Bird Technologies 8251D208 - Manual (Page 27)

5. Inspect the diaphragm seal and replace it if it is
not soft and pliable, or shows signs of surface
cracks.
6. Replace the coolant if it appears contaminated,
i.e., if it is not clear.
The expansion tank is vented through the vent plug, P/N
2450-094. The unit unscrews from a socket on top of the
tank, but is not itself subject to disassembly.
The shipping plug is sealed by compression of an O-Ring,
P/N 5-504, which should be included when replacing the
vent plug.
RF Load
Resistor
Assembly
CAUTION
Do not leave out the O-Ring seal, P/N 5-504 when
interchanging the vent and shipping plugs.
1. Replace the vent plug with the shipping plug in
the fill hole of the expansion tank to prevent
coolant loss. Refer to figures 1 and 2 for plug
identification.
2. Stand the unit on its back end, i.e., vertically
with the RF connector up. Brace the unit in this
position to prevent it from tipping over.
3. Loosen the 10-32 x 1-1/2 inch screw on the
clamping band until the band is free. Remove the
band.
4. Grasp the RF connector and slowly lift the load
resistor assembly out of the radiator tank to al-
low the excess coolant to drip back in.
5. Before replacing the load assembly check the O-
Ring seal to be sure it is properly placed and is
in good condition. It should be free of twists and
positioned evenly around the beveled flange of
the resistor housing. Also, it should still be soft
and pliable and not hard or showing signs of sur-
face cracks.
Radiator
Handle
The radiator handle slides on and is held in place by the two
retaining studs that are riveted to the fins. It may be re-
moved or replaced as follows:
15
Maintenance