General Overhaul; Faults, Causes And Remedies - Wilo -Padus PRO M08L/T039-540/A Einbau- Und Betriebsanleitung

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Fig. 7: Sealing chamber: Oil change
9.5.6

General overhaul

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Faults, causes and remedies

Installation and operating instructions Wilo-Padus PRO
Faults, causes and remedies
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.
1 Sealing chamber screw plugs
The pump has two screw plugs for the sealing chamber. The operating fluid is drained
through one screw plug. The other screw plug is used to vent the sealing chamber.
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Protective equipment must be worn!
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Pump has been dismantled and cleaned (decontaminated if required).
1. Position the pump horizontally on a firm surface. The screw plug points upwards.
WARNING! Risk of hands being crushed. Make sure that the pump cannot fall
over or slip!
2. 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.
3. After the pressure has dissipated, completely unscrew the screw plug.
4. Position a suitable reservoir to collect the operating fluid.
5. Drain the operating fluid: Rotate the pump until the opening points downwards.
Unscrew the second screw plug for venting.
6. Check the operating fluid: Notify customer service if the operating fluid contains
metal swarf!
7. Clean the venting screw plug, replace the seal ring and screw the screw plug in
again. Max. tightening torque: 8 Nm (5.9 ft·lb)!
8. Pour in operating fluid: Rotate the pump until the opening points upwards. Pour
the operating fluid into the opening.
⇒ Comply with the specifications for the operating fluid type and quantity!
9. 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.
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