General Overhaul; Repairs - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

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Fig. 11: Sealing chamber: Oil change
9.5.8

General overhaul

9.6

Repairs

Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Maintenance and repair
WARNING
Scalding due to hot operating fluids!
When the pressure escapes, hot operating fluid can also be ejected. This can result in
scalding! To avoid injuries, the following instructions must be observed:
• Allow the mixer to cool to ambient temperature, then open the screw plugs.
• Wear closed safety goggles or face protection as well as gloves.
+ Add the oil to the sealing chamber
- Drain the oil in the sealing chamber
‡
Protective equipment has been put on!
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Pump is removed and cleaned (if necessary decontaminated).
1. Place the pump upright on a firm surface.WARNING! Risk of hands being crushed.
Make sure that the pump cannot fall over or slip!
2. Place a suitable tank to collect the operating fluid.
3. Unscrew the screw plug (+) slowly, but do not unscrew it completely. WARNING! Over-
pressure in the motor! If you hear hissing or whistling sounds, do not turn any fur-
ther! Wait until the pressure has fully dissipated.
4. After the pressure has dissipated, fully unscrew the screw plug (+).
5. Unscrew screw plug (-) and allow the operating fluid to drain out. If a shut-off ball cock
is installed on the outlet opening, open the shut-off ball cock.
6. Check operating fluid: If there are metal filings in the operating fluid, inform customer
service!
7. If a shut-off ball cock is installed on the outlet opening, close the shut-off ball cock.
8. Clean the screw plug (-), replace the seal ring and screw it back in. Max. tightening
torque: 8 Nm (5.9 ft·lb)!
9. Pour the new operating fluid in through the hole of the screw plug (+).
⇒ Adhere to the information for operating fluid type and quantity!
10.Clean the screw plug (+), replace the seal ring and screw it back in. Max. tightening
torque: 8 Nm (5.9 ft·lb)!
During the general overhaul, the motor bearings, shaft seals, O-rings and power supply ca-
bles are checked for wear and damage. Damaged components are replaced with original
parts. This will ensure correct operation.
The general overhaul is performed by the manufacturer or an authorized service center.
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction port. There is a danger of limbs being
severed! Protective gloves must be worn against cutting injuries.
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