14
5.3- Checks to be Made While The Pump is Running
• The bearing temperature may exceed the ambient temperature by up to 50 ºC. But must never rise
above 80 ºC.
• The valves in the auxiliary lines must remain open while the pump is runing.
• The pump has soft packing type stuffing boxes. These should drip during operation. The gland nuts
should only be lightly tightened. In case of excessive leakage from the stuffing box tighten the gland
nuts slowly and evenly until the leakage is reduced to the dripping state. Check the stuffing box for
overheating by hand. If the gland nuts can not be tightened any further remove the old packing rings.
Make sure that each packing ring is cut of correct size. The joint in successive ring should be offset
to each other.
• The flexible coupling elements should be regularly checked and replaced as soon as they are shown
signs of wear.
• Occasionally check the motor current. Stop motor if the amperage is higher than usual; there may
be jamming or friction in the pump. Make the necessary mechanical and electrical checks.
• Stand-By pumps should be run for a short time at least once a week to ensure they are in constant
readiness for operation. Check the integrity of auxiliary connections.
6- LUBRICATION
• Bearing of SDS type pumps have grease lubricated ball bearings.
• Life-time grease lubricated bearings are maintenance free.
• See the attached
Table 4
for bearings type and size.
6.1- Application of Grease on the Bearing
High quality NLGI 2 or NLGI 3 grease must be used in bearings.
The grease must be replaced in every 12-14 months or at the end of each 3000 working hours.
More frequent grease replacement may cause overheating and shortening of the bearing life.
The bearings of the pumps demounted for repair must be inspected and replaced, if necessary.
It must be ensured that the greasing equipment and the reservoir are clean before adding grease to
the bearings.
Grease in suitable amounts must be added to the bearings.
The temperatures of the bearings may increase in the case of adding excessive amount of grease.
The temperatures of the bearings will decrease to the normal operating temperature when excessive
grease is removed.
• The pump must never run dry.
• Never run the pump for along period against a closed discharge valve (at zero flow)
ATTENTION
Pump Dimension
Group
Shaft end
Dimension ø
A
B
C
35
42
55
Bearing Type
6308 C3
6310 C3
6312 C3
Table 4
The bearing temperature must never exceed the ambient temperature by maximum 50 °C.
Also, it must not exceed 80 °C under no circumstances.
ATTENTION
