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REPAIR
GENERAL
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.
EQUIPMENT NEEDED
Tables 2 through 5 list basic repair tasks and the tools
required for each.
Table 2. Removing and Replacing Actuator Covers.
Model
5
8
13
All
7
Table 3. Removing and Replacing Actuator Bases.
De vice
Actuator
Model
Series Dia (In.)
5
2
2
1
1
bolts, threaded to within
-Four 5/16-18 x 3 in. hex-head
bolts, threaded to within
Tools Required
Torx bit
NOTE: Series number does not
indicate type of
fastener.
or T-25 Torx bit
NOTE: Series number does not
indicate type of
fastener.
Table 4. Loosening and Removing Actuator Bases from
Valve Bonnets.
Device
Actuator
Series Dia (In.)
Model
Table 5. Miscellaneous Tasks.
Task
Removing MP953A
Gradutrol Relay positioner
Removing MP953E positive
positioner
Removing hJP953B
Gradutrol Relay positioner
bracket assembly
Removing MP953F positive
positioner bracket assembly
Removing and replacing
diaphragm
Replacing feedback-spring
cup on MP953A, E main
diaphragm
Unlatching actuator from
valve stem button
Lubricating MP953A
Gradutrol Relay positioner
O-ring
Lubricating MP953E
positive positioner O-ring
Tools Required
or T-25 Torx bit
NOTE: Used only
1989 or later date
actuators regardless of date
umber does not
Tools Required
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.
Adjustable crescent wrench with
jaw opening to at least 2-5/8 in.
(67 mm).
(crescent wrench is acceptable
substitute)
Pliobond glue or equivalent
Medium- to large-blade
screwdriver
Lubricant or silicone grease
obtained locally
75-5500
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