Bird Technologies 8327-300 - Manual (Page 23)

2. Pull the connector straight out of its socket.
3. Insert the new connector into the mating connector. Be sure the
projecting center pin on the connector is properly engaged and seated
in the mating socket, then push it in firmly.
4. Install the four screws that were previously removed.
Coolant
The level of the dielectric coolant should remain constant in the unit after prolonged
usage under normal operating conditions. As shipped, the coolant is at a factory
determined level, and should be about 3-1/4 inches (82.5 mm) below the surface of
the thermoswitch hole, with the unit in a vertical position. However, loss of up to
10% of the full tank capacity should not impair the operating efficiency of the
attenuator. The coolant should be a light yellow color. If it is dark and not a light
yellow, it may be contaminated and should be replaced. Occasionally inspect around
the clamping band at the input end for possible coolant leakage. Tighten the clamping
screw if necessary, and make certain the O-Ring seal is in good condition; i.e., soft
and pliable and free from surface cracks.
Adding Coolant Add coolant through the pipe plug hole (thermoswitch hole) until it reaches the
proper level, about 3-1/4 inches below the surface of the hole. Do not overfill the
unit beyond the recommended level.
Replacing Coolant To replace all of the coolant use the following procedure:
1. Remove the rear (output) connector per the Disassembly paragraph.
2. Replace the vent plug with the shipping plug.
3. Carefully raise the unit by its front handle and foot until it is tipped
up on its back.
4. Position the load on the bench top so that the entire rear connector
assembly, minus the connector, projects over the edge of the bench.
Brace it vertically in this position so that it will not topple over.
5. Place a clean container for liquid just under the rear connector
assembly to receive the oil. The volume of the oil is 2.9 gallons (11
liters), so the container must be at least a three gallon size, and
preferably five gallons.
6. Remove the V-band clamp from around the front (input) connector
assembly by loosening the 10-32 holding screw sufficiently to slip the
band off.
7. Carefully work the RF section assembly loose and lift it straight out
of the resistor tank.
+
Note: There will be some initial resistance as the O-Ring seal around the rear
connector assembly comes loose from the housing.
As the RF section comes out of the rear connector assembly, the
coolant will start to pour into the container. Work the RF section
loose slowly, so that the coolant doesn’t splash coming out.
8. Let the coolant drip for a few minutes to get as much as possible out
of the radiator tank. As the RF section is raised out of the radiator
tank some coolant will be trapped in the rear end cylinder. Turn the
section over carefully to empty it out.
Maintenance
13