Frick RWB II, Установка, эксплуатация и обслуживание

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RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-200 IOM
Page 30
13. Pack lubrication chamber between inner ball bearing
and double-row ball bearing in the thrust-bearing as sem bly
ap prox i mate ly one-half full of multipurpose grease, NLGI #2.
The thrust-bearing assembly will take the remaining space.
See Figure 26 and 27.
14. Pack double-row ball bearing with multipurpose grease,
NLGI #2.
GG, HJ, HL: Install ball bearing into bearing hous ing with
shield side toward coupling end of shaft. See Figure 26.
In stall snap ring into bearing hous ing to retain ball bearing.
This snap ring has a ta pered edge to fi t tapered groove in
bearing housing. The tapered edge is lo cat ed away from
ball bearing.
AS, AK, AL: Install ball bearing into bearing hous ing. In stall
lip seal in bearing housing end cap. The lip should face to-
wards end of shaft. Put bearing spac er col lar in lip seal and
install in bearing housing and tighten setscrews se curely.
See Figure 27.
15. Insert brass bar or hard wood through port open ing be-
tween rotor teeth to keep shaft from turn ing.
16. Start thrust-bearing as sem bly into casing. Turn by hand
un til tight. This forces rotor against head. Replace and tight en
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.
FAIL URE TO PROP ER LY MOUNT GUARDS MAY RE SULT
IN SE RI OUS IN JU RY OR DEATH.
THRUST BEARING AD JUST MENT
See Figures 26 and 27.
Loosen two screws in face of thrust-bearing as sem bly.
If shaft cannot be rotated freely, turn thrust-bearing as sem bly
coun ter clock wise until shaft can be turned easily.
1. While turning rotor shaft, rotate thrust-bearing assembly
clockwise until noticeable drag oc curs. This is zero end
clear ance.
2. Mark position of bearing housing with respect to the
cas ing.
3. Rotate thrust-bearing assembly coun ter clock wise the
dis tance listed below as measured on out side of bearing
hous ing.
4. Tighten two setscrews in face of bearing housing after
adjust ment is made to secure thrust-bearing assembly
po si tion.
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
IN STAL LA TION OF CARBON GRAPHITE
BUSH INGS
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
quick ly disinte grate. Us ing a lubricant and adding a cham fer
on the bush ing and the mating part will help in in stal la tion.
The ad di tion al precautions listed below must be fol lowed for
proper installation:
1. A press must be used for in stal la tion.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Start ing and stopping will result in a cracked
bush ing.
4. Check bushing for cracks after in stal la tion.
TROUBLESHOOTING THE DEMAND PUMP
BEFORE OPENING ANY PUMP
LIQ UID CHAM BER (PUMP ING
CHAM BER, RES ER VOIR, JACK ET
ETC.) EN SURE:
1. THAT ANY PRESSURE IN CHAM BER HAS BEEN COM-
PLETE LY VENT ED THROUGH SUC TION OR DIS CHARGE
LINES OR OTH ER AP PRO PRI ATE OPEN INGS OR CON-
NEC TIONS.
2. THAT THE DRIVING MEANS (MOTOR, TUR BINE,
EN GINE, ETC.) HAS BEEN “LOCKED OUT” OR MADE
NON OPERATIONAL SO THAT IT CAN NOT BE STARTED
WHILE WORK IS BEING DONE ON PUMP.
FAILURE TO FOLLOW ABOVE LISTED PRE CAU TION ARY
MEASURES MAY RESULT IN SERIOUS INJURY OR
DEATH.
Mark valve and head before disassembly to ensure proper
reassembly.
If trouble does de vel op, one of the fi rst steps toward fi nd ing
the diffi culty is to in stall a vacuum gauge in the suc tion port
and a pressure gauge in the dis charge port. Read ings on
these gaug es 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 fl ow through the piping.
c. Lift too high.
d. Line too small.
2. Low reading would indicate:
a. Air leak in suction line.
b. End of pipe not in liquid.
c. Pump is worn.
d. Pump is dry - should be primed.
3. Fluttering, jumping, or erratic reading:
a. Liquid va por iz ing.
b. Liquid coming to pump in slugs - possibly an air leak or
in suf fi cient liquid above the end of the suc tion pipe.
c. Vibrating from cav i ta tion, mis align ment, or dam aged
parts.