Carver RS A, Installation, Operation And Maintenance Manual

Page: 29 / 67

RS Series – Multi-Stage, Ring Section Pumps January 2001
23
G. Wear Ring Replacement
To replace wear rings, proceed as follows:
1. Remove old wear ring from suction
case, insterstage case and/or diffuser.
This can best be accomplished on a
lathe.
2. Press new wear ring in suction case,
interstage case and/or diffuser.
3. Place impeller on an arbor and mount
between centers in a lathe. Indicate
back of impeller hub to within 0.002 inch
TIR maximum to make sure arbor and
impeller are running square.
4. Turn wearing surface of impeller until a
63 Root Means Square (RMS) or better
finish is obtained.
5. Measure outside diameter of impeller
hub and record.
6. Mount suction case, interstage case
and/or diffuser in a lathe, with wear ring
inserted. Indicate male rabbet to within
0.002 inch TIR maximum.
7. Bore wear ring to within the specified
tolerance listed in Table 13 or Table 14
over the recorded size of outside
diameters of impeller hub.
8. Return impeller and casings to pump
assembly.
Table 13. Maximum Wear Ring Clearances
Pump Model Maximum Diametrical Clearance
RS A 0.038 inch (casing & diffuser)
RS B 0.038 inch (casing & diffuser)
RS C 0.034 inch (casing & diffuser)
RS D 0.036 inch (casing & diffuser)
RS E 0.032 inch (casing & diffuser)
Table 14. New Wear Ring Clearance Limits
Pump Model Casing Diametrical Clearance
Limit
Diffuser Diametrical Clearance
Limit
RS A 0.015 to 0.019 inches 0.015 to 0.019 inches
RS B 0.015 to 0.019 inches 0.015 to 0.019 inches
RS C 0.013 to 0.017 inches 0.013 to 0.017 inches
RS D 0.012 to 0.018 inches 0.017 to 0.021 inches
RS E 0.011 to 0.016 inches 0.011 to 0.016 inches
H. Oil Lubrication and Water Cooling
Service
(Refer to Figure 9.)
NOTE
Mark or number each component during
disassembly and assembly according to
sequence.
DISASSEMBLY
1. Remove plugs (425) from bearing caps
(37) on both ends, if applicable. This
allows unit to drain.
2. Remove plug (426) or (428) from bottom
of oil caps (41A) and (41X) and drain oil.
3. Remove bolts (605) or (606) from oil cap
(41A) and (41X). Remove oil caps (41A)
and (41X). Remove o-ring (89G) from oil
caps (41A) and (41X). Remove oil seal
(168) from oil cap (41X).
4. Disconnect male connector retaining
nuts from tube connector body (412).
Remove tube (409). Retaining nuts will
remain with tube.
5. Remove bearing caps (37) by removing
bolts (601). Remove o-rings (89E) and
(89F) from bearing frame (99).