Repair
64
WBV.PU.002.EN VX215QD V2.0
9.6
Change of cartridge mechanical seal
9.6.1
Change of cartridge mechanical seal on the gearbox
Cartridge mechanical seal
– installation/disassembly tool: Part no. PBA0082
Alternatively
:
Combination tool for lobe change
and
cartridge mechanical seal change
for pump sizes 226, 320: Part no. PBA0081
Fig.
“Cartridge mechanical seal on the gearbox”
1.
Reduce the pressure in the two buffer chambers if necessary
Chap.
“Buffer chamber”.
2.
Drain and clean the buffer chamber on the gearbox.
3.
If present, dismount the locking screws or flushing connectors for the circulation system
Chap.
“Circulation system on the cartridge mechanical seal” and
Fig.
“Flushing operation”.
4.
Drain gear oil.
5.
Follow the steps specified in
Chap.
“Lobe change” and
Chap.
“Wear plate change”.
6.
Remove the slotted set screws (1) of the cartridge mechanical seal (Fig. a)).
7.
Put on tool (A) and screw the cylinder head bolts (2) into the extracting boreholes of the cartridge
mechanical seal (Fig. b)).
8.
Pull out the cartridge mechanical seal evenly using the three hexagon head bolts (3) of the tool (A)
(Fig. b)).
9.
Change O-ring (4) in the bearing seal housing (Fig. c)).
10.
Before installing the new cartridge mechanical seal, carefully remove the burrs on the keyways and
clean the cartridge mechanical seal seat in the pump housing.
11.
Push new cartridge mechanical seal onto the shaft. Carefully oil the outer O-rings on the seal carrier
(pos. 5 in Fig. b)) before installation. Attention! Do not use mineral oil or grease for O-rings made of
EPDM. Use glycol as an alternative.
12.
If a circulation system is present, the flushing connector boreholes in the cartridge mechanical seal
must be aligned with the flushing connector boreholes in the bearing seal housing.
13.
To install the new cartridge mechanical seal, place the tool on the cartridge mechanical seal without
bolts.
14.
Push lobe (without fitting key) onto the shaft.
15.
Insert the pressure disc and the strain bolt.
16.
Tighten the lobe until the cartridge mechanical seal is flush with the pump housing.
17.
Reinstall any removed locking screws or flushing connectors.
18.
Remove the lobe again.
19.
Push O-ring and support ring onto the shaft.
20.
Before installing the lobes, thoroughly clean the contact surfaces of the lobes and gasket!
21.
Install lobes, wear plates and QD cover.
22.
Top up buffer or quenching fluid.
23.
Readjust the pressure in the two buffer chambers if necessary
Chap.
“Buffer chamber”.
24.
Top up the gear oil.
