Carver Pump GH - REASSEMBLY OF PUMP

I-120
GH Pump 120 – 16.02.EN
21
NOTE
If gaskets are disturbed from position replace
with new.
The following steps are for pumps with a
bearing frame.
17. Remove socket head bolt (*608) fastening
bearing cap (*35) to bearing frame (*19).
Remove bearing cap from bearing frame.
18. Remove coupling (*42) from shaft (*6).
19. Remove the shaft (*6) (with radial and thrust ball
bearing assemblies) from the bearing frame
(*19).
20. Uncrimp tang on bearing lockwasher (*69) and
remove bearing locknut (*22) and bearing
lockwasher.
NOTE
If ball bearings are disturbed from position
replace with new.
21. If desired, pull ball bearing (*18) from shaft (*6).
22. If desired, pull ball bearing (*16) from shaft (*6).
C. PARTS INSPECTION.
1. All parts should be thoroughly cleaned with a
suitable solvent or replaced with new ones if
necessary.
2. All sealing faces should be perfectly clean. All
ball bearings, mechanical seals, gaskets, O-
rings, lip seals, and locking devices with a
nylock feature are to be replaced with new if
disturbed from position.
3. Check shaft for runout, scratches, grooves, or
any possible damage. Touch up scratches and
grooves with a polishing cloth and inspect for
remaining grooves or deep scratches. A bent or
excessively damaged shaft should be replaced.
4. Inspect the casing for pitting, scoring, and
erosion. The inside of the casing should be free
of any pits or grooves. The maximum allowable
depth is 1/8” (3mm). Replace the casing if any
of these defects are present.
5. If the suction cover on an open impeller pump
shows excessive wear on the face due to
abrasion or corrosion, and performance cannot
be restored, replace suction cover.
6. Inspect and replace any defective grease
fittings.
7. Inspect mechanical seal. Replace the
mechanical seal that is disturbed from position
or damaged.
8. Inspect the impeller and bushing keys for
distortion and push fit into keyways. The keys
should be square on all four edges. They should
fit without having to be forced. The keys should
not rock in keyway. Replace keys or shaft if
necessary.
9. Inspect ball bearings (16 and 18) for damage. A
damaged bearing must be replaced. If a bearing
is removed from the shaft, it is recommended
that the bearing be replaced. If bearing
replacement is not possible and bearing is in
good condition bearing should be cleaned and
protected until ready to use. Refer to Section X,
Paragraph A.
10. Check the shaft sleeves and spacer sleeves
visually for score marks, scratches, pits,
grooves or burrs. Touch up sleeves with
polishing cloth and inspect for remaining
grooves or deep scratches. Remove burrs with
a file. Shaft sleeves and spacer sleeves should
be replaced if any marks, pits or grooves are
still visible after touching up.
11. Inspect tubing for kinking. Replace kinked
tubing.
12. If the impeller shows excessive wear due to
erosion or pitting, so that performance cannot
be restored, it must be replaced. If a new
impeller is installed, check to make sure that it is
balanced and of the correct trim. If an impeller is
restored or replaced check the dynamic balance
of the rotor before reassembly of the pump.
13. If enclosed impeller (2) is equipped with optional
wear rings, check the wear ring clearance as
follows:
a. Measure outside diameter of front impeller
hub (2) in three places.
b. Measure inside diameter of wear ring (7) in
three places.
c. If difference between the high reading of the
inside diameter of the wear ring (7) and the
low reading of the outside diameter of the
impeller (2) wear ring exceeds double the
new maximum clearances given in Table 6,
replace the wear ring according to Section
XI, Paragraph G.
d. Measure outside diameter of back impeller
hub (2) in three places.
e. Measure inside diameter of the backcover
wear ring (7X) in three places.