. For all other models, torque to 250 in-lbs (28 N-m).
3. Loosen the nut until it can be turned by hand. Tighten the
nut finger tight.
4. Insert the cotter pin through the castle nut and ball screw.
If the holes do not line up, tighten the castle nut until any
set of holes allow the cotter pin to be inserted.
CAUTION
Do not tighten the nut more than 30° beyond finger-tight to
align the holes.
5. Reinstall the access cover.
5-13