Johnson Pump MDR Series - Start up; Routine Control

15
MDR/EN (0909) 1.0
4.3 Start up
• Prime pump
When operating with lift, prime and work out all air.
Note! Pump must not be run without liquid – not even for a short time. When
pumping liquids that are easily flammable, no air is allowed in the system. This
is absolutely necessary in order to avoid that static electricity is generated in
the pump which may cause sevre personal and material damage.
• Check rotation
Open the suction valve and close discharge valve.
Check the rotation of the pump by turning the pump on briefly once. Make sure that
the motor rotates in the correct direction (see rotation arrow on the pump body).
• Starting
When the pump has been started, open the discharge valve slowly and check the
pressure, temperature and flow. Make sure that the piping is properly sealed and that
the pump functions satisfactorily. If not, follow the trouble shooting chart (see section
6.0) or contact yourlocal distributor.
Do not run against closed valve for more than 3 minutes.
When returning a pump for repair, investigation or other reason, it must be cleaned and
wrapped up in a proper way. Documentation stating pumped liquid, operating conditions,
your own opinion of fault/failure reason and your contact person must be included in the
pump package. Also contact the consignee before returning the pump.
4.4 Routine control
• Toavoidproblems,regularlycheckpumpnoise,vibration,capacity,pressuregauge,
motor amperage draw, etc.
• Checkimpellerbearingsforwearafter1to2monthsofoperation.
• Decidethecontrolintervalsaccordingtowearandbearingdiameter.
Diameter of impeller bearing
Replace the impeller at the following inner diameters:
MDR45 7.25 mm
MDR75 10.35 mm
MDR85 10.35 mm
MDR105 15.50 mm
MDR116 15.50 mm
• Iftheimpellerbearingsonlyarereplaced,theyhavetobereamedjointlytothe
following diameters after assembly:
MDR45 7.10 ± 0.05 mm
MDR75/85 10.16 ± 0.04 mm
MDR105/116 15.21 ± 0.04 mm
• Checkwearontheceramicshaftandtheceramicwearplates.
Replace when necessary.
• Ifthepumpwillbestoppedforalongtime,drainandcleantheinteriorofthepump.