Servicing The Product; Maintaining The Product - Grundfos CRK Series Instructions Manual

8. Servicing the product

WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
WARNING
Moving parts
Death or serious personal injury
- Tighten the coupling screws to the
correct torque.
- Install the coupling guards securely to
the pump with the screws intended for
this purpose.
CAUTION
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.

8.1 Maintaining the product

Pump bearings and shaft seal are maintenance-free.
8.1.1 Motor bearings
Motors not fitted with grease nipples are
maintenance-free.
Motors fitted with grease nipples should be
lubricated with a high-temperature, lithium-based
grease. See the instructions on the fan cover.
In the case of seasonal operation (motor is idle for
more than 6 months of the year), we recommend to
grease the motor when the pump is taken out of
operation.
Depending on the ambient temperature, the motor
bearings must be replaced or lubricated according to
the table below. The table applies to 2-pole motors.
The number of operating hours stated for bearing
replacement are guidelines only.
Bearing replacement interval
Motor
[operating hours]
size
[kW]
40 °C 45 °C
0.37 - 0.75 18000 -
1.1 - 7.5 20000 15500 12500 10000
Lubrication interval
Motor
[operating hours]
size
[kW]
40 °C 45 °C
11 - 18.5 4500 3400
22 4000 3100
30-55 4000 3000
75 2000 1500
Intervals for 4-pole motors are twice as long as those
for 2-pole motors.
If the ambient temperature is lower than 40 °C,
bearings must be replaced/lubricated at the intervals
mentioned under 40 °C.
50 °C 55 °C 60 °C
- - -
7500
50 °C 55 °C 60 °C
2500 1700 1100
2300 1500 1000
2000 1500 -
1000 500 -
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