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90°Max
Piston
Cylinder
Figure 1-47. Actuator in the fully extended
position
6. If variable restrictors are present, remove
their mounting hardware in the following
order: two Torx T-20 screws, hex nut, and
mounting bracket for each restrictor valve.
Released: April 2004
7. Remove the two Torx T-20 screws securing
NOTE: If valve/actuator alignment is to be made,
see Valve/Actuator Alignment in this section.
Piston rod
8. To reassemble: Align the two mounting holes
(extended
position)
9. Secure the valve box top assembly with two
10. Exercise the valve(s) on and off a few times
6850 Series Gas Chromatograph Service Procedures
the valve box top assembly to the standoffs.
Lift the valve box top assembly straight off
the valve box. Be careful not to move the
valve rotor index pin from its "at rest" posi-
tion.
in the valve box top assembly with the stand-
offs in the valve box. Lower the box top
assembly until it rests on the standoffs.
Torx T-20 mounting screws. Tighten these
screws firmly. Reinstall hardware for vari-
able restrictors if present.
to verify operation.
127
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