en
Maintenance and repair
38
WILO SE 2017-06
WARNING
Hand, foot or eye injuries due to lack of protective equipment!
Danger of (serious) injuries during work. Wear the following protective equipment:
• Safety gloves against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled 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:
▪ Immediately wipe up drips!
▪ Always replace O-rings, gaskets and screw locking devices!
▪ Observe the tightening torques in the appendix!
▪ Never use force when carrying out this work!
9.7.1
Instructions on using screw lock-
ing devices
All screws are equipped with a screw locking device. There are two different ways to
tighten the screw locking device:
▪ Thread-locking fluid
▪ Mechanical screw locking device
Always replace 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
threadlocker cannot be loosened, the connection must be heated to approx. 300 °C.
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!
9.7.2
Which repair work may be carried
out
▪ Changing the hydraulics housing.
▪ SOLID G impeller: Readjusting the suction port.
9.7.3
Changing the hydraulics housing
NOTICE
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.
