Blue Angel EC50 Istruzioni per l'uso e manuale delle parti - Pagina 3

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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.

Troubleshooting Chart

Symptom

Pump will not start

or run

Pump will not prime

or retain prime after

operating

Flow rate is too low

Seal leaks

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.

Possible Cause(s)

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

15. Press shaft seal into backhead. When

16. Press ceramic side of seal into

17. Reassemble unit in reverse order,

18. After reassembly check shaft for free

Corrective Action

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

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.

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.

beginning with step 9.

rotation with screwdriver in fan

through air exit openings.

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EC50