Bird Technologies 8630B Series User Manual

Page 38

Bird 8630B Series Moduload RF Load Resistor

Model 8638 and 8638B — unflanged, loosen one clamping band on

the load side of the connector sleeve. Refer to Figure 5.

3. Separate the transmission coaxial air line from the load connector.

Make sure the center conductor bullet remains in the transmission

line.

To remove the load resistor unit take off the top panel by removing
the 18 screws around its perimeter. Lift off the top panel assembly by
the handles. Continue following these instructions:

1. Remove, and retain the drain plug located near the bottom of the

rear panel of the unit and allow the coolant to drain.

Note: Do not replace the drain plug with any substitute plug, use

the plug removed.

2. Unscrew the hose clamps on the hoses leading to the input elbow of

the flow switch and the output elbow on the water chamber. Use

an ordinary screwdriver.

3. Remove the hoses.
4. On the 8630, loosen the hex collar on the flow switch assembly and

remove the collar and sensor from the flow switch body. On the

8630B, disconnect the flow switch wires at their in-line connectors.

The output elbow on the side of the water chamber can now be

removed by unscrewing counterclockwise.

5. Remove the six 1/4-20 x 5/8 hex head bolts (on the inside of the

front panel) securing the load to the front panel.

Note: When the six bolts securing the load to the front panel are
removed the outer conductor assembly will be disconnected. Hold this
assembly to keep it from falling and being damaged.

6. Temporarily reattach the outer conductor to the load body. Use

two or three of the 1/4-20 bolts (finger tight) for this purpose.

7. Tip up the the unit at the back enough to unscrew the flow switch

counterclockwise. The input elbow on the water chamber can be

taken off after the load is removed through the front panel.

8. If the load resistor is to be returned to the factory for repair, store

components with the Moduload unit until further use. Consult the

factory. If the unit is to be field repaired, proceed with resistor

replacement instructions as described in the Internal Repair of the

Load Resistor section.

9. Replace the load resistor by reversal of the above procedure. Be

sure to replace the coolant, per the coolant section. Check for leaks,

especially at the restored connections.