ENGLISH
27
Checking the direction of rotation
The direction of rotation should be checked in the following way every time the pump is connected to a new
installation.
Procedure
1.
Let the pump hang from a lifting device, e.g. the hoist used for lowering the pump into the tank.
2.
Start and stop the pump while observing the movement (jerk) of the pump. If connected correctly,
the pump will rotate clockwise, i.e. it will jerk counter-clockwise. See fig. 10. If the direction of
rotation is wrong, interchange any two of the phases in the power supply cable.
8. MAINTENANCE AND SERVICE
Routine maintenance work, limited to checking, cleaning or replacing limited parts, may be carried out only by expert and
qualified personnel, provided with suitable equipment, who know the safety regulations for the working environment and have
read and carefully checked the content of this manual and of any other documentation attached to the product.
Special maintenance or repairs must be entrusted to authorised Dab Pumps service centres.
Before starting any work on the system or troubleshooting, ensure that the main switch is off and that the power
supply cannot be switched on again accidentally. Check that all the protection systems are correctly connected and
that all the rotating parts are stopped.
Maintenance work on explosion-proof pumps must be carried out by DAB Pumps or a service workshop authorized
by DAB Pumps.
However, this does not refer to hydraulic components such as the pump body, the impeller and the mechanical seal.
The replacement of the cable must be carried out exclusively by the manufacturer’s service centre or by another
qualified person.
The pump may have been used for pumping liquid that is harmful to health, contaminated or toxic. Take all the
precautions concerning health and safety before carrying out maintenance or repairs.
Use genuine spare parts only for repairs.
Select the spare parts to be ordered, consulting the exploded drawings available on the DAB Pumps site or the DNA selection software.
The manufacturer declines any responsibility for eventual damages to persons, animals or things for maintenance and repair
interventions carried out by non authorized personnel or with no genuine spare parts.
Specify the following information when ordering spare parts:
1. The type of electric pump.
2. Serial number and manufacturing year.
3. Denomination and reference number of the spare parts.
4. Required number of parts.
8.1 Routine Maintenance
Pumps running normal operation should be inspected every 3000 operating hours or at least once a year. If the pumped liquid is very
muddy or sandy, inspect the pump at shorter intervals.
Check the following points:
•
Power consumption
See pump nameplate.
•
Oil level and oil condition
When the pump is new or after replacement of the shaft seal, check the oil level and water content after one week of operation. If there is
more than 20 % extra liquid (water) in the oil chamber, the shaft seal is defective. The oil should be changed after 3000 operating hours
or once a year.
•
Cable entry
Make sure that the cable entry is watertight (visual inspection) and that the cable is not sharply bent and/or pinched.
•
Pump parts
Check impeller, pump housing, etc. for possible wear. Replace defective parts.
•
Ball bearings
Check the shaft for noisy or heavy operation (turn the shaft by hand). Replace defective ball bearings.
A general overhaul of the pump is usually required in case of defective ball bearings or poor motor function. This work must be done by
an assistance workshop authorised by
DAB Pumps.
Fig. 10
Jerk direction
