Frick RWB II 480, Установка, эксплуатация и обслуживание

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RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-200 IOM
Page 27
13. Pack lubrication chamber between inner ball bearing
and double-row ball bearing in the thrust-bearing assembly
approximately one-half full of multipurpose grease, NLGI #2.
The thrust-bearing assembly will take the remaining space.
See Figure 22 and 23.
14. Pack double-row ball bearing with multipurpose grease,
NLGI #2.
GG, HJ, HL: Install ball bearing into bearing housing with
shield side toward coupling end of shaft. See Figure 22. In-
stall snap ring into bearing housing to retain ball bearing.
This snap ring has a tapered edge to fit tapered groove in
bearing housing. The tapered edge is located away from ball
bearing.
AS, AK, AL: Install ball bearing into bearing housing. Install
lip seal in bearing housing end cap. The lip should face to-
wards end of shaft. Put bearing spacer collar in lip seal and
install in bearing housing and tighten setscrews securely. See
Figure 23.
15. Insert brass bar or hardwood through port opening be-
tween rotor teeth to keep shaft from turning.
16. Start thrust-bearing assembly into casing. Turn by hand
until tight. This forces rotor against head. Replace and tighten
locknut or shaft.
17. Remove brass bar or hardwood from port opening.
18. Adjust pump end clearance.
BEFORE STARTING PUMP, EN-
SURE THAT ALL DRIVE EQUIP-
MENT GUARDS ARE IN PLACE.
FAILURE TO PROPERLY MOUNT GUARDS MAY RESULT
IN SERIOUS INJURY OR DEATH.
THRUST BEARING ADJUSTMENT
See Figures 22 and 23.
Loosen two screws in face of thrust-bearing assembly.
If shaft cannot be rotated freely, turn thrust-bearing assem-
bly counterclockwise until shaft can be turned easily.
1. While turning rotor shaft, rotate thrust-bearing assembly
clockwise until noticeable drag occurs. This is zero end
clearance.
2. Mark position of bearing housing with respect to the casing.
3. Rotate thrust-bearing assembly counterclockwise the dis-
tance listed below as measured on outside of bearing
housing.
4. Tighten two setscrews in face of bearing housing after
adjustment is made to secure thrust-bearing assembly
position.
For viscosities above 2500 SSU, add additional end clear-
ance (0.004" for GG, HJ and HL size pumps and 0.005" for
AS, AK and AL size pumps).
Pump Distance (in.) on O.D. End Clearance
Size of Bearing Housing (in.)
GG 7/16 .003
HJ, HL 9/16 .003
AS, AK, AL 1/2
.
003
INSTALLATION OF CARBON GRAPHITE
BUSHINGS
When installing carbon graphite bushings, extreme care must
be taken to prevent breaking. Carbon graphite is a brittle
material and easily cracked. If cracked, the bushing will quickly
disintegrate. Using a lubricant and adding a chamfer on the
bushing and the mating part will help in installation. The ad-
ditional precautions listed below must be followed for proper
installation:
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Starting and stopping will result in a cracked bushing.
4. Check bushing for cracks after installation.
DISASSEMBLY
BEFORE OPENING ANY PUMP LIQUID CHAMBER
(PUMPING CHAMBER, RESERVOIR, JACKET ETC.) EN-
SURE:
1. THAT ANY PRESSURE IN CHAM-
BER HAS BEEN COMPLETELY
VENTED THROUGH SUCTION OR
DISCHARGE LINES OR OTHER APPROPRIATE OPEN-
INGS 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 PUMP.
FAILURE TO FOLLOW ABOVE LISTED PRECAUTIONARY
MEASURES MAY RESULT IN SERIOUS INJURY OR
DEATH.
Mark valve and head before disassembly to ensure proper
reassembly.
TROUBLESHOOTING
NOTE: Before making any pump adjustment or opening
the pump liquid chamber in any manner, make sure that:
1. Any pressure in the pumping chamber has been vented
through the suction or discharge lines or other openings pro-
vided for this purpose.
2. The driver has been “locked out” so that it cannot inadvert-
ently be started while work is being done on the pump.
3. The pump has been allowed to cool down to the point that
there is no chance of anyone being burned.
If trouble does develop, one of the first steps toward finding
the difficulty is to
install a vacuum gauge in the suction port
and a pressure gauge in the discharge port. Readings on
these gauges often will give a clue as to where to start look-
ing for the trouble.
Vacuum Gauge—Suction Port
1. High reading would indicate:
a. Suction line blocked - foot valve stuck, gate valve
closed, strainer plugged.
b. Liquid too viscous to flow through the piping.
c. Lift too high.
d. Line too small.