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Instruction Manual
June 2008
1. Loosen the socket head screw (key 55) and
remove the flexure adjustment (key 156) by carefully
sliding it off the end of the two flexures (on earlier
positioners, a stick-on label will have to be removed
from the top flexure prior to removing the flexure
adjustment). For 3611JP or 3621JP positioners only,
remove the two socket head screws and lock
washers (keys 180 and 181) and the parallel flexure
(key 179) (not used on positioners for 585 size 100
actuators).
2. Unscrew the 12 machine screws (key 47) and lift
the relay manifold (key 9) and relay beam assembly
(key 122) from the positioner.
3. Remove the relay nozzle diaphragm assembly
(key 8) and relay supply diaphragm assembly (key
7). Inspect them for wear and replace if necessary.
4. Unscrew the two screws (key 50) that hold the
nozzle relay head (key 14) and the supply relay
head (key 15), and separate them from the relay
beam assembly (key 122).
5. Loosen the two set screws (key 57) in the relay
manifold (key 9) and remove the pivot pin (key 10)
and relay beam assembly (key 122) from the relay
manifold.
6. Turn the positioner over and remove the two
body plugs (key 115E) and body plug gaskets (key
115F). The valve plug springs (key 115H), valve plug
shrouds (key 115K), and valve plugs (key 115G) are
now exposed and can also be removed. Inspect the
valve plugs for wear and replace if necessary.
Inspect the body plug gaskets (key 115F) and
replace if necessary.
7. Unscrew the 10 machine screws (key 115J), and
remove the pressure plate (key 115C) and gasket
(key 115D). Inspect the pressure plate gasket and
replace if necessary.
Disassembling the Summing Beam
Assembly
During the following summing beam disassembly
procedures, refer to figure 25 for key number
locations.
1. Loosen the socket head screw (key 55) and
remove the flexure adjustment (key 156) by carefully
sliding it off the end of the two flexures (on earlier
positioners, a stick-on label will have to be removed
from the top flexure prior to removing the flexure
adjustment). For 3611JP or 3621JP positioners only,
remove the two socket head screws and lock
washers (keys 180 and 181) and the parallel flexure
(key 179) (not used on positioners for 585 size 100
actuators).
3610J and 3620J Positioners
Early 3611JP positioners do not have
the parallel flexure described in step 1.
The parallel flexure should be added if
absent. This may require a new
summing beam assembly (key 123)
and relay beam assembly (key 122) if
these parts are not drilled and tapped
to accept the parallel flexure. See
figure 25 for the location of the parallel
flexure mounting screws.
2. Remove the range spring (key 150).
3. Relieve the tension on the zero spring (key 141)
by rotating the zero adjustment screw (key 143) fully
clockwise. Remove the two screws (key 139) which
retain the zero spring bracket (key 144). Remove the
zero spring bracket, the zero adjustment screw, and
the spring seat (key 142). Remove the spring seat
from the zero adjustment screw by rotating the
screw counterclockwise.
4. Unscrew the counter spring screw (key 127), and
remove the counter spring seat (key 126) and the
counter spring (key 125).
CAUTION
Rotation of the diaphragm connector
will damage the input diaphragms.
5. Remove the machine screw (key 140) while
holding the hex diaphragm connector (key 135) with
an open end wrench to prevent rotation.
6. Remove the two summing beam mounting
screws (key 124). Lift the summing beam assembly
(key 123) from the positioner case.
7. Remove the flapper (key 18) from the summing
beam assembly by removing the flapper screw and
washer (keys 51 and 176).
Disassembling the Nozzle Assembly
During the following nozzle assembly disassembly
procedures, refer to figure 25 for key number
locations.
1. Perform steps 1 through 5 of the Disassembling
the Summing Beam Assembly procedure.
2. Unscrew the two captive machine screws
(key 45) in the nozzle block (key 146) and remove
the nozzle block. Inspect the two O-rings (key 64)
and replace them if necessary. Apply lubricant
(key 153) to the O-rings before replacement.
Note
33
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