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Section 8..................................................................Pump Troubleshooting
1. PUMP TROUBLESHOOTING
When investigating trouble with Pentair Southern Cross pumps, always remember that pumps
have been tested at the factory and are mechanically correct when sent out. Discounting the
possibility of damage during transit, most of the trouble in the field is due to faulty installation. Inves-
tigation shows that the majority of troubles with centrifugal pumps result from faulty conditions on the
suction side.
2. BREAK DOWN-CAUSE-CHECK POINTS
In case of breakdown we recommend the location of the fault by using the following table:
BREAKDOWN POINTS
Pump does not deliver
Pump delivers at reduced
capacity
Delivery performance
deteriorates
Pump delivers too much
Delivery is interrupted
After stopping pump runs in
reverse direction
Very noisy
Unsteady running of pump
Stuffing box leaks excessively
Fumes from stuffing box
Pump rotor locked in standstill
position
Pump is heating up and seizing
Bearing temperature increases
Motor will not start
Motor gets hot or burns out
Motor is difficult to start
1
7
8
9
10
25 26 56 57 58
1
2
3
4
5
15 17 18 19 20 21 22 56 57 58
1
3
7
9
10
24 53 57 62
16 56 57 58
1
3
6
7
8
22 23 25 26 56 57 58 62
52
1
2
5
6
7
55 56 57 62
19 20 22 31 32 33 35 36 37 38 39 40 43 44
47 48 49 50 51 54 55 58
24 27 28 29 30 31 47 48 49 53
22 23 24 25 26 27 28 29 30 41 42 43
22 45 46 50
23 24 25 26 27 28 29 30 40 41 42 45 47 48
49 50 54
19 20 21 22 31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 51 54 55 58
14 22 60
14 22 27 28 40 43 50 55 56 57 58 59 60 61
14 22 27 28 45 46 50 58 59 60
37
ISO PRO Centrifugal Pump
CHECKPOINTS
11
12 13 14 15 17 18 19 23
6
7
8
9
10
11
12 13 14 15 16 19 22 23
9
10
11
12 13 14 15 16 19
8
11
12 13 15 19 20 22 54
11
12 13 14
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