Instruction Manual
D102005X012
846 Transducer
June 2017
38
Replacing the Electronic Circuit Board
1. Verify that the circuit board is green for assembly into a direct action unit, or blue for assembly into a reverse action
unit.
2. Ensure that the two O‐rings are in the proper position. The small O‐ring is positioned in the beveled O‐ring gland of
the module subassembly. The sensor O-ring is positioned in the O-ring gland of the sensor. They should be lightly
lubricated with silicone grease.
3. Position the circuit board on the module subassembly. Ensure that the circuit board mounting holes match those
on the module subassembly. Place the three long screws in the mounting holes adjacent to the pressure sensor.
4. Place the two short screws in the remaining mounting holes. Tighten the three long screws first, then tighten the
remaining two screws.
Pilot/Actuator Assembly
WARNING
Refer to the Maintenance WARNINGS at the beginning of this section.
The pilot/actuator assembly is located at the bottom of the module final assembly, as shown in figure 15. It is a
unitized assembly consisting of the coil, magnet, and spring of the actuator, and the deflector and nozzles of the pilot
stage. Two O‐rings are part of the pilot/actuator assembly. Table 4 shows the O‐ring sizes. They are located in the
beveled O‐ring glands of the module subassembly, adjacent to the nozzles. The pilot/actuator assembly is held in place
by four mounting screws.
Action
A blue rubber diaphragm under the deflector bar and nozzle area identifies the direct action pilot/actuator assembly. A
red diaphragm under the nozzle area identifies the reverse action pilot/actuator assembly. Figure 19 shows the
bottom view of the pilot/actuator assembly.
Figure 19. Pilot/Actuator Assembly (Bottom View)
ALIGNMENT
KEY
RUBBER
DIAPHRAGM
MOUNTING
SCREWS
A6654
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