8
D3- Shut Down The Pump
Slowly close the shut-off valve in the discharge line.
You may shut down the pump without closing the shut-off valve if there is a device for water hammer
protection on the discharge line or the water hammer is not a considerable level.
Switch off the driver. Ensure the pump set runs down smoothly and quietly to a standstill.
If the set is to remain out of services for a long time close the shut-off valve in the suction pipe. In the event
of frost and/or prolonged standstill, drain the pump or otherwise protect against freezing.
D4- Checks to be Made While The Pump is Running
The pump must run smoothly, quietly and free from vibration at all times.
The pump must never run dry.
Never run the pump for along period against a closed discharge valve (At zero flow).
The bearing temperature may exceed the ambient temperature by up to 50º C. But must never rise above
80º C.
The pump has a mechanical seal, these will experience only minor leakage or no visible leakage during
operation. It is maintenance free. If there is considerable leakage from the seal, that means the seal surfaces
are worn-out and it needs to be replaced. The operation life of the mechanical seal highly depends on the
purity of the water.
Occasionally check the motor current. Stop motor if the amperage is higher than usual; there may be jamming
or friction in the pump. Make the necessary mechanical and electrical checks.
Stand-by pumps should be run for a short time at least once a week to ensure they are in constant readiness
for operation. Check the integrity of auxiliary connections.
E- LUBRICATION
The bearings of motor are always life-time grease lubricated and then maintenance-free.
The bearing temperature may exceed the ambient temperature by up to 50º C. But never rise
above 80º C.
Do not reuse the bearings following disassembly for maintenance purposes.
F- DISASEMBLY, REPAIR AND REASSEMBLY
Before starting work on the pumpset, make sure it is disconnected from the mains and can
not be switched on accidentally.
Follow the safety precaution measures outlined in the "safety instructions" section.
F1- Disassembly
Close all valves in the suctions and discharge lines.
Remove the safety guard (See section O for safety guard).
Detach pump suction and discharge flanges and all auxiliary supply lines (if any), disconnect the pump set
from the piping system.
Dismantle the volute casing (001) from the stuffing box cover (046) (Be careful to keep the stuffing box cover
in place to avoid any mechanical seal trouble).
Unscrew the end nuts (065) of the impeller and take out the impeller (050) and impeller key (210). Use rust
remover solvent if necessary during dismantling.
Take out the spacer sleeve (067).
Pull out the rotating part of the mechanical seal (405).
Dismantle the seal cover (046) and take out the stationary part of the mechanical seal from the seal cover.
Dismantle the motor pedestal (012).
Unscrew the set-screws (380) of the pump shaft (060), or alliens of the rigid coupling (085) depending on
connection type.
Pull off the pump shaft (060) from the motor shaft.
ATTENTION
ATTENTION
