crankshaft (7) riding in two roller bearings (6 and
12) mounted in the end plates (5 and 11).
Mechanical connection to the motor is made by
means of a gear keyed to the crankshaft and
meshed with the driving gear on the motor shaft.
The two gears are enclosed by the gear guard (6,
figure 3-3). Access to the oil reservoir within the
crankcase is obtained through the oil filler cap (9).
The crankcase can be drained by removing the
drain plug (8).
SERVICE AND OPERATIONAL
INSTRUCTIONS
Much of this information has been discussed
for the Model SC-5 transfer unit and need not be
repeated; however, where we note a difference,
we will discuss it.
adapters connected to the SC-5 pumping unit, we
are not implying that oil or grease can be used
in the adapters of Model SC-5.) In any case,
follow the manufacturer’s instructions. Do not
add to or subtract from anything in the manu-
facturer’s manual. Obviously, however, where the
Naval Air Systems Command (NAVAIRSYS-
COM) directives are concerned, they will take
precedence over the manufacturer’s instructions.
Walter Kidde instructions direct you to use a
10-inch wrench to tighten all hose-connecting
joints. While tightening the hose, you should be
careful not to twist them.
A strainer and strainer adapter are inserted
into the inlet line (at the supply cylinder) to the
pump. They prevent any dirt or metal filings that
may accumulate in the supply cylinder from
After you uncrate and inspect the unit, make
blowing over into the pump and impairing the
certain that the crosshead clears the packing nut.
action of the valves. Knowledge of the function
To do this, turn the master gear attached to the
of the strainer is important to you when you
crankshaft. The mechanism must work freely.
analyze the cause of malfunctioning pump valves
Fill the crankcase with a standard grade of
or other associated parts.
SAE #20 motor oil. CAUTION: Do not use any
oil or grease in the cylinders or in any of the
MAINTENANCE
adapters or hose connections used to convey
carbon dioxide. (Since this precaution was not
The normal maintenance on this pump is
specifically stated in the instructions for the
limited to proper lubrication. Figure 3-7 shows
Figure 3-7.—Lubrication points.
3-8
