TM 3-6665-209-35
1
Adapter
17
Terminal lug
33
Lockwasher
2
Cross
18
Screw
34
Screw
3
Nipple
19
Retaining ring
35
Flat washer
4
Calibrator plate
20
Retaining ring
36
Lockwasher
5
Diaphragm
21
Worm shaft
37
Screw
6
Screw
22
Spring
38
Elbow
7
Terminal lug
23
Flat washer
39
Nipple
8
Calibrator housing
24
Worm
40
Cross
9
Lockwasher
25
Stop shaft
41
Adapter
10
Screw
26
Setscrew
42
Elbow
11
Pipe to tube elbow
27
Worm shaft collar
43
Plug cock
12
Contactor needle bushing
28
Setscrew
44
Copper tube
13
Contactor insulator
29
Retaining ring
45
Plug cock
14
Grommet
30
Pin
46
Copper tube
15
Needle assembly
31
Screw
47
Elbow
16
Calibrator bracket
32
Lockwasher
48
Adapter
Figure 14-Continued.
(g) Disconnect the tube coupling nut
diaphragm. Too much air leakage causes the silver
that connects the copper tubing (57,
button of the diaphragm to touch the silver contact of the
needle assembly, thereby closing an electrical circuit.
(h) Disconnect the tube coupling nut
This circuit is referred to as diaphragm switch S1 on the
that connects the copper tube (14,
14) of the diaphragm switch S1 is on top of the calibrator
(i) Disconnect the tube coupling nut
housing (8) and the other terminal lug (17) is at the end
that connects the copper tube (39,
of the needle assembly (15). The two plug cocks (43
(j) Remove two screws (34) and
and 45) serve as a means to attach the water
lockwashers (33) that secure the
manometer to the calibrator assembly so that the
calibrator housing (8) to the chassis
vacuum or pressure balance on the two sides of the
base.
diaphragm may be checked.
( k ) Remove the calibrator assembly
b. Maintenance.
from the chassis base.
(1) Removal.
(2) Disassembly.
(a) Remove
four
screws
(37),
(a) Remove the chassis assembly (TM
lockwashers (36), and flat washers
3-6665-209-12).
(35) that secure the calibrator
(b) Remove the balance orifice holder
bracket (16) to the calibrator
housing (8). Remove the bracket
(c) Remove the screw (18, fig. 14) and
with the parts assembled to it.
remove the terminal lug (7) with its
(b) Loosen the setscrew (26) and
remove the worm shaft collar (27)
attached wire from the needle
from the worm shaft (21).
assembly (15).
(d) Remove the screw (6) and remove
Note
the terminal lug (7) with its attached
wire from the calibrator housing (8).
The setscrew (28) is used as a stop.
(e) Loosen the setscrew (35, fig. 3) and
Since it is secured with electrical
pull the knob (6) from the end of the
insulating compound (glyptal), do not
remove it unless it is loose or
worm shaft (21, fig. 14).
damaged.
(f) Loosen the shaft lock (37, fig. 3) and
remove the two drive screws (36)
(c) Use a nail set or punch and drive
which secure the shaft lock to the
the pin (30) from the worm (24) and
front panel (42). Remove the shaft
the worm shaft (21). Hold the worm
lock from the front panel.
and pull the worm shaft from the
worm and through its mounting
holes in the calibrator bracket.
AGO 8069A
37