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Installation and operating instructions • Wilo-Rexa PRO-S • Ed.01/2022-03
⇒
Operating fluid milky/cloudy: Water in oil. Minor leakage through the mechanical seal
is normal. If the ratio of oil to water is less than 2:1, the mechanical seal may be dam-
aged. Change the oil and check again four weeks later. If water is again present in the
oil during the second check, contact customer service!
⇒
Metal chips in the operating fluid: Contact the customer service!
8.
Pour in operating fluid: Rotate the pump until the opening points upwards. Pour the op-
erating fluid into the opening.
⇒
Comply with the specifications for the operating fluid type and quantity!
9.
Clean the screw plug, replace the seal ring and screw it back in.
Max. tightening torque:
8 Nm (5.9 ft·lb)!
9.5.7
General overhaul
During the general overhaul, the motor bearings, shaft sealings, O-rings and connection
cables are checked for wear and damage. Damaged components are replaced with original
parts. This ensures correct operation.
The general overhaul is performed by the manufacturer or an authorised service centre.
9.6
Repairs
WARNING
Risk of injury from sharp edges on the cutting device!
The macerator has extremely sharp edges. In addition, sharp edges can
form on the suction port. There is a danger of cuts!
• Wear protective gloves!
• Do not touch the macerator!
The following preconditions must be met prior to starting repair work:
•
Wear protective equipment! Observe the work regulations.
–
Safety shoes: Protection class S1 (uvex 1 sport S1)
–
Protective gloves: 4X42C (uvex C500 wet)
–
Safety goggles: uvex skyguard NT
For detailed marking of frame and disc, see the section on “Personal protective equip-
ment [
•
The pump has been thoroughly cleaned and disinfected.
•
Motor must have cooled down to the ambient temperature.
•
Workplace:
–
Clean, good lighting and ventilation.
–
Firm and stable work surface.
–
Secured against falling over and slipping.
NOTICE! Only carry out the repair work described in these installation and operating in-
structions.
For repair work, the following applies:
•
Wipe up spillage quantities of fluid and operating fluid immediately!
•
Always replace O-rings, gaskets and screw locking devices!
•
Observe the tightening torques in the appendix!
•
The use of force is strictly prohibited!
9.6.1
Instructions on using screw locking
devices
A screw locking device can be used on the screws. Screw locking is done at the factory us-
ing two different methods:
•
Thread-locking fluid
•
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 approx. 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 the clamping force. The Nord-Lock screw locking device
