Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento página 42

en-US
9.6.1 Instructions on using screw lock-
ing devices
9.6.2 Which repair work is allowed to be
carried out
9.6.3 Changing the hydraulics housing
42
Maintenance and repair
WARNING
Hand, foot or eye injuries due to a lack of protective equipment!
During work there is a risk of (serious) injury. Wear the following protective equipment:
• Safety gloves that protect against cuts
• Safety shoes
• Closed safety goggles
The following preconditions must be met prior to starting repair work:
▪ Pump cooled down to the ambient temperature.
▪ Pump is switched voltage-free and secured against being activated inadvertently.
▪ Pump cleaned thoroughly and disinfected (if required).
For repair work the following generally 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!
▪ Never use force when carrying out this work!
A screw locking method can be used on the screws. Ex-factory, the screws are locked using
two different methods:
▪ Thread-locking fluid
▪ Mechanical screw locking device
Always replace the screw locking device!
Thread-locking fluid
When using thread-locking fluid, opt for a medium-strength product (e.g. Loctite 243). This
type of compound can be loosened with increased force. If the screw cannot be loosened,
then the compound must be heated to approx. 300 °C (572 °F). Clean the components thor-
oughly after dismantling.
Mechanical screw locking
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
must only be used on bolts with strength class 10.9 which have been coated with Geomet.
The use of stainless screws is prohibited!
▪ Changing the hydraulics housing.
▪ SOLID G- and Q impeller: Readjusting the suction port.
DANGER
Dismantling the impeller is prohibited!
Depending on the impeller diameter, the impeller must be removed for dismantling the
hydraulics housing on some pumps. Before carrying out any work, check whether dis-
mantling the impeller is necessary. If yes, notify customer service! The dismantling of the
impeller must be carried out by customer service or an authorized specialist workshop.
WILO SE 2019-01