Wilo Atmos TERA-SCH Serie Einbau- Und Betriebsanleitung Seite 40

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Fig. 28: Location of mechanical seal on shaft
Pump Mechanical seal without sleeve
Seal diameter
(Ø dw)
[mm]
35
SCH 150-230
65
SCH 150-555
45
SCH 200-320
65
SCH 200-500
45
SCH 250-360
65
SCH 250-380
65
SCH 250-470
65
SCH 300-430
65
SCH 350-500
70
SCH 400-490
70
SCH 400-550
Table 17: Table for Mechanical Seal Adjustment
9.7.2 Reassembly of the pump
40
Maintenance/repair
ƒ
Insert O-ring (35) in between shaft (22) and sleeve (34) and ensure its proper posi-
tioning.
ƒ
Screw in the sleeve nut (36) but do not tighten it now, keep it loose.
Mechanical seal version without sleeves
ƒ
Place the impeller key (14) at its seat on the shaft (24).
ƒ
Slide the impeller (21) at its position on the shaft (24), matching the marked position
done while disassembly.
ƒ
Place the wear rings (25) on the impeller (21).
ƒ
Screw in the impeller nut (36) but do not tighten it now, keep it loose.
Reassembly of mechanical seal itself
Extreme cleanliness must be observed during installation. Damage to the seal faces and
mounting rings must be avoided. Never cover the sliding faces with a lubricant as
they must be assembled dry, clean, and dust-free! Drive pins must be replaced
whenever the seal is dismantled!
O-rings may be lubricated to reduce friction, during installation of the seal. EP-rubber
O-rings must not come into contact with oil or grease. In this case, lubrication with gly-
cerine or water is recommended.
1 Pump housing
3 Stationary seat
5 O-ring
X Mechanical seal
1.7 Abutment ring fixing screw
ƒ
Place the adjusting ring of mechanical seal at its pre-marked position.
ƒ
Place the grab screw (13) at its position on the adjusting ring, but do not tighten it
now, keep it loose.
ƒ
When pressing in stationery seats, make sure that the pressure distribution is uni-
form. Use plenty of water or alcohol as lubricant. If necessary, use a mounting
sleeve.
ƒ
Check that the stationary seal ring is seated at right angles.
For rest parts follow the similar procedure as per gland pack version pump:
ƒ
Place mechanical seal covers (7); followed by water thrower (6) on both sides.
ƒ
Slide the bearing inner covers (5, 30) on either side of the shaft (24).
ƒ
Place supporting rings (4).
ƒ
Place the bearings (3) at the shaft ends using proper mounting aid.
ƒ
Press the bearing housings (2, 33) over the bearings (3) using a mallet.
Distance on the shaft (L)
[mm]
MG1 MG74
28.5 31
40 37.5
30 31
40 37.5
30 31
40 37.5
40 37.5
40 37.5
40 37.5
40 42
40 42
Ensure that housing is clean, dry, and free from foreign matter. Clean housing wear ring
thoroughly and ensure that they have no burrs.
2 Stationary seat
4 Gland plate
6 Shaft
1.6 Abutment ring
Mechanical seal with sleeve
Seal diameter Distance on the shaft (L)
(Ø dw)
[mm]
[mm]
MG1
55 35
85 41
65 40
85 41
65 40
85 41
85 41
85 41
85 41
90 45
90 45
MG74
32.5
41.8
37.5
41.8
37.5
41.8
41.8
41.8
41.8
46:8
46:8
WILO SE 2020-10