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6 Maintenance
6 Maintenance
Precautions
Before starting work, make sure that the safety instructions in the chap-
ter
Introduction and Safety
on page 2 have been read and understood.
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and
lock out power before servicing to prevent unexpected start-
up. Failure to do so could result in death or serious injury.
WARNING: Biological Hazard
Infection risk. Rinse the unit thoroughly with clean water be-
fore working on it.
CAUTION: Crush Hazard
Make sure that the unit cannot roll or fall over and injure peo-
ple or damage property.
Make sure that you follow these requirements:
• Check the explosion risk before you weld or use electrical hand
tools.
• Allow all system and pump components to cool before you handle
them.
• Make sure that the product and its components have been thor-
oughly cleaned.
• Make sure that the work area is well-ventilated before you open any
vent or drain valves, remove any plugs, or disassemble the unit.
• Do not open any vent or drain valves or remove any plugs while the
system is pressurized. Make sure that the pump is isolated from the
system and that pressure is relieved before you disassemble the
pump, remove plugs, or disconnect piping.
Ground continuity verification
A ground (earth) continuity test must always be performed after serv-
ice.
Maintenance guidelines
During the maintenance and before reassembly, always remember to
perform these tasks:
• Clean all parts thoroughly, particularly O-ring grooves.
• Change all O-rings, gaskets, and seal washers.
• Lubricate all springs, screws, O-rings with grease.
During the reassembly, always make sure that existing index markings
are in line.
The reassembled drive unit must always be insulation-tested and the
reassembled pump must always be test-run before normal operation.
12
6.1 Change the coolant
This image shows the plug that is used to change the coolant.
6.1.1 Empty the coolant
CAUTION: Compressed Gas Hazard
Air inside the chamber may cause parts or liquid to be pro-
pelled with force. Be careful when opening. Allow the cham-
ber to de-pressurize before removal of the plug.
1. To empty the coolant with the pump upright, do the following:
This method is applicable only for pumps without cooling jackets.
a) Remove the coolant plug.
b) Use a pump to remove the coolant.
2. If it is necessary to separate the drive unit from the hydraulic unit,
then do the following:
a) Carefully open the coolant plugs to relieve any built-up pressure
inside the cooling jacket.
CAUTION: Compressed Gas Hazard
Air inside the chamber may cause parts or liquid to be
propelled with force. Be careful when opening. Allow
the chamber to de-pressurize before removal of the
plug.
b) After venting any built-up pressure in the cooling jacket, re-in-
stall the coolant plugs.
c) Remove the pump housing screws.
d) Remove the drive unit from the pump housing.
NOTICE:
Do not allow the weight of the pump to rest on any portion of
the impeller. The impeller must not be allowed to make contact
with the concrete floor or other hard or rough surfaces.
3. To empty the coolant with the pump in a horizontal position, do the
following:
a) Place the pump horizontally, so that the coolant plug is at the
lowest point of the pump, to ensure that the coolant will drain
completely.
It is important to empty all of the coolant.
b) Place a container under the pump.
c) Remove the coolant plug and empty the coolant.
6.1.2 Fill with coolant
Use oil as coolant. The oil should be a paraffin oil with viscosity close to
ISO VG32. Examples of suitable oil types are the following:
GFK-GFV Series Installation, Operation, and Maintenance Manual
WS001763A
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