Bird Technologies 8630B Series - Manual (Page 44)

Bird 8630B Series Moduload RF Load Resistor
28
Load Resistor Internal Repair
The entire load resistor unit need not be removed from the Moduload
unit as a piece. It is simpler to disassemble it in place by the following
procedure. While following these instructions refer to Figure 9.
1. Drain coolant from the equipment by unscrewing the drain plug
from the lower back face of the equipment.
2. Remove the top panel of the unit. Unscrew the 18, 8-32 x 1/4"
phillips head screws and remove the coolant filler plug. Lift the lid
off by its handles.
3. Use a 5/64" hex wrench to remove the 8-32 x 1/8" socket set screw
on the circumference of the water chamber assembly near the load
housing seam.
4. Use a 7/16" end-wrench to unscrew the six 1/4-20 x 5/8" flange
mounting screws from the inside of the front panel. Take the
screws out to release the exterior flanges.
5. Use a leather strap type pipe wrench, or by twisting the housing
flange on the outside of the front panel, turn the housing
counterclockwise while firmly holding the water chamber and flow
switch at the back. A little extra torque will break the initial screw
compression, and the housing should screw off easily. Unscrew the
housing until the threads are disengaged and pull it out of the
front panel.
6. Temporarily reattach the outer conductor assembly to the load
housing to prevent displacement of the center conductor assembly.
Use two 1/4 -20 mounting screws placed through diametrically
opposite flange holes, fastened finger tight.
7. The Load Resistor is ready to be repaired.
Resistor Removal The removal of the resistor is to be done with the unit in a vertical
position, connector end down.
1. The water chamber complex, of the load resistor assembly, and
flow switch, with the attached adapters, may be dismounted, but
it is not required or recommended. Do this only by unscrewing the
wired sensor plug of the flow switch, with a 1-1/2 end-wrench. Do
not disconnect the wiring. Follow the instructions provided earlier
in this chapter for the entire load removal.
2. The O-Ring inlet seal in the water chamber may be removed and
replaced if necessary.
3. Remove the retainer sleeve and O-Ring sleeve backup. The inner
flow tube may be removed.