D-Series Syringe Pumps - Isco

D Series Syringe Pumps
Section 5 Pump Maintenance & Repair
gap
gap
Shear Key
shear key for
65DM
shear key for all
other models
Locking Pin
Figure 5-4 Shear key replacement
5.8.1 Replacement Using
Installation Tool
5.8.2 Replacement Without
Installation Tool
A shear key installation tool (part #60-1248-135) is available
from Teledyne Isco.
1. Insert tool into ball screw so that the slot on ball screw and
tool are lined up, then lock with locking pin.
2. Rotate the ball screw until the broken halves of shear key
are realigned (Figure 5-4, above).
3. Remove the broken shear key halves by gripping them
with pliers or vise grips and pulling them out.
4. Insert the new shear key into the slot with the gap facing
away from the shaft, as shown above. Push the shear key
about 1/2-way into the worm gear. Do not push it all the
way in.
5. Remove the tool and proceed to the final steps in
Section 5.8.4.
1. Follow steps 1 through 5 in section 5.8.
2. Insert the cotter pin into the ball screw, and screw the castle
nut onto ball screw, with the slot on castle nut outward,
as shown in Figure 5-4.
3. Use a 3 4" wrench on the castle nut and rotate the ball
screw clockwise until the broken halves of the shear key
are realigned (Figure 5-4, above).
CAUTION
Never use tools on the ball screw. Doing so will render it inoperable
and beyond repair.
4. Remove the castle nut and cotter pin.
5-11