Oil Change In Sealing Chamber; General Overhaul - Wilo HC 20.1 + EMU FA Serie Manual De Instrucciones

9.5.7

Oil change in sealing chamber

+
-
Fig. 11: Sealing chamber: Oil change
9.5.8

General overhaul

Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Maintenance and repair
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up in the motor! This pressure escapes when the
screw plugs are opened. If screw plugs are opened without due caution, they can be
ejected at high speed! To avoid injuries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew the screw plugs slowly, but never unscrew them completely. As soon
as the pressure escapes (audible whistling or hissing of air), stop turning the
screw plug any further!
• When the pressure has completely dissipated, fully unscrew the screw plugs.
• Wear closed safety goggles.
WARNING
Scalding from hot operating fluids!
Hot operating fluids can also spray out when pressure is released. This can result in
scalding! To avoid injuries, the following instructions must be observed:
• Allow the motor to cool down to the ambient temperature before opening the
screw plugs.
• Wear closed safety goggles or face protection and gloves.
+ Add the oil to the sealing chamber
- Drain the oil in the sealing chamber
‡
Protective equipment has been put on!
‡
Pump has been dismantled and cleaned (decontaminated if required).
1. Place the pump upright on a firm surface.WARNING! Risk of hands being crushed.
Ensure that the pump cannot fall over or slip away!
2. Place a suitable tank to collect the operating fluid.
3. Unscrew the screw plug (+) slowly, but do not unscrew it completely. WARN-
ING! Overpressure in the motor! Stop turning the screw plug further if hissing
or whistling is audible! Wait until the pressure has completely dissipated.
4. After the pressure has dissipated, fully unscrew the screw plug (+).
5. Unscrew screw plug (-) and drain the operating fluid. If a shut-off ball cock is in-
stalled on the outlet opening, open the shut-off ball cock.
6. Check the operating fluid: Notify customer service if the operating fluid contains
swarf!
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 (+).
⇒ Comply with the specifications 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 sealings, O-rings and power
supply cables 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 authorised service centre.
en
185