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4195KA, KB, and KC Series
1
END BUSHING
ADJUSTMENT ARM
1
END BUSHING
NOTE:
BEFORE TIGHTENING THE DRIVE FLEXURE MOUNTING SCREWS,
1
POSITION THE SHAFT SO THE END BUSHINGS "FLOAT" IN THE BEARINGS.
26A9784-E
A5682 / IL
Figure 5–20. Cutaway of Long Pivot Clevis Assembly
horizontal. Before tightening the drive flexure cap
screws (key 12), hold the pivot shaft in the middle of
the bushing end play. Be sure neither bushing is rest-
ing against the inside end of either bearing. Tighten
the drive flexure cap screws to hold the pivot shaft in
position. Adjust the length of the pivot adjustment arm
as needed until the drive flexure is horizontal. Take
care not to kink or twist the flexure when tightening the
screws.
10. Connect the left-hand end of link 5 (key 88) to the
pivot adjustment arm in the hole position noted in step
3.
11. Replace the tie bar (key 97).
12. Perform the capsular element maintenance cal-
ibration procedure in this section. Perform the control-
ler calibration procedures and, if necessary, perform
the appropriate remote set point calibration procedure
in section 3 or 4.
Replacing the Short Pivot Assembly
1. Remove process pressure from the controller.
2. Note the hole positions of links 1 and 5 (keys 88
and 90) and disconnect the links from the short pivot
clevis assembly (key 89). Also, note the screw position
of the linearity adjustment for later reference.
3. Remove the two machine screws (key 102) attach-
ing the short pivot clevis assembly (key 89) to the
mounting plate (key 77) and remove the pivot clevis
assembly.
5–24
4. Set the linearity adjustment screw in the replace-
BEARING
ment pivot assembly to approximately the same loca-
tion as noted in step 2.
5. Position the replacement short pivot clevis assem-
bly on the mounting plate, and attach it with the two
machine screws.
6. Attach links 1 and 5 (keys 88 and 90) in the same
hole position as noted in step 2.
7. Perform the capsular element maintenance calibra-
tion procedures in this section. Perform the controller
SHAFT
calibration procedures and, if necessary, the appropri-
ate remote set point calibration procedure in section 3
or 4.
Replacing the Process Drive Flexure
BEARING
1. Set the process pressure to 75 percent of the cap-
sular element range.
2. Remove the tie bar (key 97) from the capsular ele-
ment assembly by removing the mounting screws (key
103).
3. Using an Allen wrench, remove the cap screws and
washers (keys 12 and 13) to disconnect the drive flex-
ure (key 79) from the drive bracket assembly (key 84)
and from the pivot adjustment arm of the long pivot
clevis assembly (key 78). Remove the drive flexure.
4. Loosely connect the replacement drive flexure,
making sure it is straight and horizontal.
See figure 5–20. The adjustment arm of
the long pivot clevis assembly is con-
nected to a shaft that turns on bushings
at each end of the shaft. In the next
step, position the shaft so that both
bushings ''float'' inside the bearings
and do not rest against the end of either
bearing.
5. Before tightening the drive flexure cap screws (key
12), hold the pivot shaft in the middle of the bushing
end play. Be sure neither bushing is resting against
the inside end of either bearing. Tighten the drive flex-
ure cap screws to hold the pivot shaft in position. Take
care not to kink or twist the flexure when tightening the
screws.
6. Perform the capsular element maintenance calibra-
tion procedure in this section. Perform the controller
calibration procedures and, if necessary, the appropri-
ate remote set point calibration procedure in section 3
or 4.
Replacing the Process Tubing
1. Remove process pressure from the controller.
Note
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