Instruction Manual
D101728X012
3710 and 3720 Positioners
September 2017
45
Positioner Common Parts (refer to
figure 31)
Key
Description
1*
Spool Valve Ass'y, 6 mm
2*
O‐ring, used between spool valve and
action block (3 req'd)
3
Screw (metric), slot‐head/cross‐recessed,
For attaching action block to
positioner base plate (4 req'd)
For attaching spool valve to
action block (2 req'd)
For attaching input module to
positioner base plate (4 req'd)
Note
To identify the span adjuster ass'y for 0.4 to 2.0 bar (6 to 30 psig) input
range, red color coding appears on the range spring.
4
Span adjuster ass'y
0.2 to 1.0 bar (3 to 15 psig) (no color‐coding)
0.4 to 2.0 bar (6 to 30 psig) (color‐coded red)
5
Nameplate, positioner
6
Screw, self‐tapping, pan head, slotted,
for positioner nameplate (2 req'd)
7
Cover ass'y, includes screws (key 8) and
O‐rings (key 7B)
7B* O‐ring, used to hold positioner
cover screws (4 req'd)
8
Screw (metric), slot‐head/cross‐recessed,
For indicator cover (4 req'd)
For positioner cover (captive) (4 req'd)
9
Hex nut (4 req'd)
For indicator cover screws (key 8)
10
Beacon indicator
11
Extension feedback shaft, for use with
beacon indicator
12
Retaining ring (E‐clip) (metric)
Used to secure the indicator.
For standard indicator, use inside the
positioner cover
For beacon indicator, use outside the
positioner cover
Key
Description
Note
Key 13, pointer, is used with key 15, indicator. Key 13, pointer, fits over
the molded slot in the center of key 15 and rests in appropriate quadrant
recess in the surface of key 15.
13
Pointer
14
Indicator scale
Note
Key 15, indicator, features a molded slot to facilitate adjustment of the
indicator during installation of the positioner cover.
15
Indicator w/molded screwdriver slot,
w/O‐ring (key 15A)
Note
Key 16, base ass'y, includes key 38, feedback shaft, and key 17, flanged
bearing (qty 2) only. Key 16 does not include key 18, supply cover, key
19, O‐ring, and key 70, screw (qty 2).
16
Base assy
17*
Flanged bearing
For feedback shaft (key 38) (2 req'd)
18
Supply cover
19
O‐ring, used under the supply cover (key 18)
21
Feedback arm assy
Includes needle bearing (key 25)
pressed into the feedback arm
22*
Flanged bearing
For feedback pivot
23*
Cam roller (ball bearing, metric)
The bearing is used as the cam roller,
attached to the feedback arm ass'y (key 21)
by the shoulder screw (key 24)
24
Shoulder screw (metric)
Note
The needle bearing (key 25) is pressed into the feedback arm (key 21).
To install a new needle bearing, the existing bearing must be pressed
out. Consult your
25
Needle bearing
26
Washer (metric)
27
Retaining ring (e‐clip) (metric)
*Recommended spare parts
1. Also recommended as a spare if metric
fasteners are not available at the installation site.
