RXF ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.410-IOM (JAN 12)
Page 26
DEMAND PUMP DISASSEMBLY
BEFORE OPENING ANY VIKING PUMP
LIQUID CHAMBER (PUMPING CHAM-
BER, RESERVOIR, JACKET, ETC.)
ENSURE:
1. THAT ANY PRESSURE IN THE CHAMBER HAS BEEN
COMPLETELY VENTED THROUGH SUCTION OR DISCHARGE
LINES OR OTHER APPROPRIATE OPENINGS OR CONNEC-
TIONS.
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 con-
nections 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 opening
and between the rotor teeth to keep the shaft from turning.
Turn the locknut counterclockwise and remove locknut. See
Figure 29 or 30.
6. Loosen the two setscrews in the face of bearing housing
and turn the thrust bearing assembly counterclockwise and
remove from casing. See Figure 29 or 30.
7.
GG, HJ, HL
: Remove the snap ring from the shaft. See
Figure 29.
AS, AK, AL
: Remove the bearing spacer from the
shaft. See Figure 30.
8. Remove the brass bar or piece of hardwood from the
port opening.
9. The rotor and shaft can now be removed by tapping on
the end of the shaft with a lead hammer or, if using a regular
hammer, use a piece of hardwood between the shaft and
hammer. The rotary member of the seal will come out with
the rotor and shaft.
10.
AS, AK, AL
: Remove the bearing retainer washer. The
washer may have stayed with rotor and shaft when removed
or is against ball bearing. See Figure 30.
11. Remove the mechanical seal rotary member and spring
from the rotor and shaft assembly.
12.
GG, HJ, HL
: Remove inner snap ring and single-row ball
bearing from the casing.
AS, AK, AL
: Remove single-row ball bearing from casing.
13. Remove seal seat or stationary part of seal from casing.
14. Disassemble the thrust-bearing assembly.
GG, HJ, HL
: Remove outer snap ring from the bearing hous ing
and remove the ball bearing. See Figure 29.
AS, AK, AL
: Loosen the two set screws in flange outside
diameter. Rotate end cap and lip seal counterclockwise and
remove. Remove the ball bearing. See Figure 30.
The casing should be examined for wear, particularly in the
area between ports. All parts should be checked for wear
before the 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
.
Clean all parts thoroughly and examine for wear or damage.
Check lip seals, ball bearings, bushing, and idler pin and
replace if necessary. Check all other parts for nicks, burrs,
excessive wear and replace if necessary.
Wash bearings in clean solvent. Blow out bearings with
compressed air.
Do not allow bearings to spin
; turn them
slowly by hand. Spinning bearings will damage the race
and balls. Make sure bearings are clean, then lubricate with
refrigeration oil and check for roughness. Roughness can
be determined by turning outer race by hand. Replace the
bearings if they have roughness.
Be sure shaft is free from nicks, burrs and foreign particles
that might damage mechanical seal. Scratches on shaft in
seal area will provide leakage paths under mechanical seal.
Use fine emery cloth to remove scratches or sharp edges.
Figure 29 - Thrust-Bearing assembly (gg, HJ, HL)
Figure 30 - Thrust-Bearing assembly (AS, AK, AL)
