Bird Technologies 6730B Series - Manual (Page 28)

2. Loosen the clamp screw until the clamping band
is released.
3. Hold the load assembly by the RF connector and
pull the assembly slowly out of the radiator tank
allowing the excess coolant to drain back into the
radiator.
4. Inspect the O-Ring seal which is located just in-
side the mounting flange of the radiator assem-
bly. Do not reuse the O-Ring if it is no longer
soft and pliable or shows signs of surface cracks.
5. Replace it with P/N 5-230 for Model 6732B and
P/N 8110-039 for Models 6734B, 6734B-030,
6737A and 6737-030A.
Model 6735-300A;
1. Place the unit on its back, connector up, by lift-
ing the radiator front. Do it carefully keeping the
topside always facing up. The vent hole is so po-
sitioned on the topside that when the unit is up-
ended in this manner, the coolant level will
remain just below the vent hole and not spill out.
2. Loosen the 10-32 x 1-1/2 inch screw on the
clamping band.
3. Remove the clamping band and lift the load re-
sistor assembly out of the tank. Allow the excess
coolant to drip back into the tank before laying
the assembly aside.
4. At ambient room temperature, the coolant level
should be 4-3/4 inch (120 mm) below the top sur-
face of the load resistor assembly mounting ring.
The tank is factory filled to this level with 2.9
gallons (11 liter) of a specially selected dielectric
fluid (P/N 5-030). The level of the fluid should re-
main constant, even after prolonged usage, under
normal operating conditions.
5. Inspect the O-Ring seal. It should be free of
twists and positioned evenly all around the bev-
eled flange of the resistor housing. The O-Ring
should be soft and pliable and show no signs of
surface cracks. If it has deteriorated, replace it
with P/N 8110-039.
Bird Model 6730B Series Termaline Wattmeter
20