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Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices | Next
Compressor Assembly, Model 4211 Carbon Dioxide Transfer Unit |
Too much grease may cause excessive bearing
temperature and cause the grease to leak out of
the housing to the windings.
Piston Rod Packing
Piston rod packing should be replaced once
every 2 years.
To replace the piston rod packing, use the
following steps:
1. Remove the six bolts on top of the cylinder
head. Remove the cylinder head.
2. Loosen the hex nut (figure 3-2) at the
bottom of the piston rod.
3. Remove the three bolts that hold the
cylinder body to the crosshead guide unit.
4. Raise the cylinder body and unscrew the
piston rod from the crosshead so that it clears the
base.
5. The piston rod packing is now in a
position to be replaced. Remove the locknut from
the piston rod and then remove the piston rod
packing nut.
6. When you replace the flanged-type pack-
ing, remember that the packing nut serves only
to hold the packing in place. Tightening the nut
excessively will not increase its efficiency; the
packing nut should not be forced down tight
enough to damage the packing flange.
7. After you replace the packing and packing
nut, mount the cylinder body on the crosshead
guide. Make certain that the locknut is replaced
on the piston rod before you screw it into the
crosshead.
8. Screw the piston rod into the crosshead
until the top edge of the piston packing is flush
with the top of the cylinder body, with the
crosshead in the uppermost position (figure 3-2).
To check this adjustment, rock the crank back
and forth; then tighten the locknut at the bottom
of the piston rod.
9. Replace the piston head and tighten all the
mounting bolts.
WALTER KIDDE TRANSFER UNIT
The Walter Kidde unit, like the SC-5
is
designed and manufactured expressly for the
purpose of transferring carbon dioxide in its
liquid form from one cylinder to another. The unit
is supplied complete with the necessary adapters,
recharging valves, safety discs and bushings, nuts,
bolts, and washers needed to make connections
to the cylinders and minor adjustments to the unit.
Pump Models 4211 and 4211-1 are driven by a
three-fourths horsepower motor and are equipped
with a safety switch and lead fitted with a plug.
Three-prong plugs and three-wire leads should be
substituted for the ordinary two-wire and two-
prong arrangement. Pump Models 4306 and
4306-1 are driven by a single-cylinder, four-cycle,
three-fourths horsepower, air-cooled engine.
Figure 3-3 illustrates the Walter Kidde electric
recharge unit, Model 4211.
COMPONENTS
The carbon dioxide transfer unit (figure 3-3)
consists of the following major components:
compressor assembly (5), running gear assembly
Figure 3-3.—Walter Kidde Electric CO2 Transfer Unit,
Model 4211.
3-5
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