REPAIR
Table 4. Loosening and Removing Actuator Bases from
Valve Bonnets.
GENERAL
Device
Actuator
Series Dia (In.)
Model
Tools Required
This section lists tools needed to disassemble and
reassemble Actuators and gives procedures for replacing
parts of actuators. See PARTS AND ACCESSORIES for
parts diagrams and lists.
MP953A
MP953c
MP953E
3/16-in hex
allen
wrench (bit)
or T-25 Torx bit
NOTE Series number does not
NOTE:Used only
1989
or later date
actuatorsregardlessof date
umber does not
Table 5. Miscellaneous Tasks.
EQUIPMENT NEEDED
Mp953c
MP953E
Tables 2 through 5 list basic repair tasks and the tools
required for each.
MP953A
MP953c
MP953E
Table 2. Removing and Replacing Actuator Covers.
Model
‘~
MP953A
MF953c
h4P953E
MP953B
MIY53D
MP953F
Au
5
1/4-h
hex socket
8
-
3/8-in
hex socket
-
Two l/4-20 x 3 in. hex-head
bolts, threaded to within
l/%-in.
of bolt head
13
-
3/8-in.
hex socket
-Four
5/16-18
x 3 in. hex-head
bolts, threaded to within
l/2-+1.
of bolt head
All
7
5/16-in.
hex socket
MP953B
MP953D
MP953F
Task
Tools Required
Removing
MP953A
Gradutrol Relay positioner
Crescent wrench with jaw
opening to at least
2-5/8
in. (67
mm). Narrow-jaw pipe wrench or
large adjustable pliers may be
substituted as long as they do not
distort
the setpoint knob.
Removing
MP953E
positive
positioner
Adjustable crescent wrench with
jaw opening to at least
2-5/8
in.
(67 mm).
Table 3. Removing and Replacing Actuator Bases.
5/16-in. hex socket
Removing
hJP953B
Gradutrol Relay positioner
bracket assembly
Removing
MP953F
positive
positioner bracket assembly
De vice
Actuator
Model
Series Dia (In.)
MP953A
2
5
MP953c 2
MP953E
1
Tools Required
5/16-in.
hex socket
5/16-in.
hex socket or T-25
Torx bit
NOTE: Series number does not
indicate type of
fastener.
Removing and replacing
MP953B,
D, F sleeve
diaphragm
-
Small-blade screwdriver
-3/16-m
hex socket
-
l-3/8-in. adjustable hex socket
(crescent wrench is acceptable
substitute)
9/16-m.,
six-point, deep socket
(3/8-in.
drive preferable)
3/8-in. hex
allen
wrench (bit)
3/16-m. hex
allen
wrench (bit)
3/16-in. hex
allen
wrench (bit)
or T-25 Torx bit
NOTE: Series number does not
indicate type of
fastener.
Pliobond glue or equivalent
Replacing feedback-spring
cup on
MP953A,
E main
diaphragm
Unlatching actuator from
valve stem button
Medium- to large-blade
screwdriver
MP953F 1
Lubricating
MP953A
Gradutrol Relay positioner
O-ring
Lubricant or silicone grease
obtained locally
Lubricating
MP953E
positive positionerO-ring
75-5500
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