Maintenance
7-10
WILO EMU 3.0
Version 2
1
Unscrew the fastening for the intake port from the pump housing.
2
Remove the intake port from the pump housing and place it on a secure base.
3
Fasten the impeller with suitable equipment, loosen and remove the fastening screw. Pay
attention to the locking screw.
4
Remove the impeller from the shaft using a suitable extractor.
5
Clean the shaft.
6
Attach a new impeller to the shaft. Make sure that the sliding surfaces do not become dam-
aged.
7
Apply a new screw fixing to a new fastening bolt and screw it into the shaft. Fasten the
impeller and tighten the fastening screw with the correct torque (see table).
8
Attach the intake port to the pump housing and secure it. It must be possible to turn the
impeller by hand.
Changing the stationary and
mobile wear ring
The stationary and mobile wear ring determine the gap between the impeller (mobile wear ring) and
the intake port (stationary wear ring). If this gap is too big, the performance of the machine
decreases, and/or it can lead to entanglements. Both rings are designed so that they can be
replaced. This minimizes wear on the intake port and and impeller, consequently reducing expense
for spare parts.
The correct manual for changing the mobile and stationary wear rings is
supplied with the replacement part.
Changing sealing parts
Changing sealing parts such as the block seal cartridge and the mechanical seal shaft requires a
certain amount of specialist knowledge about these sensitive components. In addition to this, in
order to carry out the work, much of the machine must be dismantled.
These parts are checked and changed during the general overhaul which is carried out by the man-
ufacturer.
Torque values
Overview of the correct torques for dacromet-coated screws with Nord-Lock screw fixing
Overview of the correct torques for rustproof screws without screw fixing:
Thread
Tensile strength 10.9
Nm
kp m
M5
9.2
0.94
M6
15.0
1.53
M8
36.8
3.75
M10
73.6
7.50
M12
126.5
12.90
M16
316.3
32.24
M20
621.0
63.30
M24
1069.5
109.02
M27
1610.0
164.12
M30
2127.5
216.87
Table 7-3: Dacromet-coated screws with Nord-Lock screw fixing
Thread
Nm
kp m
Thread
Nm
kp m
M5
5.5
0.56
M16
135.0
13.76
Table 7-4: Rustproof screws without Nord-Lock screw fixing
