SyriXus Series Pumps Installation and Operation Guide
Section 9 Pump Maintenance, Troubleshooting, and Servicing
9-20
EAR99 Technology Subject to Restrictions Contained on the Cover Page
NOTE
Use care not to push the pieces into the gear, making them more
difficult to remove.
4. Insert the new shear key into the slot with the gap facing away
from the shaft, as shown in Figure 9-11. Push the shear key
about half-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 9.13.4
"Completion of Shear Key Replacement".
9.13.3 Replacement
Without Installation
Tool
1. Follow steps 1. through 5. in Section 9.13.1 "Shear Key".
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 9-11.
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 9-11).
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. Remove the broken shear key halves by gripping them with pli-
ers or vise grips and pulling them out.
NOTE
Use care not to push the pieces into the gear, making them more
difficult to remove.
6. Insert the new shear key into the slot with the gap facing away
from the shaft, as shown in Figure 9-11. Push the shear key
approximately half way into the worm gear. Do not push it all
the way in.
9.13.4 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 has been installed as described above, the
spacer will position it properly as the castle nut is tightened.
2. Install the castle nut with the slots facing away from the spacer.
Hand tighten the castle nut.
3. Torque the castle nut to
250 in-lbs (28 N-m)
only once. Do not
repeat this torque.