Bird Technologies 8255 - Manual (Page 27)

Rear Seal
and Coolant
Before any disassembly of the rear of the load, if the cool-
ant has not already been drained from the tank, stand
the radiator on end with the connector pointed down.
1. Unscrew the four 10-32 screws at the corners of
the guard cover.
2. Unscrew the tube nut from the tank nozzle, us-
ing a small wrench if necessary, and pull the
nozzle free.
3. Loosen the clamp screw with a screwdriver from
the bottom of the V-band, same type as at the
front, and remove the V-band clamp.
4. Remove the rear cover which includes the at-
tached escape tube with captive nut, P/N
2430-088, and the diaphragm seal, P/N 2430-089.
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.
Maintenance
15