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Instruction Manual
June 2008
3. The feedback lever assembly (key 117, figure 28)
may need to be changed or altered depending on
actuator type and size. Refer to keys 117, 170, 171,
75, 76, 77, and 99 in the parts list. To change from
key 117 to 170, or vice versa, refer to the
Disassembling the Feedback Lever Assembly and
Assembling the Feedback Lever Assembly
maintenance procedures.
4. The cam (key 82, figure 28) may need to be
changed depending on actuator type and size. If the
cam is changed, two screws (key 83, figure 28) may
also be required and possibly a cam adjustment
indicator (key 84, figure 28). The cam adjustment
indicator is only used with the characterized cams B
or C. Refer to the Changing Cams procedure.
5. The range spring (key 150, figure 25) may need
to be changed depending on actuator type and size.
Refer to tables 8 through 11 for range spring
selection and hole position on the summing beam
assembly for coarse span adjustment.
6. A positioner adaptor may be required depending
on actuator type and size. Refer to key 113 in the
parts list. If the positioner adaptor is required, four
socket head screws (key 54, figure 28) will also be
required for mounting.
7. Changing from a 3610JP to a 3610J or a 3620JP
to a 3620J requires a pipe plug (key 78, figure 26) to
plug output A. Apply sealant (key 154) to the threads
of the pipe plugs.
Changing a 3610JP to a 3611JP Positioner,
Changing a 3620JP to a 3621JP Positioner,
or Vice Versa:
1. Change the feedback lever assembly (key 117
or 170, figure 28) as described in the Disassembling
the Feedback Lever Assembly and Assembling the
Feedback Lever Assembly maintenance procedures.
2. Changing from a 3610JP to a 3611JP or a
3620JP to a 3621JP requires the following feedback
parts: keys 172, 173, 174, 175, 184 (585 size 100
actuator only), and 185 [585 size 100 actuator with
51- through 102-mm (2- through 4-inch) travels only,
see figure 29].
3. Changing from a 3610JP to a 3611JP, or a
3620JP to a 3621JP requires installing a parallel
flexure (key 179, figure 25). The parallel flexure is
not used on positioners for 585 size 100 actuators.
Earlier 3611JP positioners do not have this part.
Therefore, the summing beam assembly (key 123,
figure 25) or relay beam assembly (key 122, figure
25) or both may be required if they are not drilled
and tapped to accept this parallel flexure. Refer to
figure 25 for the location of the required tapped
3610J and 3620J Positioners
holes. The following parts are required: keys 179,
180, and 181, figure 25.
4. Changing from a 3610JP to a 3611JP or a
3620JP to a 3621JP requires a positioner adaptor
(key 113, figure 29). Use four socket head screws
(key 54, figure 29) to mount the adaptor.
5. Changing from a 3611JP to a 3610JP or a
3621JP to a 3620JP requires the following feedback
parts: keys 38, 39, and 60, figure 28.
6. Changing from a 3611JP to a 3610JP or a
3621JP to a 3620JP requires a cam (key 82, figure
28). Two screws (key 83, figure 28) mount the cam
and a cam adjustment indicator (key 84,
figure 28—used only with characterized cams B or
C). Refer to the Mounting 3610J, 3610JP, 3620J,
and 3620JP Positioners procedures for correct cam
mounting.
7. Changing from a 3611JP to a 3610JP or a
3621JP to a 3620JP may require additional
feedback parts depending on actuator type and size.
Refer to keys 75, 76, 77, 99, and 171 in the parts list
and figure 28 to determine if they are required.
8. The range spring (key 150, figure 25) may need
to be changed depending on actuator type and size.
Refer to tables 8 through 11 for range spring
selection and hole position on the summing beam
assembly for coarse span adjustment.
9. The instrument gauge (key 80, figure 26) may
need to be changed depending on the input signal.
Apply sealant (key 154) to the threads of the gauge.
Changing a 3610J to a 3611JP Positioner,
Changing a 3620J to a 3621JP Positioner,
or Vice Versa:
1. Change the feedback lever assembly (key 117,
figure 28) by performing the Disassembling the
Nozzle Assembly and Assembling the Feedback
Lever Assembly maintenance procedures.
2. The nozzle (key 116, figure 25) must be changed.
Refer to the parts list for the correct nozzle assembly
part number. Refer to figure 7 to identify 3610J,
3620J, 3611JP, and 3621JP nozzles. Refer to the
Disassembling the Nozzle Assembly and
Assembling the Nozzle Assembly maintenance
procedures.
3. The supply and output gauges [keys 79 (not
shown) and 81, figure 26] must be changed and
possibly the instrument gauge (key 80, figure 26)
depending on the input signal. Apply sealant
(key 154) to the threads of the gauges.
4. Changing from a 3610J to a 3611JP or a 3620JP
to a 3621JP requires the following feedback parts:
keys 172, 173, 174, 175, 184 (585, size 100 actuator
39
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