Wilo HC 20.1 + EMU FA Serie Manual De Instrucciones página 186

en
9.6 Repairs
9.6.1 Instructions on using screw lock-
ing devices
9.6.2 Which repair work may be carried
out
9.6.3 Changing the hydraulics housing
186
Maintenance and repair
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction port. There is danger of limbs be-
ing severed! Protective gloves must be worn to protect from cuts.
WARNING
Hand, foot or eye injuries due to the absence of protective equipment!
Danger of (serious) injuries during work. Wear the following protective equipment:
• Safety gloves for protection 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 device can be used on the screws. Screw locking is done at the factory
using 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 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 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
dismantling the impeller is necessary. If yes, notify customer service! The dismant-
ling of the impeller must be carried out by customer service or an authorized special-
ist workshop.
WILO SE 2019-01