Multitec
7. Maintenance / Repair
7.1 General Instructions
The operator is responsible for ensuring that all maintenance,
inspection and installation work is carried out by authorised, duly
qualified staff who are thoroughly familiar with these operating
instructions.
A regular maintenance schedule will help avoid expensive repairs
and contribute to trouble-free, reliable operation of the pump with
a minimum of maintenance expenditure and work.
Work on the unit must only be carried out with the electrical
connections disconnected. Make sure that the pump set
cannot be switched on accidentally.
Pumps handling liquids posing health hazards must be
decontaminated. When draining the medium see to it
that there is no risk to persons or the environment. All
relevant laws must be adhered to.
7.2 Maintenance / Inspection
7.2.1 Supervision of Operation
The pump must run quietly and free from vibrations at all times.
The pump must never be allowed to run dry. Max. ambient
temperature : 40
0
C.
The bearing temperature may exceed ambient temperature by
up to 50
0
C but must never rise above +90
0
C (measured on the
outside of the bearing bracket), see section 7.4.4.1.
Prolonged operation against a closed shut-off element
is not permitted, to prevent the medium handled from
heating up.
Caution : Required minimum flows see 6.2.3.
The shut-off element in the inlet line must not be closed
during pump operation.
The mechanical seal leaks only slightly or invisibly (vapour)
during operation. It is maintenance-free.
Gland packings must leak slightly (individual drops).
Any stand-by pumps installed shall be switched on and then
immediately off again once a week to keep them operational.
Attention shall be paid to the correct functioning of the auxiliary
connections.
7.2.2 Bearings and Lubrication
For the variant with grease lubrication, the rolling element
bearings of the Multitec 32 as well as the rolling element bearing
of the non-drive end of the Multitec 50 and 65 in design C and D
are lubricated for life and do not require any relubrication. In this
case, there are no lubricating nipples on the bearing brackets.
Pump
Depending on the pump version, the rolling element bearings
are grease-lubricated or oil-lubricated.
Grease Quality / Grease Change
The bearings are packed with high-quality lithium-soap grease.
Depending on the size of the pump and the operating hours of
the pump, the rolling element bearings must be re-lubricated or
the grease in the rolling must be replaced.
Speed (1/min)
Size MTC < 1800 2950 3550
32-50-65 10000h 7200h 5700h
100-125 9000h 5700h 3900h
150 8300h 4000h 3100h
If re-lubrication intervals are short, it is recommended to
completely exchange the grease once a year. If this is not the
case, a complete exchange must take place at least every two
years. When doing so, the rolling element bearings must be
dismantled, cleaned and packed with new grease.
In case of unfavourable operating conditions, e.g. high ambient
temperatures and high air humidity, dust-filled air, aggressive
industrial atmospheres etc., the bearings should be controlled
earlier and, if necessary, cleaned and packed with new grease.
Under normal conditions grease-lubricated rolling element
bearings will run for 15,000 operating hours of 2 years. Thereafter,
the bearings have to be dismantled, cleaned and re-packed with
grease. Under unfavourable operating conditions, e.g. high room
temperature, high atmospheric humidity, dust-laden air,
aggressive industrial atmosphere etc., the bearings should be
checked earlier and cleaned and re-lubricated, if required.
Use a high-quality lithium-soap grease, free of resin and acid,
not liable to crumble and with good rust-preventive characteristics.
The grease shall have a penetration number between 2 and 3,
corresponding to a worked penetration between 220 and 295
mm/10. Its drop point must not be below 175
0
C. The bearing
cavities must only be half-filled with grease.
If required, the bearings may be lubricated with greases of other
soap bases. Since greases of differing soap bases must not be
mixed, the bearings must be thoroughly cleaned beforehand. The
re-lubrication intervals required must then be adjusted to the
greases used.
Oil Quality / Oil Change
Quality : HD 20
The first oil change shall be made after 300 operating hours, all
subsequant oil changes after every 3000 operating hours.
Unscrew the plug in the re-fill hole and the drain hole. After the
bearing housing has been drained completely, plug the drain hole
again.
638
Fig. 7.2-1 Oil fill
11
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