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9.7.2
Which repair work is allowed to be
carried out
9.7.3
Changing the hydraulics housing
Fig. 26: Changing the hydraulics housing
56
Maintenance and repair
▪ 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.
1
Hexagon nuts for fixation of the motor/hydraulics
2
Hydraulics housing
1
3
Threaded bolt
‡
Lifting equipment with sufficient bearing capacity is present.
‡
Protective equipment has been put on.
‡
New hydraulics housing is ready.
‡
Impeller must not be dismantled!
1. Attach lifting equipment with suitable lifting gear to the attachment point of the pump.
2. Place the pump upright.
CAUTION! If the pump is placed down too quickly, the hydraulics housing at the suc-
3
tion port can be damaged. Place the pump down slowly on the suction port!
NOTICE! If the pump cannot be placed level on the suction port, use appropriate ad-
2
justment plates. In order for the motor to be lifted without any problem, the pump
must be vertical.
3. Mark the motor/hydraulics position on the housing.
4. Loosen and remove hexagon nuts on the hydraulics housing.
5. Slowly lift the motor and pull it off the threaded bolts.
CAUTION! Lift the motor vertically and do not tilt! The threaded bolts will be dam-
aged if tilted!
6. Swivel the motor over the new hydraulics housing.
7. Slowly drain the motor. Make sure that the motor/hydraulic markings match and the
thread the threaded bolts exactly into the drilled holes.
8. Screw hexagon nuts and connect the motor to the hydraulics firmly. NOTICE! Observe
the tightening torques in the appendix!
▶ Hydraulics housing changed. Pump can be reinstalled.
WILO SE 2019-01
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