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3710 and 3720 Positioners
Key
Description
(1)
24
Shoulder screw (metric), S18800 (18-8 SST)
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.
Please consult your Fisher sales office or
representative.
25
Needle bearing, S18800 (18-8 SST)
(1)
26
Washer (metric), S18800 (18-8 SST)
(1)
27
Retaining ring (e-clip) (metric)
S18800 (18-8 SST)
28
Action block, A03600 (aluminum)
29*
Action block gasket
Neoprene
Synthetic rubber
30*
Input module assy
Includes summing beam assy and flexure
Nitrile
Synthetic rubber
31*
O-ring
For use between input module assy and
positioner base plate
Nitrile
Synthetic rubber
32
Zero adjustment pivot, S30300 (303 SST)
(1)
33
Washer (metric), S18800 (18-8 SST)
For zero adjustment pivot
(1)
34
Retaining ring (E-clip) (metric)
S18800 (18-8 SST)
For zero adjustment pivot
Two zero adjusters (key 35) are required: one for
the zero adjustment locknut and one for the zero
adjustment knob.
35
Zero adjuster, SST/plastic (2 req'd)
36*
Cam, S18800 (18-8 SST)
Rotary Valves
Sliding-Stem Valves
(1)
37
Cam locknut (hex/metric),
S18800 (18-8 SST)
38
Feedback shaft (cam shaft),
S30300 (303 SST)
(1)
39
Washer (metric), S18800 (18-8 SST)
For feedback shaft (cam shaft) (key 38)
(1)
40
Retaining ring (e-clip) (metric)
S18800 (18-8 SST), for feedback shaft
(cam shaft) (key 38)
42
Part Number
12B7298X012
Note
12B7271X012
12B7299X012
12B7300X012
32B7261X012
32B7262X012
32B7262X032
32B7280X012
32B7280X022
12B7292X012
12B7292X032
22B7301X012
12B7317X012
12B7318X012
Note
22B7302X012
32B7303X012
34B4169X012
12B7296X012
32B7305X012
12B7315X012
12B7316X012
Key
Description
41
Vent screen, S18800 (18-8 SST)
To attach a gauge or tire valve to the positioner or
converter, use a pipe nipple (key 68) and a street tee
(key 56).
53*
Supply gauge, plastic case,
W/chrome-plated brass connection
(requires street tee, key 56)
0 to 30 psig/0 to 0.2 MPa/0 to 2 bar
0 to 60 psig/0 to 0.4 MPa/0 to 4 bar
0 to 160 psig/0 to 1.1 MPa/0 to 11 bar
54*
Instrument gauge, plastic case,
W/chrome-plated brass connection
(requires street tee, key 56)
0 to 30 psig/0 to 0.2 MPa/0 to 2 bar
0 to 60 psig/0 to 0.4 MPa/0 to 4 bar
55*
Output gauge, plastic case
W/chrome-plated brass connection
(requires street tee, key 56)
0 to 30 psig/0 to 0.2 MPa/0 to 2 bar
0 to 60 psig/0 to 0.4 MPa/0 to 4 bar
0 to 160 psig/0 to 1.1 MPa/0 to 11 bar
(single action)
0 to 160 psig/0 to 1.1 MPa/0 to 11 bar
(double action) (2 req'd)
56
Street tee, qty 1, required to attach each
gauge or tire valve to pipe bushing (key 68)
Steel, carbon steel, zn pl
SST, S31600 (316 SST)
57
Pipe plug, for single-acting positioners only
alloy steel, pl
SST
Double action (2 req'd)
62
Tire valve
Single action
63
Sealant, silicone (not furnished with positioner)
64
Anti-seize (not furnished with positioner)
65
Lubricant, 20W/50 Motor Oil or equivalent
(not furnished with positioner)
66
PTFE, Petroleum based lubricant
(not furnished with positioner)
68
Pipe bushing, qty 1, required to attach each
pipe tee (key 56) to positioner connection
Steel, carbon steel, pl
SST, S31600 (316 SST)
69
Spacer, installed between the feedback
shaft (key 38) and the positioner base plate
plastic
(1)
70
Screw (metric), slot-head/cross-recessed
Used to secure key 18, supply cover, to key 16,
base ass'y S18800 (18-8 SST) (2 req'd)
*Recommended spare parts
1. Also recommended as a spare part if metric
fasteners are not available at the installation site.
Instruction Manual
Form 5300
July 2005
Part Number
12B7321X012
Note
11B4040X012
11B4040X022
11B4040X032
11B4040X012
11B4040X022
11B4040X012
11B4040X022
11B4040X032
11B4040X032
1P312321992
1P506938982
1C333528992
1A767535072
1H447099022
1H447099022
1E253726232
1E2537K0012
13B8202X012
13B9626X012
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