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Uneven tightening could damage the
tubing assembly.
10. Position the auto/manual station as far down on
the frame and toward the scale as possible. Carefully
tighten the two screws (keys 314 and 315) so that the
auto/manual station contacts the three pads on the
tubing assembly.
11. Carefully tighten the remaining screws and nuts.
12. Plug the controller output connection and apply
supply pressure to the controller. Check for leaks.
13. Position the controller assembly in the case and
start, but do not tighten the nine mounting screws.
Slide the controller assembly down to assure an O-
ring seal at the pressure connections along the bottom
of the case. Hold the controller assembly in place
while tightening the nine mounting screws.
14. Perform the appropriate calibration procedure in
section 3 or 4.
Replacing the Switch Body Assembly,
Lever O-Ring, Switch Body O-Ring and
the Tubing Assembly
Refer to figure 5-27 for key number location.
Disassembly
1. Remove the auto/manual station from the controller
as described in steps 1 through 4 of the Replacing the
Auto/Manual Station Procedure.
2. Loosen the two screws (key 288), and remove the
lever cover plate (key 305).
CAUTION
The lever spring (key 302) is under pre-
load. Take care not to lose any parts
during disassembly.
3. Using a 1/16-inch (1.5 mm) punch, push the groove
pin (key 303) out toward the surface of the lever cover
plate.
4. Remove the switch lever (key 304), lever spring
(key 302), and lever spring seat (key 301).
5. Remove the tubing assembly (key 309).
CAUTION
The switch body springs (key 295) are
under preload. Take care not to lose any
parts when separating the switch body
assembly from the loader assembly.
4194A, B, and C Series
6. Loosen the two screws (key 290), and separate the
switch body assembly (key 291) from the loader as-
sembly (key 282).
7. Remove the O-rings (keys 292, 293, and 294),
switch body springs (key 295), and balls (key 296).
8. Loosen two screws (key 308), and remove the
closing plate (key 307) and the closing plate gasket
(key 306).
9. Pull the clip (key 300) from its engagement with the
shaft of the lever assembly (key 297).
10. Pull the lever assembly from the switch body as-
sembly (key 291) and rocker (key 299).
11. Remove the O-ring (key 298).
12. Inspect the O-rings and gaskets for damage or
wear; replace if necessary.
Assembly
13. Insert the lever assembly (key 297) into the switch
body assembly (key 291) and hold the rocker (key
299) with the flats on the lever assembly shaft.
14. Insert the clip (key 300) in the groove of the lever
assembly shaft to hold the lever assembly (key 297) in
the switch body assembly (key 291).
15. Position the closing plate gasket (key 306) and
the closing plate (key 307). Secure with two screws
(key 308).
After assembly in step 15, be sure the
side of the closing plate marked OUT is
visible.
16. Place the balls (key 296), switch body springs
(key 295), and O-rings (keys 292, 293, and 294) in the
switch body assembly (key 291).
In the following step, the ends of the
springs must be in the counterbored
spring seats before compression.
17. Compress the switch body springs with the loader
assembly (key 282), and bolt the switch body assem-
bly (key 291) to the loader assembly using the two
screws (key 290).
18. Reconnect the tubing assembly (key 309).
19. Locate the lever spring (key 302) and the spring
seat (key 301) on the switch lever (key 304), and posi-
tion these parts in the opening of the loader assembly
(key 282).
20. Push the switch lever down, using the lever spring
seat (key 301) and the lever assembly (key 297) to
preload the spring. Make sure the notch of the switch
lever engages the pin of the lever assembly.
Note
Note
5–31
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