zh-CHS
Maintenance/repair
86
WILO SE 2020-10
ƒ
Insert O-ring (35) in between shaft (22) and sleeve (34) and ensure its proper
positioning.
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
glycerine or water is recommended.
Fig. 28:
Location of mechanical seal on shaft
1
Pump housing
2
Stationary seat
3
Stationary seat
4
Gland plate
5
O-ring
6
Shaft
X
Mechanical seal
1.6
Abutment ring
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
uniform. 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.
Pump
Mechanical seal without sleeve
Mechanical seal with sleeve
Seal diameter
(Ø dw)
[mm]
Distance on the shaft (L)
[mm]
Seal diameter
(Ø dw)
[mm]
Distance on the shaft (L)
[mm]
MG1
MG74
MG1
MG74
SCH 150-230
35
28.5
31
55
35
32.5
SCH 150-555
65
40
37.5
85
41
41.8
SCH 200-320
45
30
31
65
40
37.5
SCH 200-500
65
40
37.5
85
41
41.8
SCH 250-360
45
30
31
65
40
37.5
SCH 250-380
65
40
37.5
85
41
41.8
SCH 250-470
65
40
37.5
85
41
41.8
SCH 300-430
65
40
37.5
85
41
41.8
SCH 350-500
65
40
37.5
85
41
41.8
SCH 400-490
70
40
42
90
45
46:8
SCH 400-550
70
40
42
90
45
46:8
表 17:
Table for Mechanical Seal Adjustment
9.7.2
Reassembly of the pump
Ensure that housing is clean, dry, and free from foreign matter. Clean housing wear ring
thoroughly and ensure that they have no burrs.
