MKS T3PIA, Instruction Manual, Page: 46 / 70

Chapter Five: Maintenance and Troubleshooting Preventive Maintenance
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3. Loosen the valve cover screws (4) and remove the cover. Refer to Figure 16.
Figure 16: Four (4) Valve Cover Screws
4. Select the Pendulum Maintenance Mode Screen on the tool computer.
5. At the Pendulum Maintenance Mode Screen, select the “ Select Position Control Mode ” command.
6. At the Pendulum Maintenance Mode Screen, select the “ Move Gate to 50 Percent Position ” command.
(This will move the gate to the 50% position and allow access to the bolt(s) holding in the gate.)
7. Observe the bolt(s) attaching the gate to the main shaft. If there is only one bolt, skip to Step 8.
Otherwise, loosen the outer bolt with a ½” open end wrench. The outer bolt is the bolt located farthest
from the centerline of the valve bore.
8. At the Pendulum Maintenance Mode Screen , select the “ Move Gate to 100 Percent Position ” command.
(This will move the gate to the 100%, full open, position and allow access to the bolt(s) holding in the
gate.)
9. Loosen the remaining bolt attaching the gate to the main shaft (using a ½” open end wrench). Refer to
Figure 17.
Figure 17: Gate Bolt
10. Remove the gate.