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Instruction Manual
June 2008
Assembling the Nozzle Assembly
Refer to figure 25 for key number locations while
assembling the nozzle assembly.
1. Thread the core and wire assembly (key 147)
back into the nozzle block (key 146) if previously
removed.
2. Apply a very light coat of lubricant (key 153) to
the nozzle O-rings (keys 120 and 121). The lubricant
must be applied very sparingly to avoid accidental
plugging of the nozzle primary orifice.
3. Assemble the nozzle (key 116) into the nozzle
block (key 146) with a gentle pushing and twisting
motion to avoid nicking the O-rings. To fully seat the
nozzle, align the flat at the nozzle base with the flat
cast into the underside of the nozzle block.
4. Apply a very sparing amount of lubricant
(key 153) to the two O-rings (key 64) and install
them into the positioner case (key 115A).
5. Place the nozzle block (key 146) on the
positioner case and tighten the two captive nozzle
block mounting screws (key 45).
6. Perform the Assembling the Summing Beam
Assembly procedure.
Assembling the Summing Beam
Assembly
Refer to figure 25 for key number locations while
assembling the summing beam.
1. Install the flapper (key 18) into the summing
beam assembly (key 123) with the flapper screw and
washer (keys 51 and 176) so that the letter A is
visible as shown in figure 25.
2. If the nozzle (key 116) has been removed,
perform the Assembling the Nozzle Assembly
procedure.
3. If the relay beam assembly (key 122) is removed,
perform steps 1 through 7 of the Assembling the
Relay Beam Assembly procedure.
4. Place the summing beam assembly (key 123) in
the positioner case (key 115A) and ensure the
summing beam assembly flexure is under the relay
beam (key 122) flexure.
5. Loosely install the two summing beam mounting
screws (key 124).
6. The summing beam assembly (key 123) must
simultaneously align with the relay beam assembly
(key 122) and diaphragm connector (key 135) as
follows:
3610J and 3620J Positioners
a. Depress the summing beam assembly
(key 123) until the flapper lightly touches the
nozzle, then slide the summing beam assembly
such that the hole for the machine screw
(key 140) is centered over the tapped hole in the
diaphragm connector (key 135).
b. While keeping the above hole centered, slide
the summing beam assembly such that the
summing beam assembly flexure is aligned with
the relay beam assembly flexure along its entire
length.
c. While maintaining the above orientations,
tighten the two mounting screws (key 124).
d. After tightening the mounting screws check
the alignments described in steps a and b and
repeat if necessary.
For optimum positioner performance, be sure the
summing beam assembly is aligned as described.
7. While holding the hex diaphragm connector
(key 135) with an open end wrench to prevent
rotation (rotation of the diaphragm connector may
damage the input diaphragms or twist them and
reduce positioner performance), install the machine
screw (key 140).
8. Install the counter spring (key 125), counter
spring seat (key 126), and counter spring screw
(127) and tighten. Ensure that the counter spring
seat does not rub against the summing beam
assembly (key 123) as the summing beam assembly
pivots.
9. If the zero adjustment spring seat (key 142), zero
spring bracket (key 144), and zero adjustment screw
(key 143) were previously disassembled, place a
light amount of lubricant (key 153) on the zero
adjustment screw threads for smooth zero
adjustment, insert the zero adjustment screw
through the zero spring bracket, and thread the zero
adjustment spring seat onto the zero adjustment
screw.
10. Place the zero spring (key 141) and zero spring
bracket (key 144) on the positioner input module and
ensure that the zero spring ends are centered on the
seats. Ensure that the tab on the zero adjustment
spring seat (key 142) is inserted in the anti-rotator
slot in the zero spring bracket. Insert the two
machine screws (key 139) through the zero spring
bracket, carefully compress the zero spring by
pushing down on the zero spring bracket, and
tighten the screws in the positioner case.
11. If the feedback lever assembly (key 117 or 170,
figure 28) was previously removed, perform the
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