Xylem IM014 Model SST-C and Model SST-F - Manual (Page 3)

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O. Remove shaft and bearings from frame (frame-mount).
P. Straighten tang in lockwasher. Remove locknut and
lockwasher (frame-mount).
Q. Use bearing puller or arbor press to remove ball bearings
(frame-mount).
R. Remove shaft sleeve if badly scored. Shaft sleeve is bonded
to the shaft and must be heated to about 250ºF to facilitate
removal.
S. Remove wear ring if excessively worn. Use pry bar and/or
vicegrips.
X. Reassembly:
A. All parts should be cleaned before assembly.
B. Refer to parts list to identify required replacement items.
C. Reassembly is the reverse of the disassembly procedure.
D. Replace lip seals if worn or damaged (frame-mount).
E. Replace ball bearings if loose, rough or noisy when rotated
(frame-mount).
F. Check shaft for maximum runout of .005" TIR. Bearing seats
and lip seal areas must be smooth and free of scratches or
grooves. Replace if necessary (frame-mount).
G. Shaft sleeve surface must be smooth. Spray both shaft
sleeve fit and bore with LOCQUIC PRIMER “T” (Locktite
product Item No. 74756). Let parts dry and then apply
Loctite #271 on same surfaces. Slide shaft sleeve over shaft,
twisting back and forth a couple of times. Wipe off excess.
Let cure according to instructions. Purchase Loctite products
at Auto Parts or Hardware store.
H. All mechanical seal components must be in good condition
or leakage may result. Replacement of complete seal as-
sembly, whenever seal has been removed, is good
standard practice.
I. If wear ring is being replaced, use no lubricants on the
metal-to-metal fit when pressing in the replacement.
J. If the impeller is removed, as for example to effect a me-
chanical seal change, this procedure must be followed: Old
impeller bolt and impeller gaskets cannot be re-used.
K. With the stationary and rotary part of the mechanical seal
and impeller gasket (hub to sleeve) properly installed, mount
the impeller on the shaft but do not install the mechanical
seal spring and the retainer as yet. With the impeller bot-
tomed on the shaft sleeve note the distance of the shaft end
to the face of the impeller hub on the inlet side. Remove the
impeller from the shaft.
L. Install the mechanical seal spring retainer to the spring.
Retainer should snap in place evenly. Install spring/retainer
assembly on the shaft and mechanical seal with free-end of
spring toward the mechanical seal.
M.Install key in shaft keyway and mount impeller on shaft with
the spring fairly well centered. Push impeller until it bottoms,
hold in position and note shaft end to impeller hub face
distance. It should match that obtained in step 2. If greater
than in step 2, there is a strong possibility that the retainer is
pinched between the impeller and sleeve. This is not correct
and the process must be repeated until the correct distance
is obtained.
N. Hold the impeller in place and install the impeller gasket
(hub to washer) and the previously prepared impeller bolt
and washer assembly. Tighten bolt to 35 lb.-ft.
XI. Trouble-Shooting:
A. Motor does not start, and no noise or vibration occurs:
1. Power supply not connected.
2. Fuses or protection device tripped or defective.
3. Loose or broken electrical connections.
B. Motor will not start, but generates noise and vibration:
1. Motor not wired as directed on diagram.
2. Shaft locked due to mechanical obstructions in motor
or pump.
3. Low voltage or phase loss on three phase supply.
C. Pump does not deliver rated capacity:
1. Pump not filled and primed.
2. Pump has lost prime due to leaks in suction line.
3. Direction of rotation incorrect. See Rotation.
4. Head required is higher than that originally specified.
(Valve may be partially closed.)
5. Foot valve clogged.
6. Suction lift too high.
7. Suction pipe diameter too small.
D. Protection trips as unit starts:
1. Phase loss on three-phase supply.
2. Protection device may be defective.
3. Loose or broken electrical connections.
4. Check motor resistance and insulation to ground.
E. Protection device trips too often:
1. Protection may be set to a value lower than motor full
load.
2. Phase loss due to faulty contacts or supply cable.
3. Liquid is viscous or its specific gravity is too high.
4. Rubbing occurs between rotating and stationary parts.
F. Shaft spins with difficulty:
1. Check for obstructions in the motor or the pump.
2. Rubbing occurs between rotating and stationary parts.
3. Check bearings for proper conditions.
G. Pump vibrates, runs noisily, and flow rate is uneven:
1. Pump runs beyond rated capacity.
2. Pump or piping not properly secured.
3. Suction lift too high.
4. Suction pipe diameter too small.
5. Cavitation caused by insufficient liquid supply or
excessive suction losses.
6. Impeller blockage.
H. When stopped, unit turns slowly in the reverse direction:
1. Leaks on air locks in suction pipe.
2. Partial blockage in check valve.
I. In pressure boosting applications, the unit starts and
stops too often:
1. Pressure switch settings are incorrect.
2. Tank size may be incorrect.
J. In pressure boosting applications, the unit does not stop:
1. Pressure switch maximum setting is higher than
was specified.
2. Direction of rotation incorrect. See Rotation.