Desmi ESLH/-17, Operation And Maintenance Instructions, Page: 15 / 19

_______________________________________________________________________________
DESMI Pumping Technology A/S
15
www.desmi.com
Tagholm 1
9400 Nørresundby
– Denmark
Tel: +45 96 32 81 11 Fax: +45 98 17 54 99
E-mail:
desmi@desmi.com
point screw, then the sealing element itself can now be pulled off the shaft.
Dismantle the top piece from the ball bearing to permit pressing from the back with a pair of
screwdrivers or the like under the collar off the seat.
Clean the bore for seat and shaft thoroughly of dirt and rust. Remove persistent coatings, if
any, by grinding the shaft lightly with very fine emery cloth.
Grease the new seat ring and the inserted O-ring well with glycerine
– not oil – and press it
into place in the casing. Check that the seat is fitted correctly by knocking lightly with a piece
of wood. The seat ring is to be treated very carefully to prevent the sliding surface from being
scratched.
It is necessary to use a conical bush as shown below to prevent the rubber bellows from being
damaged during mounting.
Grease the back of the carbon ring with glycerine to ensure that it stays in its correct place
during the mounting. Grease the shaft, the conical bush and the rubber bellows amply with
glycerine.
And If it is necessary to use plastic tape to help shaft seal get through the slide bearing
rough surface area on the shaft.
Press the shaft seal on to the shaft until it resists. Press the driving ring only,
Finally It has to be made sure the length from shaft seal end to bearing house flange being
within 44 +/- 0.5mm of the nominal length. And lock it with the pointed screw.
The ELK shaft seals must be turned after installation ... so O-rings, springs and sliding
surfaces can slip into right placement before pressure testing. This is done by mounting the
seal as described and later turn the shaft about 10 revolutions - with water in the pump - but
without adding pressure. Then pressure test the pump as normally done.
12.5
REPLACING BALL BEARINGS
The bearings are dimensioned for a nominal life of 100,000 operating hours and is to be
relubricated according to the following table. Bearings must be replaced in case of noise or
bearing wear.
The bearings must be re-lubricated through the lubrication nipples (32) mounted on the outside
of the bearing house console (15) according to the table below. When replaced, fill the
bearings with grease and place a fat tumour on top of the shaft in a quantity corresponding to
the chart below. The high-temperature grease SKF LGHP2 is recommended.
Pump Assembly Interval Quantity
ESLH25-180N Ball bearing housing 4500 hours 15 g
If the ball bearing is to be replaced, it is necessary to disassemble the pump and dismantle
the pump shaft (as described in paragraph 5.1.3):