DeZurik LA-6 Instruction - Page 8
Browse online or download pdf Instruction for Controller DeZurik LA-6. DeZurik LA-6 9 pages. Manual & electric actuators
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LA-Series Manual & Electric Actuators
Reassembly and Installation
1. Clean all parts and remove old sealant from the actuator cover.
2. Restore the key and keyway in the valve shaft to original condition.
3. If the yoke bearing (B2) in the bottom of the housing is worn, replace it.
4. Install a new O-ring (B11) outside the yoke bearing.
5. On the outside of the bottom of the actuator housing, run a bead of sealant around the bolt hole
that goes into the inside of the housing.
6. Set actuator housing on valve. Make sure relief groove on bottom of actuator is open.
7. Insert the screws (three on models LA-4 and LA-6, four on model LA-10) that fasten actuator
housing to the valve.
8. Lubricate bearing surfaces of yoke nut and links and the bearing surfaces inside actuator
housing.
9. Partially assemble yoke nut, one guide nut (not used on LA-10), link and snap ring (one side
only).
10. Install partially assembled yoke nut assembly on yoke. On the model LA-4 actuator make sure
the curved side of the link faces the correct side of the yoke (see drawing).
11. Install second link, guide nut and retaining ring on yoke and yoke nut.
12. Place yoke and nut assembly into housing with machined end of yoke down.
13. Inspect the holes near the ends of the actuator shaft and remove any burrs made while the pins
were being removed during disassembly.
14. Insert shaft part way into housing, small end first.
15. Lubricate both sides of thrust bearing, then place on shaft with metal surface of bearing facing
toward the actuator housing.
16. Place a collar onto the shaft with the chamfered end toward the middle of the actuator.
17. Thread a stop nut onto the shaft.
18. Thread the shaft through the yoke nut. On models LA-4 and LA-6, the machined side of the
yoke nut faces away from the valve shaft.
19. Thread a second stop nut onto the shaft.
20. Place the second collar on the shaft with the chamfered end toward the middle of the actuator.
21. Install the second thrust bearing on the shaft.
22. Place shims on shaft. All shims are installed between the actuator housing and the thrust
washer that is farthest from the input side of the actuator.
23. At both ends of the actuator shaft, align the holes in the collars with the holes in the shaft.
24. Drive a pin into each collar.
25. With both actuator and valve in fully closed position, make minor adjustments to align one of the
keyways in the actuator yoke with the single keyway in the valve shaft.
26. Drive the key between the valve shaft and the actuator yoke until it is flush with the top of the
shaft. Do not "mushroom" the end of the key.
D10308
Page 8
March 2009