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 1. Cylinder
4. Capscrews
2. Rotor
5. Bucket spring
3. Head
6. Bucket
Figure 5-96. Rotary hand pump (typical).
(2)
Lift head (3) from cylinder (1).
NOTE
(3)
Compress spring (5) and withdraw from rotor
If pump is hard to turn after new buckets are
(2).
installed, remove the head and apply a small
(4) Lift buckets (6) out of rotor.
amount of fine lapping compound to sides
d. Cleaning, Inspection, and Repair.
of buckets.
Install head and install
(1) Inspect sides of buckets (6) for wear. In order
capscrews lightly. Turn crank a few turns
to prime and pump efficiently, the buckets, when revolving
(until pump turns freely), then tighten
should fit snugly between head and cylinder.
capscrews a little and turn pump again.
(2) If buckets are worn, with no signs of wear on
Repeat until pump turns freely with
head or cylinder, replace the buckets.
capscrews tight. Then, disassemble pump,
(3) Inspect sides of head and cylinder for wear.
wash out the lapping compound, and
When worn, replace the pump.
reassemble.
e. Reassembly. Assemble by reversing the procedure of
f. Installation. Install by reversing the procedure in b.
c. above.
above.
Section III. PNEUMATIC EQUIPMENT SYSTEM
is rated at 34.4 cubic fpm capacity at 250 psi. They are two-
5-55.
General
stage, with automatic start-stop pressure switches, set with a
The pneumatic system of the tug consists of two motor driven
differential or from 10 to 20 psi. Number 1 compressor has the
air compressors, with storage reservoirs, lines, fittings, and
largest differential, and may be used as the standby, or reserve
allied instruments and gages. Primary purpose of this system
compressor. Both compressors can be placed on automatic.
is to provide compressed air for starting, and/or reversing the
Two
direction of rotation of the propulsion engine. Each compressor
5-132
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