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CONVERSION
MO953
JO CONVFRT A4 DFVICF-
RELAY ASSY 313695J
FEEDBACK SPRING
3 13696-00063
CUP 315178-00062
DIAPHRAGM 311750 OR
314153
CUP 31174O-OO602
Fig. 6. MO953 Conversion.
YOKE ASSEMBLY
YOKE
314651 (314651A)
316059 (316059A)
ASSEMBLY 316059A-FOR SUPPORT WITH
ASSEMBLY 314651A-FOR SUPPORT WITH
NYLON INSERT
Fig. 7. Yoke Assembly.
REPLACE MAIN DIAPHRAGM
GENERAL
Before replacing the diaphragm, determine the type and
material of the existing diaphragm according to its color:
Maximum temperature 160F (71C)
Used on MP953A, 6, and E
CONVFRT A8 DWICF-
- S C R E W
13 IN. (330 MM)
RELAY ASSY 313695J
FEEDBACK SPRING
CUP 315178-00062
DIAPHRAGM 312505
CUP 315020-00124
- D I A P H R A G M
SPRING
314652
3 1 4 6 5 3
Maximum temperature 250F (121C)
Used on MP953B, D and F
Maximum temperature 250F (12 1C)
Used on MP953A and C and may be installed on
Flat diaphragms and beaded-roll diaphragms are not
interchangeable. Neoprene and EPR diaphragms are
interchangeable but must meet maximum temperature
requirements.
Direct-acting Actuators are subject to extremely high
internal spring loads. Therefore, Actuator covers must be
removed very carefully before the the main diaphragm can
be replaced.
When using the following procedures, see Figures 8 and
10 for exploded diagrams and Tables 6 and 8 for parts.
REMOVE ACTUATOR COVER
A
WARNING
Use extreme caution when disassembling Actuators.
Actuator assemblies are under spring load which can reach
Disconnect all air lines, including any connected to
Gradutrol Relay or positive positioner, if present.
2.
Actuator cover by turning counterclockwise.
Remove exposed feedback spring.
3.
See WARNING in this section. Loosen cover
4.
setscrews sequentially l-1/2 turns each.
Check whether cover can be squeezed back to frame
5.
by hand. If so, continue sequentially loosening screws
until cover is free. Remove cover, diaphragm, and go
to REPLACE DIAPHRAGM.
If cover cannot be squeezed back to frame, use the
6.
following guides according to Actuator size.
NOTES:
a. Bolts should be threaded to within
approximately l/2 in. of their heads.
b. In each case, turn the long bolt in until its head
contacts the cover flange.
that are directly opposite each other. Replace
cover screws with l/4-20 x 3 in. bolts.
A
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