Blue Angel Pumps EC50 - Manual (Page 3)

15. Press shaft seal into backhead. When
pressing shaft seal into place, apply
force to the cup flange. Avoid touch-
ing the polished seal surface; oil or
scratches on this surface may cause
premature failure of the seal.
16. Press ceramic side of seal into
impeller, ceramic side out. Avoid
touching ceramic with hands as oil
may cause premature failure of the
seal. Wipe oil off both sides of seal
with a soft, lint-free cloth.
17. Reassemble unit in reverse order,
beginning with step 9.
18. After reassembly check shaft for free
rotation with screwdriver in fan
through air exit openings.
3
Maintenance
(Continued)
2. Relieve pressure in system.
3. Disconnect inlet and outlet lines.
4. Empty water from pump housing.
5. Place pump on bench with motor end
up and remove brushes as described
in BRUSH REPLACEMENT instruc-
tions. If brushes are to be reused,
mark the location from which each
came. Replace brushes in original ori-
entation upon completion of repair.
6. Remove the four cap screws holding
motor housing and pump housing
together. Motor housing is now free
and can be removed. Take care not to
lose commutator bearing finger
spring.
7. With a screwdriver, pry the rotor-
backhead assembly out of the pump
housing.
8. Remove the impeller by turning
counter clockwise (righthand thread
on shaft). Save any washers which
were between impeller hub and
shaft.
9. Remove backhead (the bearing is
press fit into the backhead).
10. Place backhead on flat surface with
impeller side down and press out
shaft seal.
11. Place impeller on flat surface with
vane side down and with screwdriver
and hammer break ceramic seal ring
into several pieces and remove. Next,
remove rubber seal ring cup from
impeller.
12. Remove bearings from armature shaft
(press-fit on shaft).
13. Inspect the armature commutator
bars. The environment in which the
unit has been operating will have
influence on the condition of the
commutator. Airborne dust an dirt
will accelerate wear. A rough or
scarred appearance may dictate hav-
ing commutator reconditioned before
reassembly.
14. To reassemble, install new bearings on
the shaft. Always press against the
inner race to prevent bearing dam-
age. Make sure bearings are tight
against the shaft shoulders.
Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
Pump will not start
or run
Pump will not prime
or retain prime after
operating
Flow rate is too low
Seal leaks
1. Blown fuse
2. Low line voltage
3. Worn brushes
4. Impeller blocked
5. Defective motor
1. Air leak in suction line
2. Impeller blocked
3. Worn seal
4. Suction lift too high
5. Hose kinked or looped
6. Fittings not tight
7. Suction hose out of water
8. Clogged inlet
1. Piping or hose is fouled or
damaged
2. Low line voltage
1. Worn seal
2. Shaft grooved
3. Pump head loose on motor
1. If blown, replace with proper sized fuse or reset breaker
2. If voltage is under 108 volts, check wiring size
3. Replace brushes
4. Remove blockage
5. Replace motor or pump
1. Repair or replace suction line
2. Remove blockage
3. Replace seal
4. Lower pump
5. Straighten hose
6. Tighten fittings
7. Submerge suction hose end
8. Clean inlet
1. Clean or replace
2. If voltage is under 108 volts, check wiring size
1. Replace seal
2. Replace rotor
3. Insure proper assembly and no obstruction, tighten bolts
EC50
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