11/19NT 1003-E00 09.12 AK O - AK I e
5. MECHANICAL SEALS (continued)
After opening the pump (see § 4.) :
To remove a taper lock shaft coupling
1. Dismantle the coupling of the pump.
For the standard coupling supplied by MOUVEX, loo-
sen the hexagonal socket head screws, and by repla-
cing one of them in the slot provided for this purpose to
release the tapered lock bushing.
For any other coupling, please refer to the supplier's
instructions.
2. Remove the shaft key 508.
To remove the bearing cover 705
1. Unscrew the screws 706 and washers 721.
2. Remove the bearing cover 705.
3. Check the condition of the lip seal 707.
To dismantle the front cover 401 of the pump (please
consider also to § 4.1)
1. Loosen the bolts 409 and nuts 409a.
2. Remove the front cover 401.
3. Remove the seal 403 and check its condition.
If the front cover does not easily separate, tap it lightly
with a plastic mallet to separate it progressively.
4. Extract the piston 301 (please also consider § 4.2).
To dismantle the bearing 703
1. Remove the circlip 704 using circlip pliers or a screw-
driver, taking care not to damage it.
2. Remove the washer 731.
3. Remove the shaft 501 from the bearing 703 by tapping
it lightly with the plastic mallet on the drive side of the
pump. Hold the shaft 501 firmly during dismantling.
4. Remove the protection circlip 733.
To dismantle the bearing cage 701
1. Separate the bearing cage 701 by tapping it with a
plastic mallet.
2. Remove the bearing cage seal 717 and check its condition.
To dismantle the complete stationary part 610 of the
mechanical seal
1. Remove the stationary part of the mechanical seal 604
2. Remove the 'O' ring 605 from the holder and check its
condition.
To dismantle the rotating part 697
1. Remove the rotating part 697 from the shaft 501, taking
care not to scratch it (especially in the case of FEP
encapsulated 'O' rings. Check the condition of shaft sur-
face, rub it down with emery paper No 320 if scratched).
5.3 Assembly
Assembly of the rotating part 697
1. Mount the rotating part 697 on the shaft 501 (with the
assembly cone for the FEP 'O' rings) taking care not to
scratch the shaft (extremely important in the case of
the assembly of FEP 'O' rings. Check the condition of
the shaft surface, rub it down with emery paper No320
if scratched). Align the 2 lugs of the rotating part 697
with the 2 grooves on the shaft 501.
2. Clean the seal surface on the rotating part with a soft
cloth if it is dirty. Be careful not to scratch the surface
of the seal.
To assemble the complete stationary part 610 of the
mechanical seal
1. Clean the 'O' ring groove in the bearing cage 701.
2. Locate the 'O' ring 605 in the bearing cage 701.
3. Place the stationary part of the seal 604 in the bearing
cage 701, taking care to align the pin located in the rol-
ling bearing cage 701 with the groove on the stationa-
ry part of the seal 604.
4. Clean the surface of the seal with a soft cloth if it is
dirty. Be careful not to scratch the surface of the seal.
Assembly of bearing 703
1. Place the protection washer 733 in the bearing cage
701.
2. Position the shaft 501 with the rotating part 697 in the
bearing cage 701 with the washer 733.
Be careful not to knock the 2 surfaces of the seals.
3. Position the bearing 703 on the end of the shaft 501.
Tap the shaft lightly with a plastic mallet (NOT THE
PUMP DRIVE END).
4. Place the shaft 501 drive end up in a vice, resting on
the bearing cage 701, and tap on the inside of the bea-
ring 703 with the tube (the tube willl have an internal
diameter slightly larger than the internal diameter of the
ball bearing) and the plastic mallet until you see the cir-
clip groove 704 on the shaft. Be careful not to damage
the seal (tap lightly on the tube).
5. Assemble the washer 731 and the circlip 704 on the
shaft 501.
NOTICE : We recommend the use of a hand press.
Remounting the piston 301
Assembly of front cover 401
1. Clean the seal housing 403 and mount the seal 403.
2. Replace the front cover 401, taking care that the pis-
ton guide block is well assembled in its housing taking
care not to damage the seal 403.
3. Tighten the bolts 409 with the nuts 409a.
To assemble the rolling bearing cage 701
1. Clean the cage seal 717.
2. Assemble the cage seal 717 on the bearing cage 701.
3. Position the shaft 501 in the pump.
4. Fill the bearing 703 with grease (see § MAINTENANCE).
5. Reassemble the cover 705, grease the lip of the lip
seal 707 to ease assembly.
6. Replace the screws 706 and their washers 721.
697 comprising:
612
613
614
615
616
610 comprising:
604
605