RWF ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-600 IOM
Page 21
oil will fill up in the separator faster than it shows in the
sight glass. Refer to the table in the OIL CHARGE section
for approximate oil charge quantities.
12. Open the suction and discharge service valves, and
also the liquid injection and economizer service valves, if
applicable.
13. Close the disconnect switch for the compressor motor
starter.
14. Start the unit.
DEMAND PUMP DISASSEMBLY
BEFORE OPENING ANY VIKING
PUMP LIQUID CHAMBER (PUMP-
ING CHAMBER, RESERVOIR,
JACKET, ETC.) ENSURE:
1. THAT ANY PRESSURE IN THE CHAMBER HAS BEEN
COMPLETELY VENTED THROUGH SUCTION OR DIS-
CHARGE LINES OR OTHER APPROPRIATE OPENINGS
OR CONNECTIONS.
2. THAT THE DRIVING MEANS (MOTOR, TURBINE, EN-
GINE, ETC.) HAS BEEN “LOCKED OUT” OR MADE NON-
OPERATIONAL SO THAT IT CANNOT BE STARTED
WHILE WORK IS BEING DONE ON THE PUMP.
FAILURE TO FOLLOW ABOVE LISTED PRECAUTIONARY
MEASURES MAY RESULT IN SERIOUS INJURY OR
DEATH.
1. Mark head and casing before disassembly to ensure
proper reassembly. The idler pin, which is offset in the pump
head, must be positioned up and equal distance between
port connections to allow for proper flow of liquid through
the pump.
2. Remove the head capscrews.
3. Tilt top of head back when removing to prevent idler
from falling off idler pin.
4. Remove idler and bushing assembly. If idler bushing
needs replacing, see INSTALLATION OF CARBON
GRAPHITE BUSHINGS.
5. Insert a brass bar or piece of hardwood in the port open-
ing and between rotor teeth to keep shaft from turning. Turn
the locknut counterclockwise and remove locknut. See Fig-
ure 18 or 19.
6. Loosen two setscrews in face of bearing housing and
turn thrust bearing assembly counterclockwise and remove
from casing. See Figure 18 or 19.
7. GG, HJ, HL: Remove snap ring from shaft. See Figure
1. AS, AK, AL: Remove bearing spacer from shaft. See
Figure 2.
8. Remove brass bar or piece of hardwood from port
opening.
9. The rotor and shaft can now be removed by tapping on
end of shaft with a lead hammer or, if using a regular ham-
mer, use a piece of hardwood between shaft and hammer.
The rotary member of the seal will come out with rotor and
shaft.
10. AS, AK, AL: Remove bearing retainer washer. The
washer may have stayed with rotor and shaft when removed
or is against ball bearing. See Figure 19.
11. Remove the mechanical seal rotary member and spring
from rotor and shaft assembly.
12. GG, HJ, HL: Remove inner snap ring and single-row
ball bearing from casing.
AS, AK, AL: Remove single-row ball bearing from casing.
13. Remove seal seat or stationary part of seal from casing.
14. Disassemble thrust-bearing assembly.
GG, HJ, HL: Remove outer snap ring from bearing housing
and remove ball bearing. See Figure 18.
AS, AK, AL: Loosen two set screws in flange outside diam-
eter. Rotate end cap and lip seal counterclockwise and re-
move. Remove ball bearing. See Figure 19.
The casing should be examined for wear, particularly in the
area between ports. All parts should be checked for wear
before pump is put together.
When making major repairs, such as replacing a rotor and
shaft, it is advisable to also install a new mechanical seal,
head and idler pin, idler, and bushing. See INSTALLATION
OF CARBON GRAPHITE BUSHINGS.
fFigure 18. Thrust-Bearing assembly (GG, HJ, HL) Figure 19. Thrust-Bearing assembly (AS, AK, AL)
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