King nutronics 3666-12-101 - 1.3 Overhaul Procedures; 1.3.1 Valve Disassembly Procedure

1.3 OVERHAUL PROCEDURES
NOTE: In the following instrucons, the numbers in parentheses refer to the parts shown in Figure 1.
CAUTION
Do not break the Stroke Adjustment Seal or loosen the Stroke Adjustment Assembly on the
Solenoid Coil Assembly. This adjustment is set at the factory and should not require readjustment.
1.3.1 VALVE DISASSEMBLY PROCEDURE
To disassemble the King Nutronics Corporaon PN 3666-12-101 Control Valve, do the following:
1. Remove the control unit chassis assembly from the case. Place the chassis assembly on the workbench, or other
suitable work surface, with the Main PCB assembly facing upward.
2. Main PCB assembly is hinged on one side. Remove the screws and washers securing the other side of the Main
PCB assembly to the chassis, then swing the PCB assembly aside on its hinges to access the inside of the chassis.
Set the screws and washers aside.
3. Disconnect the Control Valve wiring harness from its connector on the exible circuit assembly. This connector is
located on the side of the chassis assembly.
4. Disconnect the three tubing assemblies from the Control Valve using an appropriate wrench.
5. Remove the two screws and washers securing the control valve to the chassis assembly and set aside.
6. Remove the control valve assembly and rubber pad from the chassis.
NOTE: The orientaon of the Control Valve should be noted to ensure that the input and output ports are posioned
correctly when the valve is reinstalled. The input port is idened by the word “IN” stamped on the valve body. The
output port has the word “OUT” stamped on the valve body.
7. Place the Control Valve Assembly in a vise with the faulty Solenoid Coil Assembly (1) facing upward.
8. Remove the Safety Wire from the Gland Nut (2).
9. Loosen the Gland Nut (2) using an appropriate wrench, then remove the Solenoid Coil Assembly (1).
10. Remove the O-ring packing (12) from the Valve Seat Assembly (11). Discard the O-ring packing.
11. Remove the Valve Seat Assembly (11) by pulling straight up unl it is free of the valve body.
12. Remove the O-ring packing (9) from the Valve Seat Assembly or the cavity in the valve body. Discard the O-ring
packing.
13. Remove the O-ring packing (10) from the Valve Seat Assembly. Discard the O-ring packing.
14. Using tweezers, remove the Ball (8) from the Ball Guide (6) cavity. Discard the Ball.
15. Remove the Ball Spring (7) from the Ball Guide (6). Discard the Ball Spring.
16. Clean all parts with isopropyl alcohol, then blow dry with compressed air. The Control Valve is now ready for over-
haul and reassembly.
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