Fluke Calibration 4322-SYS-NAVAIR, Service Manual

Page: 81 / 186

Controller Maintenance
Controller Part Replacement
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hbx078.eps
Figure 4-14. Coarse and Fine Filters
CPS Dock and NC Isolation Valve
Use the following instructions and reference Figure 4-15 and 4-16 to replace the CPS
dock assembly and/or the NC isolation valve.
1.
Use the instructions in “Chassis and Control Panel” on page 4-9 to remove the
chassis from the case. The control panel does not need to be removed for this
procedure.
2. Remove the pump bracket assembly from the chassis. See “Pump Bracket” on
page 4-14.
3. Remove the NC isolation valve as follows (see Figure 4-16):
a.
Remove the Communications Box. See “Communications Box” on page 4-24.
b. Remove the wire cover (with the EMI gasket) by removing the seven screws and
lock washers. This will free the solenoid valve wires.
c. With a soft grip pair of channel locks, turn the NC isolation valve (

)
counterclockwise to remove.
d. Remove the four screws (

) that attach base of the NC isolation valve to the
CPS dock.
e. Remove the valve body (

) from the CPS dock.