ENGLISH
34
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.
The ball bearings used are sealed and lubricated, using a special lubricant for high temperatures (-40°C +
150°C).
Defective bearings may reduce the Ex safety.
O-rings and similar parts
During service/replacement, it must be ensured that the grooves for the O-rings as well as the seal faces have
been cleaned before the new parts are fitted.
Used rubber parts must not be reused.
Explosion-proof pumps must be checked by an authorized Ex workshop once a year.
Oil change
After 3000 operating hours or once a year, change the oil in the oil chamber as described below.
If the shaft seal has been replaced, the oil must be changed.
When loosening the screws of the oil chamber, note that pressure may have built up in the
chamber. Do not remove the screws until the pressure has been fully relieved.
Draining of oil
1. Place the pump on a plane surface with one oil screw pointing downwards.
2. Place a suitable container (approx. 1 litre), for instance made of transparent plastic material, under the oil
screw.
Used oil must be disposed of in accordance with local regulations.
3. Remove the lower oil screw.
4. Remove the upper oil screw. If the pump has been in operation for a long period of time, if the oil is
drained off shortly after the pump has been stopped, and if the oil is greyish white like milk, it contains
water. If the oil contains more than 20 % water, it is an indication that the shaft seal is defective and must
be replaced. If the shaft seal is not replaced, the motor will be damaged. If the quantity of oil is smaller
than the quantity stated, the shaft seal is defective.
5. Clean the faces for the gaskets for oil screws.
Filling with oil
1. Rotate the pump so that one of the two oil holes in a vertical position facing upwards.
Fig. 11
Oil filling holes
Oil filling hole
(in vertical position)
Oil venting hole