Atlas Copco JS Serie Instructions Pour L'utilisation Et L'entretien page 17

13.1 Inspection and checks
Check from time to time that the pump is working correctly. Use the instruments mounted in the system (pressure gauge, vacuum gauge,
ammeter, etc.) to see if the pump continues to meet its duty.
Periodic maintenance of the parts subject to wear, in particular, the impeller and wear plate, is recommended.
13.2 Replacing the impeller (fig. 10)
- Drain the pump casing as described in paragraph 7.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
- Unscrew the nuts (52) and remove the pump casing, taking care not to damage the casing gasket (43)
- Block the impeller (03) and unscrew the self-locking impeller nut (33)
- Remove the impeller and replace it with a new one
- If necessary, replace the casing gasket (43)
- To reassemble, proceed in reverse order.
- Check that the distance between the impeller and the front wear plate as described in paragraph 13.7
13.3 Replacing the wear plate (fig. 10)
- Drain the pump casing as described in paragraph 7.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
- Unscrew the nuts (52) and remove the pump casing, taking care not to damage the casing gasket (43)
- Unscrew the wear plate screws (57)
- Remove and replace the wear plate (02)
If necessary, replace the casing gasket (43)
- To reassemble, proceed in reverse order
- Check that the distance between the impeller and the front wear plate as described in paragraph 13.7
13.4 Replacing the check valve (fig. 10)
- Drain the pump casing as described in paragraph 7.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
- Remove the nuts (52.1)
- Slip off the suction flange (10)
- Slip off the check valve (14.1)
- Mount the new check valve with the hinge towards the top
- Clean the valve seat of the suction flange (10) and reassemble it
- Some check valves have a tongue which protrudes outside the suction flange. In this case, the weight of the check valve must be borne
while tightening the nuts by pulling this tongue
13.5 Replacing the mechanical seal type 1 - 2 - 3 (figs. 10, 11, 12)
- Drain the pump casing as described in paragraph 7.
Attention: residual liquid may be found inside the pump casing, head and suction
line; take all necessary precautions if the liquid is hazardous (inflammable, corrosive,
poisonous, infected, etc.)
- Remove the nuts (52) and remove the casing (01).
- Block the impeller (03) and remove the self-locking impeller nut (33)
- Remove the impeller
- Remove the head (19). The rotating part of the seal (40) mounted on the shaft sleeve
(31) will slide off the shaft together with the head
- Remove the stationary seat (39) and its gasket (38) from the head
- Remove the lip seal (41)
- Wash the head with solvent to remove any residue of grease and clean the seats of the
stationary seal and lip seal thoroughly
- Mount a new lip seal in the head. To facilitate assembly, smear a little oil on the seat and
on the outer surface of the lip seal
- Mount the stationary portion of the seal (39) together with its gasket (38). To facilitate
this operation, wet the seat on the head and the gasket with methylated spirits. If
necessary, use a wooden plunger or similar to push the stationary seal (39) into its seat
- Reassemble the head taking care not to touch the shaft with the stationary seal
seat. If this is ceramic, it could easily break or chip
- Tighten the head screws (45) and nuts (45.1)
- Smear the gasket of the rotating seal seat (40) and the shaft sleeve (31) with oil and slip
the seal on to one end of the shaft sleeve
- Slip the sleeve and seal on to the shaft and push to overcome the slight resistance
offered by the lip seal. Take care that the seal does not slip off the shaft sleeve.
- Mount the seal support ring (25.1). Push this forward until it is possible to reassemble
the impeller key (60)
- Reassemble the impeller (03), the impeller washer (66) and tighten the impeller nut (33)
- Check that the distance between the impeller and the front wear plate as described in paragraph 13.7
- Reassemble the casing gasket (43) after smearing both sides with grease
- Reassemble the casing and tighten the nuts, checking that the impeller is free to rotate
- Fill the seal lubrication chamber (see paragraph 12.1.1, 12.1.2) with grease.
/ JS
JS / JP / JE / JO / JT
www.northridgepumps.com
fig. 11
fig. 12
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