Maintenance and repair
en
Installation and operating instructions Wilo-Flumen OPTI-TR 20-1, 22, 28-1, 30-1, 40-1, Wilo-Flumen EXCEL-TRE 20, 30, 40
75
The following preconditions must be met prior to starting repair work:
ƒ
Wear protective equipment! Observe the work regulations.
–
Safety shoes: Protection class S1 (uvex 1 sport S1)
–
Protective gloves: 4X42C (uvex C500)
–
Safety goggles: uvex skyguard NT
For detailed marking of frame and disc, see the section on “Personal protective
equipment [
}
46]”.
ƒ
The mixer has been thoroughly cleaned and disinfected.
ƒ
Motor must have cooled down to the ambient temperature.
ƒ
Workplace:
–
Clean, good lighting and ventilation.
–
Firm and stable work surface.
–
Secured against falling over and slipping.
CAUTION! Do not set the mixer down on the propeller! Provide an appropriate plat-
form.
NOTICE! Only carry out the repair work described in these installation and operating
instructions.
For repair work, the following applies:
ƒ
Wipe up spillage quantities of fluid and operating fluid immediately!
ƒ
Always replace O-rings, gaskets and screw locking devices!
ƒ
Observe the tightening torques in the appendix!
ƒ
The use of force is strictly prohibited!
9.6.1
Instructions on using screw lock-
ing devices
A screw locking device can be used on the screws. Screw locking is done at the factory
using two different methods:
ƒ
Thread-locking fluid
ƒ
Mechanical screw locking device
Always re-apply the screw locking device!
Thread-locking fluid
Medium-strength thread-locking fluid (e.g. Loctite 243) is used for the liquid screw
locking compound. This threadlocker can be loosened with increased force. If the
thread-locking fluid cannot be loosened, then the compound must be heated to ap-
prox. 300 °C (572 °F). Clean the components thoroughly after dismantling.
Mechanical screw locking device
The mechanical screw locking device consists of two Nord-Lock wedge lock washers.
The screw connection is secured by a clamping force.
9.6.2
Which repair work may be carried
out
ƒ
Propeller replacement
ƒ
Replacement of mechanical seal on the fluid side.
ƒ
Replacement of the frame.
ƒ
Replacement of the mounting bracket for ground installation.
9.6.3
Propeller replacement
1
2
3
4
Fig. 13:
Propeller replacement
1
Propeller
2
Propeller attachment: Interior hexagonal head screw and washer
3
Shaft
4
Mechanical seal
‡
Mixer set down on a firm surface and secured.
‡
Tools are ready for use.
1. Loosen and unscrew the propeller attachment.
NOTICE! Fix the propeller in place
with suitable equipment.
2. Carefully remove the propeller from the shaft.
CAUTION! The mechanical seal is
now no longer secured. Only operate the mixer with the propeller! If the mixer
is operated without the propeller, the mechanical seal will be destroyed. If the
mechanical seal is faulty, oil escapes from the sealing chamber.
3. Clean the shaft and apply new lubricating grease.
4. Carefully slide the propeller back on as far as it will go.
