
RWH ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.620-IOM (DEC 12)
Page 27
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 29.
11.
Remove the mechanical seal rotary member and spring
from rotor and shaft assembly.
12. GG, HJ, HL:
Remove inner snap ring and singlerow ball
bearing from casing.
AS, AK, AL:
Remove singlerow ball bearing from casing.
13.
Remove seal seat or stationary part of seal from casing.
14.
Disassemble thrustbearing assembly.
GG, HJ, HL:
Remove outer snap ring from bearing hous ing
and remove ball bearing. See Figure 28.
AS, AK, AL: Loosen two set screws in flange outside diameter.
Rotate end cap and lip seal counterclockwise and remove.
Remove ball bearing. See Figure 29.
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
.
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 com
pressed air. Do not allow bearings to spin; turn them slowly
by hand. Spinning bearings will damage 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 bearings if bearings
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.
PUMP ASSEMBLY
Assembly Notes On Standard Mechanical Seal (Synthetic
Rubber Bellows Type)
NOTICE
Read carefully before reassembling pump
The seal used in this pump is simple to install and good
performance will result if care is taken during installation.
The principle of mechanical seal is contact between the
rotary and stationary members. These parts are lapped to
a high finish and their sealing effectiveness depends on
complete contact.
Prior to installing rotary portion of mechanical seal, prepare
and organize rotor shaft, head and idler assemblies and ap
propriate gaskets for quick assembly
Once rotary portion of mechanical seal is installed on rotor
shaft, it is necessary to assemble parts as quickly as pos
sible to ensure that the seal does not stick to shaft in wrong
axial position. The seal will stick to the shaft after several
minutes setting time.
Never touch sealing faces with anything except clean hands
or clean cloth. Minute particles can scratch the seal faces
and cause leakage.
1.
Coat idler pin with refrigeration oil and place idler and
bushing on idler pin in head. If replacing a carbongraphite
bushing, refer to "Installation of Carbon Graphite Bushings".
2.
Clean rotor hub and casing seal housing bore. Make sure
both are free from dirt and grit. Coat outer diameter of seal
seat and inner diameter of seal housing bore with refrigera
tion oil.
3.
Start seal seat in seal housing bore. If force is necessary,
protect seal face with a clean cardboard disc and gently tap it
in place with a piece of wood. Be sure seal seat is completely
seated in the bore.
4.
Place tapered installation sleeve on shaft. Refer to Figure
31. Sleeve is furnished with GG, AS, AK, and AL replacement
mechanical seals. Coat rotor shaft, tapered installation sleeve,
and inner diameter of mechanical seal rotary mem ber with
a generous amount of refrigeration oil. Petrolatum may be
used but grease is not recommended.
Figure 30
Figure 31
Содержание Frick 1179
Страница 36: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 36 Figure 37 OIL LEVEL TRANSMITTER ...
Страница 41: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 41 COMPRESSOR PORT LOCATIONS 408 MM ...
Страница 51: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 51 OPERATING LOG SHEET ...
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