Replacing Remote Set Point Assembly Parts; Replacing Pivot Assembly A (Key 114) - Fisher 4194B Series Instruction Manual

4194A, B, and C Series
PIVOT
ASSEMBLY A
36A9751-C
B1668-4 / IL
CAUTION
In the following step, do not lift out the
remote set point assembly by holding
the capsular element or linkages. These
parts may be damaged.
6. Lift out the remote set point assembly by holding
the tie bar (key 106), mounting plate (key 111), travel
stop (key 83), or pedestal assembly (key 105).
7. Align the replacement assembly with the mounting
screw holes. Replace the mounting screws.
8. Reconnect the remote set point pressure connec-
tion union (key 93). Apply full remote set point pres-
sure and check for leaks.
9. Connect link B (key 126) to the connecting hole on
the set point indicator.
10. Replace the supply pressure gauge.
5–26
GUIDE
FLEXURE
TIE BAR
REMOTE SET POINT ZERO ADJUSTMENT SCREW
ZERO ADJUSTMENT LOCKING SCREW
Figure 5-20. Remote Set Point (suffix letter M) Parts and Adjustment Locations
MOUNTING
SCREW
ADJUSTMENT
LINK A
SCREW
LINK B
LINEARITY
ADJUSTMENT
PIVOT
ASSEMBLY B
MOUNTING
SCREW
11. Perform the remote set point maintenance calibra-
tion procedures. Perform the appropriate process indi-
cator zero and span calibration and flapper alignment
procedure in section 3 or 4.
Replacing Remote Set Point Assembly
Parts
Figure 5-20 shows the parts and adjustment locations.
Refer to figure 5-26 for key number locations.

Replacing Pivot Assembly A (Key 114)

1. Decrease the remote set point pressure to 0 psig.
2. Remove two screws (key 103) and remove the tie
bar (key 106).
3. Note where link A is connected. Disconnect link A
(key 116) from the lever arm on pivot assembly A (key
114).
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.
DRIVE FLEXURE
LOWER TRAVEL
STOP
UPPER TRAVEL
STOP
CAPSULES