4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-44
Replacing the Loader Valve Plug and
Valve Plug Spring
WARNING
Refer to the Maintenance WARNING
on page 6-1.
Refer to figure 7-7 for key number location.
1. Remove the controller assembly from the case
by performing steps 1 through 3 of the case and
cover replacement procedure.
2. Loosen the spring seat screw (key 275).
3. Remove the valve plug spring (key 276) and the
valve plug (key 277).
4. Inspect the parts and replace as necessary.
5. Install the valve plug spring and valve plug.
6. Tighten the spring seat screw.
7. Temporarily apply supply pressure and process
pressure and check for leaks.
8. 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.
9. Mount the controller as described in the
Installation section.
10. Connect the external piping to the controller.
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