Table of Contents
Advertisement
11. Maintaining the pump
Depending on the conditions and operating time, make the
following checks at regular intervals:
•
Check that the pump meets the required performance and is
operating smoothly and quietly.
•
Check that there are no leaks, particularly at the shaft seal.
•
Check that the motor is not overheating.
•
Remove and clean all strainers or filters in the system.
•
Check that the tripping function of the motor overload
protection works.
•
Check the operation of all controls.
•
If the pump is not operated for unusually long periods,
maintain the pump in accordance with these instructions.
In addition, if the pump is not drained, the pump shaft should
be manually rotated or run for short periods of time at monthly
intervals.
•
In severe duty applications, pump life may be extended by
performing one of the following actions:
– Drain the pump after each use.
– Flush the pump with water or other liquid that is compatible
with the pump materials and process liquid.
– Disassemble the pump and thoroughly rinse or wash
components in contact with the pumped liquid with water or
other liquid that is compatible with the pump materials and
process liquid.
If the pump fails to operate or there is a loss of performance, see
to section 15. Diagnosing specific problems.
12. Maintaining the motor
Warning
Before starting work on the motor, make sure that
all power supplies to the motor have been
switched off and that they cannot be accidentally
switched on. Electric shock can cause serious or
fatal injury. Only qualified personnel should
attempt installation, operation, and maintenance
of this equipment.
12.1 Motor inspection
Inspect the motor approximately every 500 hours of operation or
every three months, whichever occurs first. Keep the motor clean
and the ventilation openings clear.
Go through the following steps during each inspection:
1. Check that the motor is clean. Check that the interior and
exterior of the motor are free of dirt, oil, grease, water, etc.
Oily residue, paper, pulp, textile lint, etc. can accumulate and
block motor ventilation. If the motor is not properly ventilated,
overheating can occur and cause early motor failure.
2. Check all electrical connections to be sure that they are
tightened securely.
14
13. Replacing the motor
Motors used on CR pumps are specifically
selected to our rigid specifications.
Replacement motors must be of the same frame
Caution
size, should be equipped with the same or better
bearings and have the same service factor.
Failure to follow these recommendations may
result in premature motor failure.
If the motor is damaged due to bearing failure, burning or
electrical failure, observe the following instructions as to how to
remove the motor and how to mount the replacement motor.
Warning
Before starting work on the motor, make sure that
the mains switch has been switched off. It must
be ensured that the power supply cannot be
accidentally switched on.
13.1 Disassembly
Proceed as follows:
1. Disconnect the power supply leads from the motor.
Remove the coupling guards.
For CR 1, 3, 5, 10, 15: Do not loosen the three
Note
Note
hexagon socket head cap screws securing the
shaft seal.
2. Use the proper metric hexagon key to loosen the four cap
screws in the coupling. Remove coupling halves completely.
3. Use the correct size spanner to loosen and remove the four
mounting bolts joining motor and pump.
4. Lift the motor straight up until the shaft has cleared the motor
stool.
13.2 Assembly
Proceed as follows:
1. Remove key from motor shaft, if present, and discard.
2. Thoroughly clean the surfaces of the motor and pump
mounting flanges. The motor and shaft must be clean of all oil
or grease and other contaminants where the coupling
attaches. Place the motor on top of the pump.
3. Turn the terminal box to the desired position by rotating the
motor.
4. Insert the four mounting bolts, then tighten diagonally and
evenly:
– for 0.38" (10 mm) bolts (1/2 - 2 hp), torque = 17 ft-lb (23 Nm)
– for 0.50" (13 mm) bolts (3-40 hp), torque = 30 ft-lb (41 Nm)
– for 0.63" (16 mm) bolts (50-100 hp), torque = 59 ft-lb (80 Nm)
– follow instructions for particular pump model in sections
13.2.2 CR 1s, 1, 3, and 5.
- Quick Links:
- Diagnosing Specific Problems
Hide quick links:
Advertisement
Table of Contents
