Fisher 4195 KB Series Instruction Manual page 64

PIVOT
ASSEMBLY A
36A9751-C
B1668-4 / IL
4. Disconnect the drive flexure (key 79) from the ad-
justment arm of pivot assembly A. Be careful not to
bend or kink the drive flexure.
5. Remove the screw (key 122), washer (key 123),
and nut (key 124) that attach the guide flexure (key
119) to the top of the pivot assembly.
6. Remove the pivot screw and spring washer (keys
109 and 112) and the mounting screw (key 102) at-
taching the pivot assembly to the mounting plate (key
111). Lift out pivot assembly A.
7. Loosen the adjustment screw (key 118) on the ad-
justment arm of the replacement pivot assembly, and
set the arm to the same length as the arm on the pivot
assembly being replaced. Tighten the screw.
8. To replace the pivot assembly, first put the spring
washer (key 112) on the screw (key 109). Then, insert
the screw through the replacement pivot assembly and
into the mounting plate and tighten. Install the mount-
ing screw (key 102) and tighten.
9. Connect the guide flexure (key 119) to the top of
the replacement pivot assembly with the screw (key
122), washer (key 123), and nut (key 124) as it was
before. The guide flexure should be straight and hori-
zontal as shown in figure 5–23. If not, loosen the
GUIDE
MOUNTING
FLEXURE
SCREW
TIE BAR
REMOTE SET POINT ZERO ADJUSTMENT SCREW
ZERO ADJUSTMENT LOCKING SCREW
Figure 5–23. Remote Set Point (suffix letter M) Parts and Adjustment Locations
4195KA, KB, and KC Series
ADJUSTMENT
LINK A
SCREW
LINK B
LINEARITY
ADJUSTMENT
PIVOT
ASSEMBLY B
MOUNTING
SCREW
CAPSULES
screws (key 122) and retighten to eliminate any bow-
ing. Loosen the screws (key 139) and raise or lower
the pedestal assembly (key 105) to get the link hori-
zontal. Retighten the screws (key 139) and ensure the
diaphragm assembly extension (key 134) is centered
in the upper travel stop (key 83) hole.
10. Apply remote set point pressure equal to 50 per-
cent of the remote set point input range.
See figure 5–20. The adjustment arm of
the remote set point pivot assembly A
turns on a bushing at each end of the
shaft supporting the adjustment arm. In
the next step, position the shaft so both
bushings ''float'' inside the bearings
and do not rest against the end of either
bearing.
11. Connect the drive flexure (key 79) to the arm on
the replacement pivot assembly, making sure it stays
straight and vertical. Adjust the length of the pivot arm,
if necessary, until the flexure is vertical. Before tight-
ening the drive flexure screws, hold the pivot assembly
shaft in the middle of the bushing end play. Be sure
neither bushing is resting against the inside end of ei-
DRIVE FLEXURE
LOWER TRAVEL
STOP
UPPER TRAVEL
STOP
Note
5–31