Assembling The Nozzle Assembly; Assembling The Summing Beam Assembly - Emerson Fisher 3610J Instruction Manual

3610J and 3620J Positioners
September 2017

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:
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
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Instruction Manual
D200149X012