Richter RMA Series - Manual (Page 16)

Series RMA
Page 16
9475-050-en Revision 12
TM 7978 Edition 08/2010
7 Maintenance
7.1 Safety-relevant screw fittings
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
housing flange
suction flange
discharge flange
draining flange
See also Section 6.1.1, point 1.
Other inspections are to be performed regularly,
depending on the operating requirements.
7.2 Bearing pedestal
The temperature of the bearing pedestal is
not to exceed more than 158 °F (70 °C) and
under no circumstances 176 °F (80 °C).
If higher temperatures do occur, call in qualified staff
without delay. If this is not possible, the pump must be
shut down and taken out of service.
In many cases a vibration measurement is
recommended to detect bearing wear in good time.
7.2.1 Long life grease lubrication
Grease fill ball bearings of the series 2RS are
installed as standard features. The grease is lithium-
saponified. The admissible temperature range is – 22
°F und 230 °F (- 30 °C und + 110 °C).
The ball bearings are designed for an L10 service life
of >17,500 hours. The service life of the grease
filling guaranteed by the bearing manufacturers is
given in the following table.
Size Bearing size > Service life
Group 1 6207-2RS / 17500 hr*
Group 2 6210-2RS / 17500 hr*
* at bearing temperature < 122 °F (< 50 °C)
at bearing temperature 158 °F (70 °C) approx. 10000 hr
If the pump is serviced, it is recommended to also
replace the bearings as a precaution..
In potentially explosive works it is
advisable to monitor the condition of
the ball bearings.
7.2.2 Oil bath lubrication
We recommend a mineral oil with the following
characteristics for an expected bearing temperature
up to 158 °F (70 °C).
Viscosity index :
85 . appr
Kinematic viscosity at 104 °F (40 °C) :
s
2
mm 40 . appr
A fully synthetic gear oil to ISO VG 220 is to be used
for temperatures below – 4 °F (– 20 °C).
Replacing the bearings: The ball bearings are
designed for an L
10
service life of >17,500 hours.
We recommend 17.500 working hours respectively
every 3 years a change of bearing should be made.
Oil changes: 1x per year at bearing temperatures
up to 122 °F (50 °C).
Every 6 months at bearing temperatures up to
158 °F (70 °C).
At higher temperatures more frequently in
accordance with the regulations.
When the pump is serviced, it is recommended to
replace the bearings and shaft seals as a precaution
and to pour in fresh oil.
Oil level check: The oil level is to be regularly
checked on the constant level oiler 638/1 to ensure
safe operation.
It must be ensured that there is always oil in the
constant level oiler; it must under no circumstances
be completely drained.
In potentially explosive works it is
advisable to monitor the condition of
the rolling bearings
If there is a suspicion that splash water could have
entered the bearing pedestal, the oil must be
replaced immediately. Even small amounts of water
in the oil reduce the service life of the rolling
bearings to a fraction of the normal service life.
If the pump is serviced, it is recommended to also
replace the bearings and the rotary shaft seals as a
precaution and to pour in fresh oil.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
The ingress of water into the bearing pedestal will
substantially impair ball bearing lubrication.