7 Servicing/Maintenance
50 of 60
Sewabloc
0,4
+0
,2
m
m
914.12
412.34
914.24
135
412.33
230
101
Fig. 19:
Fitting the wear plate
1. Equip wear plate 135 with two new O-rings 412.33/34.
2. Insert wear plate 135 into pump casing 101.
3. Fasten wear plate 135 to pump casing 101 with hexagon socket head cap screws
914.12.
4. Adjust the clearance between impeller 230 and wear plate 135 by loosening and
tightening screws 914.12 and 914.24.
ð
Screw 914.24 presses the wear plate in the direction of the impeller.
ð
The clearance equals 0.4
+0.2
mm (measured on the suction side from the
outer surface of the impeller vane to the wear plate).
5. Insert the complete back pull-out unit into the pump casing.
6. Evenly tighten screwed connection 920.01 between pump casing and bearing
bracket.
7.5.6 Leak test
After reassembly of the pump, subject the mechanical seal area/lubricant reservoir to
a leak test.
1. Tightly screw the testing device into the filler opening (auxiliary connection
13D).
2. Test medium: Compressed air
Test pressure: Max. 0.8 bar
Test period: 2 min
ð
The pressure must not drop during the test period.
ð
If the pressure does drop, check the seals and screwed connections. Then
perform another leak test.
3. Once the leak test has been successful, fill in the lubricant.
7.6 Tightening torques
Table 21:
Tightening torques [Nm]
Thread
(A4-70 / 1.4462)
M 6
7
M 8
17
M 10
35
M 12
60
M 16
150
M 20
290
M 24
278 / 500
M 27
409 / 736
M 30
554 / 1000
Содержание Sewabloc Series
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