31
Model 580A Differential Pressure Switch
Section 4
Table 4.3 presents torque requirements for the switch assembly fasteners.
Table 4.3—Torque Requirements for Switch Assembly Fasteners
(See Figures 4.1 and 4.2 for part identification)
Item
Description
Part No.
Per
Unit
Torque*
9
Lock Screw
9A-C0580-1017C
2
Tight
10
Screw, B.H. Slotted, 3-48 x 3/16
Lg.
9A-C0117-0007J
6
Tight
12
Screw, B.H. Slotted, 8-32 x 3/16
Lg.
9A-C0117-1001J
2
Tight
16
Set Screw, 6-32 x 1/4 Lg.
9A-C0320-1010J
1
Snug
24
Terminal Strip Screw, 5-40 x 1/4
N/A
10
Snug
26
Movement Assembly Riser
9A-C0277-0035C
2
Tight
38
Screw, Cap: 10-32 x 1 Lg. (select one)
8
35-45 in-lb
Model 580A-0 (with glass lens)
Model 580A-2 (blind)
9A-C0220-1062J
9A-C0220-1031J
39
Screw, Rd. Hd., Slotted, 6-32 x
3/8 Lg.
9A-C0111-0015J
2
Tight
40
Screw, Pan. Hd., Slotted, 4-40
x 1/8 Lg. (Model 580A-0 only),
bottom hole in scale plate not used
9A-C0119-1116J
5
Snug
41
Screw, B.H., Slotted, 4-40 x 3/16
Lg. (Model 580A-0 only)
9A-C0117-0012J
1
Tight
42
Screw, B.H., Slotted, 6-32 x 3/16
Lg. (Model 580A-0 only)
9A-C0117-0013J
2
Tight
44
Screw, Hex Head, 1/4-28 x 1/2 Lg.
9A-C0116-1011J
4
8-9 ft-lb
46
Plug
9A-C0224-0269C
1
Snug
51
Nut, Hex., 3/8-16
9A-C0500-0039J
2
22-25 ft-lb
55
Screw, Rd. Hd., Slotted, 6-32 x
3/16 Lg.
9A-C0117-0013J
2
Tight
57
Screw, Flat Hd., 10-32 x 1/2 Lg.
9A-C0240-0015J
6
33-35 in-lb
* Snug denotes 1/16 (approx) turn past head contact.
Tight denotes 1/8 (approx) turn past head contact.